Recognizing the Importance of Fast Nonisothermal Crystallization for High-Performance Two-Dimensional Dion-Jacobson Perovskite Solar Cells with High Fill Factors: A Comprehensive Mechanistic Study
Journal
Journal of the American Chemical Society
Journal Volume
144
Journal Issue
32
Pages
14897
Date Issued
2022-08-17
Author(s)
Liu, Yi-Chun
Lin, Jin-Tai
Lee, Yao-Lin
Hung, Chieh-Ming
Chou, Tai-Che
Chao, Wei-Chih
Huang, Zhi-Xuan
Chiang, Tzu-Hsuan
Chuang, Wei-Tsung
Abstract
Two-dimensional (2D) Dion-Jacobson (DJ) perovskite solar cells (PSCs), despite their advantage in versatility of n-layer variation, are subject to poor photovoltaic efficiency, particularly in the fill factor (FF), compared to their three-dimensional counterparts. To enhance the performance of DJ PSCs, the process of growing crystals and hence the corresponding morphology of DJ perovskites are of prime importance. Herein, we report the fast nonisothermal (NIT) crystallization protocol that is previously unrecognized for 2D perovskites to significantly improve the morphology, orientation, and charge transport of the DJ perovskite films. Comprehensive mechanistic studies reveal that the NIT effect leads to the secondary crystallization stage, forming network-like channels that play a vital role in the FF's leap-forward improvement and hence the DJ PSC's performance. As a whole, the NIT crystallized PSCs demonstrate a high power conversion efficiency and an FF of up to 19.87 and 86.16%, respectively. This research thus provides new perspectives to achieve highly efficient DJ PSCs.
Subjects
KINETICS; TEMPERATURE; INTERFACES
SDGs
Publisher
AMER CHEMICAL SOC
Type
journal article