Device simulation of lead-free CH3NH3SnI3 perovskite solar cells with high efficiency

doi:10.1088/1674-1056/25/10/108802

中国物理B ›› 2016, Vol. 25 ›› Issue (10): 108802-108802.doi: 10.1088/1674-1056/25/10/108802

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency

Hui-Jing Du(杜会静), Wei-Chao Wang(王韦超), Jian-Zhuo Zhu(朱键卓)

College of Science, Yanshan University, Qinhuangdao 066004, China

收稿日期:2016-03-28 修回日期:2016-06-21 出版日期:2016-10-05 发布日期:2016-10-05
通讯作者: Jian-Zhuo Zhu E-mail:zhujz@ysu.edu.cn
基金资助:
Project supported by the Graduate Student Education Teaching Reform Project, China (Grant No. JG201512) and the Young Teachers Research Project of Yanshan University, China (Grant No. 13LGB028).

Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency

Hui-Jing Du(杜会静), Wei-Chao Wang(王韦超), Jian-Zhuo Zhu(朱键卓)

College of Science, Yanshan University, Qinhuangdao 066004, China

Received:2016-03-28 Revised:2016-06-21 Online:2016-10-05 Published:2016-10-05
Contact: Jian-Zhuo Zhu E-mail:zhujz@ysu.edu.cn
Supported by:
Project supported by the Graduate Student Education Teaching Reform Project, China (Grant No. JG201512) and the Young Teachers Research Project of Yanshan University, China (Grant No. 13LGB028).

摘要/Abstract

摘要： The lead-free perovskite solar cells (PSCs) have drawn a great deal of research interest due to the Pb toxicity of the lead halide perovskite. CH₃NH₃SnI₃ is a viable alternative to CH₃NH₃PbX₃, because it has a narrower band gap of 1.3 eV and a wider visible absorption spectrum than the lead halide perovskite. The progress of fabricating tin iodide PSCs with good stability has stimulated the studies of these CH₃NH₃SnI₃ based cells greatly. In the paper, we study the influences of various parameters on the solar cell performance through theoretical analysis and device simulation. It is found in the simulation that the solar cell performance can be improved to some extent by adjusting the doping concentration of the perovskite absorption layer and the electron affinity of the buffer and HTM, while the reduction of the defect density of the perovskite absorption layer significantly improves the cell performance. By further optimizing the parameters of the doping concentration (1.3×10¹⁶ cm^-3) and the defect density (1×10¹⁵ cm^-3) of perovskite absorption layer, and the electron affinity of buffer (4.0 eV) and HTM (2.6 eV), we finally obtain some encouraging results of the J_sc of 31.59 mA/cm², V_oc of 0.92 V, FF of 79.99%, and PCE of 23.36%. The results show that the lead-free CH₃NH₃SnI₃ PSC is a potential environmentally friendly solar cell with high efficiency. Improving the Sn²⁺ stability and reducing the defect density of CH₃NH₃SnI₃ are key issues for the future research, which can be solved by improving the fabrication and encapsulation process of the cell.

关键词: CH₃NH₃SnI₃, perovskite solar cells, device simulation, high efficiency

Abstract: The lead-free perovskite solar cells (PSCs) have drawn a great deal of research interest due to the Pb toxicity of the lead halide perovskite. CH₃NH₃SnI₃ is a viable alternative to CH₃NH₃PbX₃, because it has a narrower band gap of 1.3 eV and a wider visible absorption spectrum than the lead halide perovskite. The progress of fabricating tin iodide PSCs with good stability has stimulated the studies of these CH₃NH₃SnI₃ based cells greatly. In the paper, we study the influences of various parameters on the solar cell performance through theoretical analysis and device simulation. It is found in the simulation that the solar cell performance can be improved to some extent by adjusting the doping concentration of the perovskite absorption layer and the electron affinity of the buffer and HTM, while the reduction of the defect density of the perovskite absorption layer significantly improves the cell performance. By further optimizing the parameters of the doping concentration (1.3×10¹⁶ cm^-3) and the defect density (1×10¹⁵ cm^-3) of perovskite absorption layer, and the electron affinity of buffer (4.0 eV) and HTM (2.6 eV), we finally obtain some encouraging results of the J_sc of 31.59 mA/cm², V_oc of 0.92 V, FF of 79.99%, and PCE of 23.36%. The results show that the lead-free CH₃NH₃SnI₃ PSC is a potential environmentally friendly solar cell with high efficiency. Improving the Sn²⁺ stability and reducing the defect density of CH₃NH₃SnI₃ are key issues for the future research, which can be solved by improving the fabrication and encapsulation process of the cell.

Key words: CH₃NH₃SnI₃, perovskite solar cells, device simulation, high efficiency

中图分类号: (Solar cells (photovoltaics))

88.40.H-

88.40.hj (Efficiency and performance of solar cells) 88.40.fc (Modeling and analysis)

杜会静, 王韦超, 朱键卓. Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency[J]. 中国物理B, 2016, 25(10): 108802-108802.

Hui-Jing Du(杜会静), Wei-Chao Wang(王韦超), Jian-Zhuo Zhu(朱键卓). Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency[J]. Chin. Phys. B, 2016, 25(10): 108802-108802.

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Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency

Device simulation of lead-free CH₃NH₃SnI₃ perovskite solar cells with high efficiency

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