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

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

doi:10.3389/fphy.2021.659782

Abstract

Organic-inorganic hybrid methylammonium lead halide perovskite MAPbX3 (where MA = CH3NH3, and X = Cl, Br, I) single crystals are potential semiconductors for photo-detection due to their excellent optoelectronic performance. In particular, MAPbCl3 single crystal is a wide-band-gap (2.9 eV) semiconductor which is suitable for ultraviolet (UV) detection. In this work, n−-n+ photo-diodes are fabricated through solution-processed epitaxial growth, growing Bi-doped MAPbCl3 epitaxial layer on MAPbCl3 single crystal substrate. The epitaxial layer effectively improves the interface between n−-type and n+-type layers and leads to low dark current. This work provides useful information for UV detection based on perovskites.

Highlights

Organic-inorganic hybrid methylammonium lead halide perovskite (MAPbX3, where MA = CH3NH3, and X = Cl, Br, I) perovskite have attracted a lot of attention due to their excellent optoelectronic properties, such as tunable band gap, low trap density, and long diffusion length [1, 2]
The absorption edge of pristine MAPbCl3 single crystal was located at 430 nm, and the PL peak is obtained at 436 nm with a narrow FWHM of 14.9 nm confirming the high quality of the single crystal [7]
The absorption of Bi-doped MAPbCl3 single crystal is in good agreement with results that were previously reported [30]

Summary

Introduction

Organic-inorganic hybrid methylammonium lead halide perovskite (MAPbX3, where MA = CH3NH3, and X = Cl, Br, I) perovskite have attracted a lot of attention due to their excellent optoelectronic properties, such as tunable band gap, low trap density, and long diffusion length [1, 2]. There are reports on the visible and near infrared detection applications of MAPbI3 and MAPbBr3 single crystals because of their suitable band gap and high optical absorption coefficient [10, 11]. MAPbCl3 single crystals are wide-bandgap (2.9 eV) semiconductors [12] which are insensitive to visible light while having a high absorption for ultraviolet (UV) radiation (wavelength ∼100–400 nm) [13]. These characters make MAPbCl3 single crystals suitable in applications of UV detection [14–16]. It is necessary to obtain a photo-diode based on MAPbCl3 with high performance

Methods

Results

Conclusion