Light and Electrically Induced Phase Segregation and Its Impact on the Stability of Quadruple Cation High Bandgap Perovskite Solar Cells

• DOI: 10.1021/acsami.7b06816
• Publication Date: 2017-07-24T21:11:56Z
• Authors: The Duong; Hemant Kumar Mulmudi; YiLiang Wu; Xiao Fu; Heping Shen; Jun Peng; Nandi Wu; Hieu T. Nguyen; Daniel Macdonald; Mark Lockrey; Thomas P. White; Klaus Weber; Kylie Catchpole
• Keywords: 535; 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Perovskite material with a bandgap of 1.7–1.8 eV is highly desirable for the top cell in tandem configuration lower bottom cell, such as silicon cell. This can be achieved by alloying iodide and bromide anions, but light-induced phase-segregation phenomena are often observed perovskite films this kind, implications solar efficiency. Here, we investigate phase segregation inside quadruple-cation complete structure find that magnitude phenomenon dependent on operating condition Under short-circuit even maximum power point conditions, found to negligible compared under open-circuit conditions. In accordance finding, cells based 1.73 retain 94% original efficiency after 12 h operation at point, while only retains 82% condition. result highlights need have standard methods including light/dark bias testing stability cells. Additionally, when was forward biased 1.2 V dark, which indicates photoexcitation not required induce segregation.