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Heterojunction interface passivation of Cu2ZnSnS4 solar cells by uv-ozone treatment

Heterojunction interface passivation of Cu2ZnSnS4 solar cell...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Shengli Zhang Yi Zhang Suhuai Wei Baolai Liang Tuquabo Tesfamichael Hongxia Wang School of Chemistry Physics and Mechanical EngineeringScience and Engineering FacultyQueensland University of Technology Institute of Photoelectronic Thin Film Devices and Technology Nankai University

Kesterite CuZnSnS(CZTS) is an attractive photovoltaic material for application in thin film solar cells. However, binary and/or ternary phases are always unavoidable in the final CZTS products due to the narrow formation chemical potential of the material . To remove these secondary phases at the surface, preferential chemical etching has been widely used , such as the solution of KCN, HCl acid, deionized(DI) water, etc. Herein, an uv-ozone treatment was introduced to passivate the surface of CZTS, where defects(such as vacancy site, absorbed atoms or dangling bonds) might be formed after the HCl acid etching. With this process, the short circuit current density(Jsc) was greatly boosted from 11.70 mA/cm to 18.34 mA/cm and thus the efficiency from 3.18% to above 5%. The surface chemical evolution was revealed through X-ray photoelectron spectroscopy(XPS) measurement, in which a Sn-O rich surface was found. Further, band alignment diagrams were proposed to explain this passivation phenomenon based on ultra-violet photoelectron spectroscopy(UPS) results, where an ultra-thin tunneling layer of CZT(S,O) or SnO was acting the defects passivation role. Photoluminescence(PL) spectroscopy also verifies the reduction of non-radiative recombination loss.

关键词： surface passivation heterojunction interface uv-ozone treatment

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Surface-Modified Metallic Ti3C2Tx MXene as Electron Transport Layer for Planar Heterojunction Perovskite Solar Cells

Surface-Modified Metallic Ti3C2Tx MXene as Electron Transpor...

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第七届新型太阳能电池材料科学与技术学术研讨会

作者： Lin Yang Chunxiang Dall’Agnese Yohan Dall’Agnese Gang Chen Yu Gao Yoshitaka Sanehira Ajay Kumar Jena Xiao-Feng Wang Yury Gogotsi Tsutomu Miyasaka Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University

MXenes are a large and rapidly expanding family of two-dimensional(2 D) materials which,owing to their unique optoelectronic properties and tunable surface termination,find a wide range of applications including energy storage and energy *** this work,TiCT MXene nanosheets are applied as a novel type of electron transport layer(ETL) in low-temperature processed planar-structured perovskite solar cells(PSCs).Interestingly,simple uv-ozone treatment of the metallic TiCT that increases the surface Ti-O bonds without any change in its bulk properties like high electron mobility improves its suitability as an *** electron transfer and suppressed recombination at the ETL/perovskite interface results in augmentation of the power conversion efficiency(PCE) from 5.00% in the case of TiCT without uv-ozone treatment to the champion PCE of 17.17%,achieved using the TiCT film after 30 minutes of uv-ozone *** the first report on the use of pure MXene layer as an ETL in PSCs,this work shows great potential of MXenes to be used in PSCs and displays their promises for applications in photovoltaic technology in general.

关键词： uv-ozone treatment Ti3C2Tx MXene electron transport layers perovskite solar cells

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