Additive Engineering for Efficient and Stable MAPbI3-Perovskite Solar Cells with an Efficiency of over 21

Junlei Tao; Zhiwen Wang; Hongwei Wang; Jinliang Shen; Xiaoni Liu; Jingwei Xue; Hansong Guo; Guangsheng Fu; Weiguang Kong; Shaopeng Yang

doi:10.1021/acsami.1c13136

Additive Engineering for Efficient and Stable MAPbI₃-Perovskite Solar Cells with an Efficiency of over 21

ACS Appl Mater Interfaces. 2021 Sep 22;13(37):44451-44459. doi: 10.1021/acsami.1c13136. Epub 2021 Sep 10.

Authors

Junlei Tao^{1

2

3

4}, Zhiwen Wang¹, Hongwei Wang¹, Jinliang Shen¹, Xiaoni Liu¹, Jingwei Xue¹, Hansong Guo¹, Guangsheng Fu¹, Weiguang Kong¹, Shaopeng Yang^{1

2

3

4}

Affiliations

¹ Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science and Technology, Hebei University, Baoding 071002, China.
² National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, China.
³ Institute of Life Science and Green Development, Hebei University, Baoding 071002, China.
⁴ State Key Laboratory of Photovoltaic Materials & Technology, Yingli Solar, Baoding 071051, China.

PMID: 34506105
DOI: 10.1021/acsami.1c13136

Abstract

The high density of defects in MAPbI₃ perovskite films brings about severe carrier nonradiative recombination loss, which lowers the performance of MAPbI₃-based perovskite solar cells (PSCs). Here, methylamine cyanate (MAOCN) molecules were introduced into MAPbI₃ solutions to manipulate the crystallizatsion of the MAPbI₃ films. MAOCN molecules can slow down the volatilization rate of the solvent and delay the crystallization process of the MAPbI₃ film. The crystal quality of the MAPbI₃ films is effectively optimized without an additive residue. Perovskite films treated by MAOCN have lower defect density and longer carrier lifetime, which lowers the carrier recombination loss. Meanwhile, the MAPbI₃ film based on MAOCN has a more hydrophobic surface. The final MAPbI₃-based device efficiency reached 21.28% (V_OC = 1.126 V, J_SC = 23.29 mA/cm², and FF = 81.13). After 30 days of storage under atmospheric conditions, the efficiency of unencapsulated MAOCN-based PSCs only dropped by about 5%.

Keywords: MAPbI3; additive; crystallization; inverted planar; perovskite; solar cells.