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Chin. Phys. B, 2018, Vol. 27(1): 016402    DOI: 10.1088/1674-1056/27/1/016402
Special Issue: SPECIAL TOPIC — New generation solar cells
SPECIAL TOPIC—New generation solar cells Prev   Next  

Regulation of Zn/Sn ratio in kesterite absorbers to boost 10% efficiency of Cu2ZnSn(S, Se)4 solar cells

Xue Min(闵雪)1,2, Jiangjian Shi(石将建)1,2, Linbao Guo(郭林宝)1,2, Qing Yu(于晴)1,2, Pengpeng Zhang(张朋朋)1,2, Qingwen Tian(田庆文)3, Dongmei Li(李冬梅)1,2, Yanhong Luo(罗艳红)1,2, Huijue Wu(吴会觉)1,2, Qingbo Meng(孟庆波)1,2, Sixin Wu(武四新)3
1 Key Laboratory for Renewable Energy(CAS), Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 The Key Laboratory for Special Functional Materials of MOE, Henan University, Kaifeng 475004, China
Abstract  The Zn/Sn ratio in Cu2ZnSn(S, Se)4 (CZTSSe) films has been regulated to control the composition-related phase, defect, and photoelectric properties for high performance kesterite solar cells. It is found that the increase in the Zn/Sn ratio can slightly narrow the energy band gap to extend the light absorption range and improve the photocurrent. Optimal Zn/Sn ratio of 1.39 in CZTSSe film is obtained with the least secondary phase, the lowest defect density, and the longest charge recombination lifetime. Up to 10.1% photoelectric conversion efficiency has been achieved by this composition regulation.
Keywords:  CZTSSe solar cell      composition regulation      defect suppression  
Received:  17 October 2017      Revised:  13 November 2017      Accepted manuscript online: 
PACS:  64.75.St (Phase separation and segregation in thin films)  
  72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)  
  78.20.-e (Optical properties of bulk materials and thin films)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51627803, 51402348, 51421002, 51372270, and 51372272) and the Knowledge Innovation Program of the Chinese Academy of Sciences.
Corresponding Authors:  Qingbo Meng, Sixin Wu     E-mail:  qbmeng@iphy.ac.cn;wusixin@henu.edu.cn

Cite this article: 

Xue Min(闵雪), Jiangjian Shi(石将建), Linbao Guo(郭林宝), Qing Yu(于晴), Pengpeng Zhang(张朋朋), Qingwen Tian(田庆文), Dongmei Li(李冬梅), Yanhong Luo(罗艳红), Huijue Wu(吴会觉), Qingbo Meng(孟庆波), Sixin Wu(武四新) Regulation of Zn/Sn ratio in kesterite absorbers to boost 10% efficiency of Cu2ZnSn(S, Se)4 solar cells 2018 Chin. Phys. B 27 016402

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