Dendrimer Modification Strategy Based on the Understanding of the Photovoltaic Mechanism of a Perovskite Device under Full Sun and Indoor Light

Mengen Ma; Yilin Zeng; Yuzhao Yang; Cuiling Zhang; Yujiao Ma; Shaohang Wu; Chong Liu; Yaohua Mai

doi:10.1021/acsami.3c02979

Dendrimer Modification Strategy Based on the Understanding of the Photovoltaic Mechanism of a Perovskite Device under Full Sun and Indoor Light

ACS Appl Mater Interfaces. 2023 May 31;15(21):25550-25557. doi: 10.1021/acsami.3c02979. Epub 2023 May 17.

Authors

Mengen Ma¹, Yilin Zeng¹, Yuzhao Yang^{1

2}, Cuiling Zhang¹, Yujiao Ma¹, Shaohang Wu¹, Chong Liu¹, Yaohua Mai¹

Affiliations

¹ Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou 510632, China.
² School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China.

PMID: 37197996
DOI: 10.1021/acsami.3c02979

Abstract

The wide-band-gap inorganic CsPbI₂Br perovskite material provides a highly matched absorption range with the indoor light spectrum and is expected to be used in the fabrication of highly efficient indoor photovoltaic cells (IPVs) and self-powered low-power Internet of Things (IoT) sensors. However, the defects that cause nonradiative recombination and ion migration are assumed to form leakage loss channels, resulting in a severe impact on the open-circuit voltage (V_OC) and the fill factor (FF) of IPVs. Herein, we introduce poly(amidoamine) (PAMAM) dendrimers with multiple passivation sites to fully repair the leakage channels in the devices, taking into account the characteristics of IPVs that are extremely sensitive to nonradiative recombination and shunt resistance. The as-optimized IPVs demonstrate a promising PCE of 35.71% under a fluorescent light source (1000 lux), with V_OC increased from 0.99 to 1.06 V and FF improved from 75.21 to 84.39%. The present work provides insight into the photovoltaic mechanism of perovskites under full sun and indoor light, which provides guidance for perovskite photovoltaic technology with industrialization prospects.

Keywords: CsPbI2Br perovskite; Ohmic leakage; PAMAM; defect passivation; indoor photovoltaic cells.