3D/2D Perovskite Single Crystals Heterojunction for Suppressed Ions Migration in Hard X‐Ray Detection

Halide perovskites exhibit diverse properties depending on their compositions. However, integrating desired properties into one material is still challenging. Here, a facile solution‐processed epitaxial growth method to grow 2D perovskite single crystal on top of 3D perovskite single crystal, which...

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Bibliographic Details
Published in:Advanced functional materials Vol. 31; no. 49
Main Authors: He, Yuhong, Pan, Wanting, Guo, Chunjie, Zhang, Huimao, Wei, Haotong, Yang, Bai
Format: Journal Article
Language:English
Published: Hoboken Wiley Subscription Services, Inc 01.12.2021
Subjects:
3D/2D perovskite single crystals
Carrier mobility
Crystal defects
Crystal growth
Crystal surfaces
Epitaxial growth
hard X‐rays detection
heterojunction
Heterojunctions
Materials science
Perovskites
Single crystals
solution‐processed epitaxial growth
suppressed ions migration
Surface defects
Thickness
ISSN:1616-301X, 1616-3028
Online Access:Get full text
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Summary:Halide perovskites exhibit diverse properties depending on their compositions. However, integrating desired properties into one material is still challenging. Here, a facile solution‐processed epitaxial growth method to grow 2D perovskite single crystal on top of 3D perovskite single crystal, which can passivate the surface defects for improved device performance is reported. Short formamidine (FA+) ions are replaced by long organic cations, which can fully align and cover the single crystal surface to prevent the ions migration or short FA+ ions volatilization. The thickness of epitaxial layer can be finely adjusted by controlling the growth time. The defect density of single crystals heterojunction is only 3.18 × 109 cm−3, and the carrier mobility is 80.43 cm2 V−1 s−1, which is greater than that of the control 3D perovskite single crystal. This study for the first time realized large area 3D/2D perovskite single crystals heterojunction, which suppressed ions migration and exhibited advanced performance in hard X‐rays detection applications. This strategy also provides a way to grow large area 2D perovskite single crystal from solution processes. The 2D epitaxial layer of the 3D/2D perovskite single crystals heterojunction can passivate the surface defects and suppress ion migration or short formamidine FA+ ion volatilization, which boost its optoelectric properties. The 3D/2D heterojunction X‐ray detector exhibits stable response to 120 kVp hard X‐rays, with the lowest detectable dose rate of 55 nGyairs−1.
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ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202104880