Lewis Base Plays a Double-Edged-Sword Role in Trap State Engineering of Perovskite Polycrystals.

J Phys Chem Lett

Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, China.

Published: February 2022

We report the double-edged-sword effect of the thiourea (a typical Lewis base) additive for tailoring the trap state distribution of perovskite polycrystalline films. Through the thiourea treatment, the polycrystal grain size is greatly increased because of the reduced crystallization activation energy, which, together with the surface defect passivation, alters the density of the energetically "deep" and "shallow" trap states in a trade-off manner. Based on this finding and further photoelectric and spectral studies, the nonmonotonic dependence of the photoluminescence intensity on the thiourea concentration and the complicated time-resolved photoluminescence behavior are excellently clarified. As a proof of concept, the photophysical performance of perovskite polycrystals is optimized via a modified Lewis base treatment by taking the proposed double-edged-sword effect into account.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.jpclett.2c00167DOI Listing

Publication Analysis

Top Keywords

lewis base
12
trap state
8
perovskite polycrystals
8
base plays
4
plays double-edged-sword
4
double-edged-sword role
4
role trap
4
state engineering
4
engineering perovskite
4
polycrystals report
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!