研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

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In Situ Fabrication of Nanoepitaxial TiO<inf>2</inf> Protection Layer on Si Substrate: Hole Chemical Conduction Instead of Tunneling Effect 査読有り

Gao L., Li Q., Chen H., Hayase S., Ma T.

Solar RRL 1 ( 8 ) 2017年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The efficiency of the Si photoanode of photoelectrochemical (PEC) cells in solar water splitting undergoes poor charge separation and transfer process through multiple interfaces. This phenomenon occurs mainly due to a recombination induced by interfacial defects and quantum tunneling effect caused by SiO2 layer insulation. In this study, the in situ fabrication of nanoepitaxial TiO2 on Si substrates in constructing TiO2/Si heterojunction is performed by combining a self-assembly process and a hydrothermal method. The nanoepitaxial growth process is conducted because of the crystal type and lattice matching between anatase-type TiO2 and Si substrate. Studies have shown that a minimal insulator SiO2 layer is left in the heterogeneous interface, which is contacted by a chemical bond. Therefore, a nearly defect-free heterojunction without a SiO2 insulator layer is obtained. After depositing the common catalyst Ni, a large saturated current density of Ni/TiO2/Si photoanode is achieved. This excellent property is caused by fast carrier transfer through the heterogeneous interface, resulting in the efficiency of injection and separation of fast carriers. In comparison with the traditional method, (i.e., the TiO2 protection film deposited by atom layer deposition (ALD)), the Ni/TiO2/Si photoanode fabricated by nanoepitaxial growth has a significantly lower onset potential and remarkably higher current density, which is 11-fold at 1.23 V bias potential. Results confirm that the nanoepitaxy of TiO2 on Si can improve the stability of Si substrates in an alkaline solution for more than 24 h.

DOI： 10.1002/solr.201700064

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Metal-organic framework derived hierarchical porous TiO2 nanopills as a super stable anode for Na-ion batteries 査読有り

Li H., Zhang Z., Huang X., Lan T., Wei M., Ma T.

Journal of Energy Chemistry 26 ( 4 ) 667 - 672 2017年07月

Low-temperature processed compact layer for perovskite solar cells with negligible hysteresis 査読有り

Wang L., Liu F., Liu F., Liu T., Cai X., Wang G., Ma T., Ma T., Jiang C.

Electrochimica Acta 235 640 - 645 2017年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Elsevier LtdHybrid organic/inorganic perovskite solar cells (PVSCs) are promising alternatives to traditional photovoltaic devices because of their low cost, high power conversion efficiency, and simple production process. Therefore, achieving a low-temperature and high-efficiency procedure is necessary to realize the large-scale production of PVSCs. This study developed a facile low-temperature process (70 °C) for the synthesis of anatase TiO2 thin films on the FTO substrate through an in situ growth method. The as-synthesized anatase TiO2 thin films were applied on efficient compact layers of all low-temperature (sub-100 °C)-processed PVSCs. Under optimization, the achieved low-temperature PVSC device exhibited a champion conversion efficiency of up to 10.33%, with excellent repeatability and negligible hysteresis. Results revealed that fast electron extraction and transfer between perovskite and TiO2 films and effective suppression of charge recombination are the main attributes for the excellent performance of the PVSC device. This work provides a new alternative to achieve low-temperature and high-efficiency photovoltaic devices.

DOI： 10.1016/j.electacta.2017.03.145

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3-D honeycomb NiCo<inf>2</inf>S<inf>4</inf>with high electrochemical performance used for supercapacitor electrodes 査読有り

Zhang Z., Huang X., Li H., Zhao Y., Ma T.

Applied Surface Science 400 238 - 244 2017年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V. A new nanostructured 3-D honeycomb NiCo 2 S 4 (NC-1) has been successfully prepared by a simple hydrothermal method assisted sulfuration procedure. The morphology of the 3-D honeycomb was investigated by FESEM and TEM, and the results suggest the NC-1 has a highly porous structure. Its chemical composition was characterized by XRD and XPS and the results indicate that the NC-1 is the pure phase of NiCo 2 S 4 . In order to study the effect of morphology on the electrochemical performance, we have also prepared needle-, flake- and petal-like nanostructured NiCo 2 S 4 on Ni foam. When they were used as supercapacitor electrodes, the NC-1 exhibited the highest electrochemical performance among these four kinds of electrodes. Its maximum specific capacity was over 14 mAh cm −2 at 1 mA m −2 and it still yielded 7.96 mAh cm −2 even at 50 mA cm −2 . The NC-1 remained 99.64% of the initial capacity after the long-term test of 1000 cycles. Consequently, the NC-1 has the promising potential as an energy storage system in the future and it can also be used as an ideal substrate for other active materials involving a faradaic process.

