Synergetic Electrostatic and Steric Effects in α‐FAPbI3 Single Crystals For X‐Ray Detection and Imaging

Author:

Jiang Wei1,Li Haibin1,Liu Dan1,Ren Jiwei1,Zhao Yingying1,Wu Jiarui2,Chen Jun1,Zhou Linsen1,Wang Feng3,Zhao Yiying1ORCID

Affiliation:

1. Institute of Materials China Academy of Engineering Physics Jiangyou 621908 China

2. College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China

3. Department Materials Science and Engineering City University of Hong Kong 83 Tat Chee Avenue Hong Kong SAR China

Abstract

AbstractIt is still challenging to stabilize α‐FAPbI3 perovskite for high performance optoelectrical devices. Herein, a novel strategy is proposed utilizing the synergetic electrostatic and steric effect to stabilize the α‐FAPbI3 phase and suppress the ion migration. Dimethylamine (DMA+) cations are chosen as the dopant to fabricate FA0.96DMA0.04PbI3 single crystals (SCs). DFT calculations reveal that DMA+ cations can improve the stability of α‐FAPbI3 phase in both thermodynamics (lower Gibbs free energy) and kinetics (higher defect formation and migration energy). The resulting SCs exhibit an environmental stability over 100 days and an extraordinary low dark current drift of 3.7 × 10−7 nA cm−1 s−1 V−1, comparable to 2D perovskite SCs. The X‐ray detectors have also achieved the‐state‐of‐the‐art performance in X‐ray detection and imaging. This work demonstrates the significance of electrostatic and steric effects in improving the phase and operational stability of perovskites.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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