A 9% efficiency of flexible Mo-foil-based Cu2ZnSn(S, Se)4 solar cells by improving CdS buffer layer and heterojunction interface

doi:10.1088/1674-1056/abb7fe

Abstract Flexible Cu₂ZnSn(S,Se)₄ (CZTSSe) solar cells show great potential applications due to low-cost, nontoxicity, and stability. The device performances under an especial open circuit voltage (V_OC) are limited by the defect recombination of CZTSSe/CdS heterojunction interface. We improve the deposition technique to obtain compact CdS layers without any pinholes for flexible CZTSSe solar cells on Mo foils. The efficiency of the device is improved from 5.7% to 6.86% by highquality junction interface. Furthermore, aiming at the S loss of CdS film, the S source concentration in deposition process is investigated to passivate the defects and improve the CdS film quality. The flexible Mo-foil-based CZTSSe solar cells are obtained to possess a 9.05% efficiency with a V_OC of 0.44 V at an optimized S source concentration of 0.68 mol/L. Systematic physical measurements indicate that the S source control can effectively suppress the interface recombination and reduce the V_OC deficit. For the CZTSSe device bending characteristics, the device efficiency is almost constant after 1000 bends, manifesting that the CZTSSe device has an excellent mechanical flexibility. The effective improvement strategy of CdS deposition is expected to provide a new perspective for promoting the conversion efficiency of CZTSSe solar cells.

Keywords: flexible solar cells CdS deposition heterojunction interface defect passivation

Received: 11 May 2020
Revised: 28 August 2020
Accepted manuscript online: 14 September 2020

PACS:	88.40.hj	(Efficiency and performance of solar cells)
	88.40.jn	(Thin film Cu-based I-III-VI2 solar cells)
	81.10.Dn	(Growth from solutions)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 62074037, 61574038, 51961165108, and 51972332), the Natural Science Foundation of Fujian Province, China (Grant No. 2017J01503), the Education and Scientific Research Project of Fujian Province, China (Grant No. JAT190010), the Open Project Program of the State Key Laboratory of Photocatalysis on Energy and Environment, China (Grant No. SKLPEE-202011), and Fuzhou University, China.

Corresponding Authors: ^†These authors contributed equally to this work. ^‡Corresponding author. E-mail: sycheng@fzu.edu.cn ^§Corresponding author. E-mail: denghui@fzu.edu.cn

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Quan-Zhen Sun(孙全震), Hong-Jie Jia(贾宏杰), Shu-Ying Cheng(程树英), Hui Deng(邓辉)\ccclink, Qiong Yan(严琼), Bi-Wen Duan(段碧雯), Cai-Xia Zhang(张彩霞), Qiao Zheng(郑巧), Zhi-Yuan Yang(杨志远), Yan-Hong Luo(罗艳红), Qing-Bo Men(孟庆波), and Shu-Juan Huang(黄淑娟) A 9% efficiency of flexible Mo-foil-based Cu₂ZnSn(S, Se)₄ solar cells by improving CdS buffer layer and heterojunction interface 2020 Chin. Phys. B 29 128801

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1. Supporting Information.pdf(953KB)

[1]	Micro-mechanism study of the effect of Cd-free buffer layers ZnXO (X=Mg/Sn) on the performance of flexible Cu₂ZnSn(S, Se)⁴ solar cell Caixia Zhang(张彩霞), Yaling Li(李雅玲), Beibei Lin(林蓓蓓), Jianlong Tang(唐建龙), Quanzhen Sun(孙全震), Weihao Xie(谢暐昊), Hui Deng(邓辉), Qiao Zheng(郑巧), and Shuying Cheng(程树英). Chin. Phys. B, 2023, 32(2): 028801.
[2]	Dramatic reduction in dark current of β-Ga₂O₃ ultraviolet photodectors via β-(Al_0.25Ga_0.75)₂O₃ surface passivation Jian-Ying Yue(岳建英), Xue-Qiang Ji(季学强), Shan Li(李山), Xiao-Hui Qi(岐晓辉), Pei-Gang Li(李培刚), Zhen-Ping Wu(吴真平), and Wei-Hua Tang(唐为华). Chin. Phys. B, 2023, 32(1): 016701.
[3]	Recent advances of interface engineering in inverted perovskite solar cells Shiqi Yu(余诗琪), Zhuang Xiong(熊壮), Zhenhan Wang(王振涵), Haitao Zhou(周海涛), Fei Ma(马飞), Zihan Qu(瞿子涵), Yang Zhao(赵洋), Xinbo Chu(楚新波), and Jingbi You(游经碧). Chin. Phys. B, 2022, 31(10): 107307.

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A 9% efficiency of flexible Mo-foil-based Cu2ZnSn(S, Se)4 solar cells by improving CdS buffer layer and heterojunction interface

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A 9% efficiency of flexible Mo-foil-based Cu₂ZnSn(S, Se)₄ solar cells by improving CdS buffer layer and heterojunction interface