Mixed Cations Enabled Combined Bulk and Interfacial Passivation for Efficient and Stable Perovskite Solar Cells

Pengfei Wu; Shirong Wang; Jin Hyuck Heo; Hongli Liu; Xihan Chen; Xianggao Li; Fei Zhang

doi:10.1007/s40820-023-01085-7

Mixed Cations Enabled Combined Bulk and Interfacial Passivation for Efficient and Stable Perovskite Solar Cells

Nanomicro Lett. 2023 Apr 30;15(1):114. doi: 10.1007/s40820-023-01085-7.

Authors

Pengfei Wu^{1

2}, Shirong Wang^{3

4}, Jin Hyuck Heo⁵, Hongli Liu^{1

2}, Xihan Chen⁶, Xianggao Li^{1

2}, Fei Zhang^{7

8}

Affiliations

¹ School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
² Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People's Republic of China.
³ School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China. [email protected].
⁴ Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People's Republic of China. [email protected].
⁵ Department of Chemical and Biological Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul, 17104, Republic of Korea. [email protected].
⁶ SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, People's Republic of China.
⁷ School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China. [email protected].
⁸ Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, People's Republic of China. [email protected].

Abstract

Here, we report a mixed GAI and MAI (MGM) treatment method by forming a 2D alternating-cation-interlayer (ACI) phase (n = 2) perovskite layer on the 3D perovskite, modulating the bulk and interfacial defects in the perovskite films simultaneously, leading to the suppressed nonradiative recombination, longer lifetime, higher mobility, and reduced trap density. Consequently, the devices' performance is enhanced to 24.5% and 18.7% for 0.12 and 64 cm², respectively. In addition, the MGM treatment can be applied to a wide range of perovskite compositions, including MA-, FA-, MAFA-, and CsFAMA-based lead halide perovskites, making it a general method for preparing efficient perovskite solar cells. Without encapsulation, the treated devices show improved stabilities.

Keywords: Alternating-cation-interlayer; Bulk defects; Interfacial passivation; Perovskite solar cells.