DOI： 10.1016/j.apsusc.2016.12.206

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Transparent Conductive Oxide Layer and Hole Selective Layer Free Back-Contacted Hybrid Perovskite Solar Cell 査読有り

Hu Z., Kapil G., Shimazaki H., Pandey S., Ma T., Hayase S.

Journal of Physical Chemistry C 121 ( 8 ) 4214 - 4219 2017年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 American Chemical Society.Back-contacted architectures have been under intensive investigation for that transparent conductive oxide (TCO) less solar cells (SCs) can be easily realized which avoid the transmission loss of light caused by TCO, typically comprised in conventional solar cells. Here, network-like porous Ti was first utilized as the back-contacted electrode, and a new design allows for a novel back-contacted hybrid perovskite SC without TCO and hole selective layer, which shows a power output of 3.88% with long-term stability. In addition, it avoids limit available collection area of electrodes in the recent reported interdigitated electrode (IDE) based back-contacted TCO-less SCs. (Graph Presented).

DOI： 10.1021/acs.jpcc.7b00760

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Advances and Obstacles on Perovskite Solar Cell Research from Material Properties to Photovoltaic Function

Bisquert J., Qi Y., Ma T., Yan Y.

ACS Energy Letters ( ACS Energy Letters ) 2 ( 2 ) 520 - 523 2017年02月

One-Stage Method for Fabricating Superhydrophobic Stainless Steel Surface and Its Anti-Corrosion Performance 査読有り

Gao L., Yang S., Yang H., Ma T.

Advanced Engineering Materials 19 ( 2 ) 2017年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim One-stage preparation of superhydrophobic stainless steel surface is achieved by combining chemical etching and assembly. The contact angle of the prepared surface reaches as high as 175°. The correlative mechanism between the contact angle and surface morphology is elucidated from the dynamics perspective by controlling reaction conditions. The optimum reaction conditions are then determined. Experimental results demonstrate that the stainless steel surface achieves optimal water contact angle upon the formation of the “honeycomb” 3D network structure. Electrochemical corrosion test shows that the prepared superhydrophobic stainless steel surface possesses 16 times higher corrosion resistance than common stainless steel surface.

DOI： 10.1002/adem.201600511

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A novel composite of W<inf>18</inf>O<inf>49</inf> nanorods on reduced graphene oxide sheets based on in situ synthesis and catalytic performance for oxygen reduction reaction 査読有り

Guo J., Guo J., Shi Y., Zhou H., Wang X., Ma T., Ma T.

RSC Advances 7 ( 4 ) 2051 - 2057 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry.A novel composite catalyst based on in situ synthesis of W1+49 nanorods on reduced graphene oxide sheets was successfully fabricated through a one-pot solvothermal route. The as-prepared W18O49-reduced graphene oxide (rGO) composite has been systematically characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman microscopy, X-ray photoelectron spectra, and a rotating disk electrode. Compared to W18O49 nanorods or reduced graphene oxide alone, or their physical mixture, the composite catalyst exhibited unexpectedly high ORR activity with a more positive onset-potential (close to that of Pt/C) and a higher kinetic current density (JK), which is mainly attributed to the nanorod morphology, surface oxygen vacancies of W18O49, and strong coupling interaction between the W18O49 nanorods and reduced graphene oxide sheets. These results raise the possibility of developing low-cost and efficient ORR electrocatalysts.

DOI： 10.1039/c6ra27031j

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W(Nb)O<inf>x</inf>-based efficient flexible perovskite solar cells: From material optimization to working principle 査読有り

Wang K., Shi Y., Gao L., Chi R., Shi K., Guo B., Zhao L., Ma T., Ma T.

