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High‐Quality Cuboid CH 3 NH 3 PbI 3 Single Crystals for High Performance X‐Ray and Photon Detectors
Author(s) -
Ye Fei,
Lin Hong,
Wu Haodi,
Zhu Lu,
Huang Zhanfeng,
Ouyang Dan,
Niu Guangda,
Choy Wallace C. H.
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201806984
Subject(s) - cuboid , materials science , responsivity , crystal (programming language) , fabrication , nucleation , optoelectronics , crystallography , photodetector , chemistry , geometry , organic chemistry , mathematics , medicine , alternative medicine , pathology , computer science , programming language
Organic–inorganic halide hybrid perovskite materials are promising materials for X‐ray and photon detection due to their superior optoelectronic properties. Single‐crystal (SGC) perovskites have increasingly attracted attention due to their substantially low crystal defects, which contribute to improving the figures of merit of the devices. Cuboid CH 3 NH 3 PbI 3 SGC with the naturally favorable geometry for device fabrication is rarely reported in X‐ray and photon detection application. The concept of seed dissolution‐regrowth to improve crystal quality of cuboid CH 3 NH 3 PbI 3 SGC is proposed and a fundamental understanding of the nucleation and growth is provided thermodynamically. The X‐ray detector fabricated from cuboid CH 3 NH 3 PbI 3 SGC demonstrates the firstly reported high sensitivity of 968.9 µC −1 Gy −1 cm −2 under −1 V bias. The results also show that the favorable crystal orientation and high quality of cuboid CH 3 NH 3 PbI 3 leads to better responsivity and faster response speed than the more common dodecahedral CH 3 NH 3 PbI 3 in photodetection. Consequently, the work paves a way to synthesize high‐quality perovskite SGCs and benefits the application of MAPbI 3 SGCs with preferred crystal orientation and favorable crystal geometry for emerging device applications.