The Dawn of Lead‐Free Perovskite Solar Cell: Highly Stable Double Perovskite Cs2AgBiBr6 Film

• Published in: Advanced science Vol. 5; no. 3; pp. 1700759 - n/a
• Main Authors: Wu, Cuncun, Zhang, Qiaohui, Liu, Yang, Luo, Wei, Guo, Xuan, Huang, Ziru, Ting, Hungkit, Sun, Weihai, Zhong, Xinrui, Wei, Shiyuan, Wang, Shufeng, Chen, Zhijian, Xiao, Lixin
• Format: Journal Article
• Language: English
• Published: Hoboken John Wiley and Sons Inc 01-03-2018; Wiley
• Subjects: Communication; Communications; Cs2AgBiBr6; double perovskites; lead‐free; perovskite solar cell; planar heterojunction
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.201700759

Recently, lead‐free double perovskites have emerged as a promising environmentally friendly photovoltaic material for their intrinsic thermodynamic stability, appropriate bandgaps, small carrier effective masses, and low exciton binding energies. However, currently no solar cell based on these double perovskites has been reported, due to the challenge in film processing. Herein, a first lead‐free double perovskite planar heterojunction solar cell with a high quality Cs2AgBiBr6 film, fabricated by low‐pressure assisted solution processing under ambient conditions, is reported. The device presents a best power conversion efficiency of 1.44%. The preliminary efficiency and the high stability under ambient condition without encapsulation, together with the high film quality with simple processing, demonstrate promise for lead‐free perovskite solar cells.
A high‐quality double perovskite Cs2AgBiBr6 film is successfully demonstrated using a low‐pressure assisted solution method. A planar heterojunction solar cell based on this Cs2AgBiBr6 film shows high stability with an optimal power conversion efficiency of 1.44%. The preliminary results are promising for the development lead‐free perovskite solar cells.