Nano Energy 31 424 - 431 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016Flexible perovskite solar cell (PSC) using plastic substrate is one of the most focal points in the studies of thin-film solar cells. Low-temperature preparation of suitable electron selective layer (ESL) is the key issue in the fabrication of flexible PSCs. In this work, amorphous niobium-modified tungsten oxide W(Nb)Ox was prepared as ESL for efficient flexible PSC. Modification using Nb5+ improved the electron transport of WOx-based ESL by enhancing donor density, reducing interfacial depletion width, and minimizing trap states in the ESL. Consequently, photovoltaic performance of the simple planar flexible PSCs was improved, and high PCEs of 15.65% and 13.14% were obtained when ESLs were fabricated at 120 °C and room temperature, respectively. In addition, the effect of ESL thickness on the hysteresis behavior of PSCs was carefully analyzed. A capacitance CE across the ESL in the ITO/ESL/perovskite structure was proposed. This capacitance could well indicate the effect of ESL thickness on hysteresis behavior. The proposed modification strategy and mechanism is expected to facilitate the development of novel and advanced functional materials.

DOI： 10.1016/j.nanoen.2016.11.054

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Transparent conductive oxide-less dye-sensitized solar cells consisting of dye-cocktail and cobalt based redox electrolyte 査読有り

Molla M., Baranwal A., Pandey S., Ma T., Hayase S.

Journal of Nanoscience and Nanotechnology 17 ( 7 ) 4748 - 4754 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2017 American Scientific Publishers. All rights reserved.Thin Ti-metal protected stainless steel metal mesh coated with mesoporous TiO2 as flexible photoanode has been used to fabricate back contact transparent conductive oxide-less dye-sensitized solar cells. TiO2 nanoparticle having a particle size of 15-20 nm sensitized with dye cocktail of two indoline dyes D-205 and D-131 were first utilized owing to their complementary light harvesting properties. Short-circuit photocurrent density (Jsc) for the dye cocktail combination of D-205 and D-131 (1:1) was found to be increased due to the increased photon harvesting in the 400-500 nm mainly associated with the contribution from D-131 dye. In addition, the electron recombination was suppressed when dye cocktail was employed as confirmed by the dark current measurement leading to higher open-circuit voltage (Voc). The enhanced Jsc accompanied with increased Voc resulted in to an improved efficiency of 3.59% for this cocktail combination. To enhance the efficiency even further, we have utilized TiO2 nanoparticle having a larger particle size of 30 nm facilitating the mass transport of the bulky [Co(bpy)3]3+/2+ redox species. In order to enhance the photon harvesting window TiO2 nanoparticles were sensitized with porphyrin dye (YD2-o-C8) along with different dye cocktail combinations with another complementary dye (Y123). Utilization of a dye cocktail of YD2-o-C8 and Y123 (4:1) led to improved photoconversion efficiency of 5.25% under simulated solar irradiation.

DOI： 10.1166/jnn.2017.13746

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Transparent conductive oxide-less back contact dye-sensitized solar cells using flat titanium sheet with microholes for photoanode fabrication 査読有り

Hayat A., Hayat A., Baranwal A., Nakamura M., Shigeki F., Pandey S., Ma T., Hayase S.

Journal of Photonics for Energy 7 ( 1 ) 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).A flat titanium sheet with microholes (FTS-MH) has been utilized to fabricate transparent conductive oxide-less dye-sensitized solar cells (TCO-less DSSCs) in back contact device architecture. Utilization of FTS-MH to fabricate a TCO-less photoanode offers several advantages in terms of simplicity and ease of fabrication as compared with the TCO-less DSSCs structure reported previously. Hydrogen peroxide (H2O2) surface treatments on FTS-MH have shown important factors to enhance the photoanode properties. H2O2 surface treatment is able to change the surface morphology of FTS-MH, and the created anatase titanium dioxide (TiO2) nanostructures increase the surface contact between the FTS-MH and the coated mesoporous TiO2. Electrochemical impedance investigations reveled that improvements of the FTS-MH/TiO2 and TiO2/dye/electrolyte interface led to hampered charge recombination resulting in enhancement of both short-circuit current density and open-circuit voltage, respectively. Even after removal of both TCO layers, our complete TCO-less DSSCs exhibited a power conversion efficiency of 7.25% under simulated solar irradiation.

DOI： 10.1117/1.JPE.7.015501

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Current advancements in material research and techniques focusing on lead-free perovskite solar cells

Zhang C., Gao L., Hayase S., Ma T.

