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A band-gap-graded CZTSSe solar cell with 12.3% efficiency

Title
A band-gap-graded CZTSSe solar cell with 12.3% efficiency
Authors
Yang, Kee-JeongSon, Dae-HoSung, Shi-JoonSim, Jun-HyoungKim, Young-IllPark, Si-NaeJeon, Dong-HwanKim, JungSikHwang, Dae-KueJeon, Chan-WookNam, DahyunCheong, HyeonsikKang, Jin-KyuKim, Dae-Hwan
DGIST Authors
Yang, Kee-Jeong; Sung, Shi-Joon; Hwang, Dae-KueKang, Jin-KyuKim, Dae-Hwan
Issue Date
2016
Citation
Journal of Materials Chemistry A, 4(26), 10151-10158
Type
Article
Article Type
Article
Keywords
Absorber MaterialAnnealing ProcessConduction-Band MinimumDefect GenerationDepletion RegionEnergy GapFermi Energy PinningGradingGrain CrystallinityMaximum EfficiencySolar AbsorbersSolar Cells
ISSN
2050-7488
Abstract
Although Cu2ZnSn(S,Se)4 (CZTSSe) has attracted attention as an alternative to CuInGaSe2 (CIGS) as an absorber material in solar cells, its low efficiency is a serious shortcoming preventing its commercialization. To realize a high-efficiency CZTSSe solar cell, improved grain crystallinity, inhibited secondary-phase formation, controlled defect generation, adequate Na content, and band gap grading are required in the absorber layer. Few studies have focused specifically on band gap grading. In this study, a method of using SeS2, a new potential chalcogenization source material, to control the S and Se contents in a CZTSSe absorber and its effects were investigated. Using an appropriate SeS2/Se weight ratio, band gap grading was realized within the depletion region. By increasing the value of VOC through band gap grading in the depletion region, a record VOC deficit of 0.576 V was achieved. Furthermore, the possibility of enhancing JSC through the formation of a type-inverted n-type phase at the absorber surface in response to an appropriate alignment of the conduction-band minimum energy level and the Fermi energy pinning level is discussed. By introducing the chalcogenization source material SeS2 during the annealing process, CZTSSe solar cells with a maximum efficiency of 12.3% were obtained. © The Royal Society of Chemistry 2016.
URI
http://hdl.handle.net/20.500.11750/5143
DOI
10.1039/c6ta01558a
Publisher
Royal Society of Chemistry
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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