AUTHOR=Zhao Jingda , Wang Xin , Pan Yuzhu , Xu Yubing , Li Yuwei , Chen Jing , Wu Jun , Li Qing , Zhao Zhiwei , Zhang Xiaobing , Akram Javed , Bae Byung Seong , Yang Haining , Lei Wei 

TITLE=Photo-Diodes Based on CH3NH3PbCl3 Perovskite Single Crystals by Epitaxial Growth for Ultraviolet Photo-Detection

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.659782

DOI=10.3389/fphy.2021.659782

ISSN=2296-424X

ABSTRACT=<p>Organic-inorganic hybrid methylammonium lead halide perovskite MAPbX3 (where MA = CH<sub>3</sub>NH<sub>3</sub>, and <italic>X</italic> = Cl, Br, I) single crystals are potential semiconductors for photo-detection due to their excellent optoelectronic performance. In particular, MAPbCl<sub>3</sub> single crystal is a wide-band-gap (2.9 eV) semiconductor which is suitable for ultraviolet (UV) detection. In this work, n<sup>−</sup>-n<sup>+</sup> photo-diodes are fabricated through solution-processed epitaxial growth, growing Bi-doped MAPbCl<sub>3</sub> epitaxial layer on MAPbCl<sub>3</sub> single crystal substrate. The epitaxial layer effectively improves the interface between n<sup>−</sup>-type and n<sup>+</sup>-type layers and leads to low dark current. This work provides useful information for UV detection based on perovskites.</p>