Chemistry Letters ( Chemistry Letters ) 46 ( 9 ) 1276 - 1284 2017年01月

記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

© 2017 The Chemical Society of Japan. Organicinorganic lead halide perovskite solar cells (PSCs) recently achieved a photo-to-electricity conversion efficiency (PCE) of 22.1%. They drew much attention as promising photovoltaic devices. However, the Pb-based PSCs face great challenges for commercial and industrial applications due to the instability and the toxicity of perovskite materials. Herein, we summarize the current development of various types of Pb-free perovskites, such as the Sn-, Bi-, Ge-, Sr-, and Cu-based perovskites and their devices. In addition, we will address some remaining issues and prospects of the Pb-free PSCs.

DOI： 10.1246/cl.170345

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Effect of lead-free (CH<inf>3</inf>NH<inf>3</inf>)<inf>3</inf>Bi<inf>2</inf>I<inf>9</inf>perovskite addition on spectrum absorption and enhanced photovoltaic performance of bismuth triiodide solar cells 査読有り

Lan C., Luo J., Zhao S., Zhang C., Liu W., Hayase S., Ma T.

Journal of Alloys and Compounds 701 834 - 840 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

ï¿½ 2017 Elsevier B.V. Active composite layers of bismuth triiodide (BiI 3 ) and lead-free (CH 3 NH 3 ) 3 Bi 2 I 9 (MBI) perovskite were prepared using a simple chemical solution method under ambient conditions for thin-film solar cells. Results of X-ray diffraction and scanning electron microscopy indicated that the crystallization and surface morphologies of the composite films varied with perovskite contents. Multi-absorption was observed in the composite films due to the bandgap difference between BiI 3 and MBI perovskite. Moreover, band bending at the BiI 3 -perovskite interfaces resulted in the realignment of energy levels in the composite films, and this phenomenon was beneficial to the efficient injection of excited electrons from the active layers into the TiO 2 layers. Accordingly, due to the optimized crystallization and realigned energy level, when 20% of MBI perovskite was introduced into the active layers, the open-circuit voltage obviously increased from 0.44 V to 0.57 V in the (BiI 3 ) 0.8 (MBI) 0.2 composites solar cells, enhancing their power conversion efficiency by 67% compared with that in pure BiI 3 solar cell. This study developed a new route for designing more efficient lead-free solar cells.

DOI： 10.1016/j.jallcom.2017.01.169

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Novel fabrication of Ni<inf>3</inf>S<inf>2</inf>/MnS composite as high performance supercapacitor electrode 査読有り

Huang X., Zhang Z., Li H., Zhao Y., Wang H., Ma T.

Journal of Alloys and Compounds 722 662 - 668 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 A Ni 3 S 2 /MnS composite with unique 3-D morphology was synthesized by a novel method consisting of etching and pre-oxidation of Ni foam followed by in situ hydrothermal method. The etching process created a flower-like structure with the Ni foam which was not only used as a substrate but also providing Ni source for subsequent growth of Ni 3 S 2 and Ni 3 S 2 /MnS composite. The synthesized material showed hierarchical structure consisting of porous Ni 3 S 2 which was coated with vertically grown MnS nanorods. The superior morphology enables the access of more active sites in the electrochemical charge/discharge process. In the meantime, the charges involved in redox reaction can be effectively transferred via Ni 3 S 2 with relatively high conductivity to Nickel foam substrate, which improved the availability of MnS. Therefore, when the Ni 3 S 2 /MnS composite was used as a supercapacitor electrode, it showed a remarkable electrochemical performance of 6.70 mAh cm −2 which is over two-fold higher than that of the Ni 3 S 2 (3.15 mAh cm −2 ) and MnS (2.34 mAh cm −2 ) at current density of 2 mA cm −2 , respectively. Impressively, the specific capacity of Ni 3 S 2 /MnS still retained 6.41 mAh cm −2 with the capacity retention of 96.5% even after 1000 cycles. Further, the electrochemical properties of asymmetric supercapacitors (ACSs) deliver a maximum energy density of 0.47 mWh cm −2 at power density of 10 mW cm −2 , together with 82.1% retention after long-term test.

DOI： 10.1016/j.jallcom.2017.06.166

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In situ fabrication of integrated electrode of perovskite solar cells 査読有り

Gao L., Yang S., Li Y., Zhao E., Wang L., Fu C., Hayase S., Ma T.

