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Influence of Processing Conditions on the Performance of Cu 2 ZnSnS 4 Nanocrystal Solar Cells
Author(s) -
Kida Tetsuya,
Horita Keisuke,
Suehiro Satoshi,
Yuasa Masayosh,
Quitain Armando T.,
Tanaka Tooru,
Fujita Katsuhiko,
Ishiwata Yoichi,
Shimanoe Kengo
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201500004
Subject(s) - photocurrent , oleylamine , materials science , solar cell , nanocrystal , energy conversion efficiency , fabrication , annealing (glass) , chemical engineering , optoelectronics , nanotechnology , metallurgy , medicine , alternative medicine , pathology , engineering
Quaternary Cu 2 ZnSnS 4 is a promising solar cell material because of its narrow band gap, high light absorption coefficient, and low cost. It is known that the composition of Cu 2 ZnSnS 4 largely influences the solar cell performance. Here, to study the composition dependent properties of Cu 2 ZnSnS 4 NCs as a solar cell material, we synthesized oleylamine‐capped Cu 2 ZnSnS 4 NCs with different compositions by a one‐pot solution process, and fabricated solar cells with a ITO/ZnO/CdS/Cu 2 ZnSnS 4 /Au structure, and photoelectrochemical cells. A photovoltaic device using Cu 2 ZnSnS 4 NCs with Cu/ (Zn + Sn)=0.87 showed the best performance among the devices tested. To improve the performance, the NC film fabrication processes were modified. We found that ligand stripping with BF 3 :OEt 2 and the subsequent annealing at 250 °C in N 2 improved the power conversion efficiency from 0.06 to 0.14 %, most likely due to efficient stripping of surface insulating organic layers. The photocurrent response of a photoelectrochemical cell using the Cu 2 ZnSnS 4 NCs deposited on a ITO substrate was also improved by the modified NC film fabrication processes.