Polarized Molecule 4-(Aminomethyl) Benzonitrile Hydrochloride for Efficient and Stable Perovskite Solar Cells

Xia Chen; Jihuai Wu; Guodong Li; Yitian Du; Qi Chen; Chunyan Deng; Yuan Xu; Sijia Zhu; Fangfang Cai; Juanmei Liu; Yuelin Wei; Yunfang Huang

doi:10.1021/acsami.2c09058

Polarized Molecule 4-(Aminomethyl) Benzonitrile Hydrochloride for Efficient and Stable Perovskite Solar Cells

ACS Appl Mater Interfaces. 2022 Jul 18. doi: 10.1021/acsami.2c09058. Online ahead of print.

Authors

Xia Chen¹, Jihuai Wu¹, Guodong Li¹, Yitian Du¹, Qi Chen¹, Chunyan Deng¹, Yuan Xu¹, Sijia Zhu¹, Fangfang Cai¹, Juanmei Liu¹, Yuelin Wei¹, Yunfang Huang¹

Affiliation

¹ Research Center of Environment-Friendly Functional Materials, Ministry of Education, Institute of Materials Physical Chemistry, Huaqiao University, Xiamen 361021, China.

PMID: 35849842
DOI: 10.1021/acsami.2c09058

Abstract

The rapid development of perovskite solar cells (PSCs) makes it one of the most competitive photovoltaic devices in the field of new energy. However, the suboptimal performance and poor stability caused by numerous defects are still the main factors limiting the development of PSCs. Herein, a polarized molecule additive of 4-(aminomethyl) benzonitrile hydrochloride (AMBNCl) is introduced into perovskite. Owing to its special polar electron density distribution, -C≡N group, -NH₃⁺ terminal, and Cl^- ions, the modification of AMBNCl can improve the quality of perovskite crystal growth, passivate the defects of Pb²⁺, adjust the energy level array between the perovskite layer and hole-transport layer, and alleviate the carrier nonradiative recombination. As a result, the AMBNCl-modified device achieves a champion efficiency of 23.52%. The unpacked device still maintained 91.2% of its original efficiency after storing in an air environment (RH ∼40%, 25 °C) for 50 days.

Keywords: 4-(aminomethyl) benzonitrile hydrochloride (AMBNCl); additive; electron density distribution; perovskite solar cell; polarized molecule.