Chemistry Letters 46 ( 11 ) 1687 - 1690 2017年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017 The Chemical Society of Japan. An integrated electrode has been in situ fabricated on a titanium substrate by a simple thermal oxidation method. The integrated electrodes can replace glass substrates, fluorine-doped tin oxide (FTO), and TiO 2 compact and mesoporous layers in conventional perovskite solar cells (PSCs) with bilayer configuration. Under AM1.5 illumination, photon-to-electricity conversion efficiency (PCE) of the fabricated PSCs is 9.92%, which is higher than that of PSCs with bilayer configuration. Interestingly, photoluminescence (PL) measurements show a lower charge recombination in the integrated electrodes than normal TiO 2 electrodes fabricated layer by layer, thereby suggesting that photoinduced electrons in integrated electrodes can be more efficiently extracted. We also found that our PSCs have high conductivity and excellent stability. Therefore, the developed technique is suitable for fabricating large area PSCs.

DOI： 10.1246/cl.170804

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Pinhole-Free Perovskite Films by Methylamine Iodide Solution-Assisted Repair for High-Efficiency Photovoltaics under Ambient Conditions 査読有り

Wang L., Liu F., Liu F., Liu T., Wang J., Cai X., Wang G., Ma T., Ma T., Jiang C.

ACS Applied Materials and Interfaces 8 ( 45 ) 30920 - 30925 2016年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 American Chemical Society.In this study, we demonstrate a simple strategy for obtaining pinhole-free, homogeneous, well-crystallized perovskite films under ambient conditions. The preparation of perovskite film with high light-harvesting efficiency and long carrier lifetime is verified. By applying this film in TiO2-based perovskite solar cells (PVSCs), we achieved a high power-conversion efficiency (PCE) of 13.07%, which is doubled with respect to that of the PVSC not subjected to the same improvement procedure (6.54%). High open-circuit photovoltage, photocurrent density, and fill factor are the main contributions to the high PCE that results from low trap density and high recombination resistance of the resultant perovskite films. This work paves a new means for fabricating high-performance perovskite films and PVSC devices in an ambient atmosphere.

DOI： 10.1021/acsami.6b09978

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Concentration gradient controlled growth of large-grain CH3NH3PbI3 films and enhanced photovoltaic performance of solar cells in ambient conditions. 査読有り

Chunfeng Lan, Shuai Zhao, Chu Zhang, Weiguo Liu, Shuzi Hayase, Tingli Ma

CrystEngComm 18 ( 48 ) 9243 - 9251 2016年11月

Facile synthesis and characterization of sulfur doped low bandgap bismuth based perovskites by soluble precursor route 査読有り

Vigneshwaran M., Ohta T., Iikubo S., Kapil G., Ripolles T., Ogomi Y., Ma T., Pandey S., Shen Q., Toyoda T., Yoshino K., Minemoto T., Hayase S.

Chemistry of Materials 28 ( 18 ) 6436 - 6440 2016年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2016 American Chemical Society.The bismuth based perovskite with the structure (CH3NH3)3Bi2I9 (MBI) is rapidly emerging as eco-friendly and stable semiconducting material as a substitute for the lead halide perovskites. A relatively higher bandgap of MBI (about 2.1 eV) has been found to be a bottleneck in realizing the high photovoltaic performance similar to that of lead halide based perovskites. We demonstrate the bandgap engineering of novel bismuth based perovskites obtained by in situ sulfur doping of MBI via the thermal decomposition of Bi(xt)3 (xt = ethyl xanthate) precursor. Colors of the obtained films clearly changed from orange to black when annealed from 80 to 120 °C. Formation of sulfur doped MA3Bi2I9 was confirmed by XRD and the presence of sulfur was confirmed through XPS. In this work, obtained sulfur doped bismuth perovskites exhibited a bandgap of 1.45 eV which is even lower than that of most commonly used lead halide perovskites. Hall-Effect measurements showed that the carrier concentration and mobility are much higher as compared to that of undoped MA3Bi2I9.

DOI： 10.1021/acs.chemmater.6b02315

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Strategic improvement of the long-term stability of perovskite materials and perovskite solar cells

Tingting Xu, Lixin Chen, Zhanhu Guo, and Tingli Ma

Physical Chemistry Chemical Physics ( Physical Chemistry Chemical Physics ) 18 27026 - 27050 2016年09月

Strategic improvement of the long-term stability of perovskite materials and perovskite solar cells 査読有り

Tingting Xu, Lixin Chen, Zhanhu Guo, Tingli Ma

Physical Chemistry Chemical Physics 39 ( 18 ) 27026 - 27050 2016年09月

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