Open AccessVapor‐Deposited Cs 2 AgBiCl 6 Double Perovskite Films toward Highly Selective and Stable Ultraviolet Photodetector
Author(s) -
Wang Ming,
Zeng Peng,
Wang Zenghui,
Liu Mingzhen
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201903662
Subject(s) - perovskite (structure) , photodetector , materials science , optoelectronics , crystallinity , ultraviolet , band gap , diode , thin film , halide , dark current , fabrication , chemical vapor deposition , specific detectivity , nanotechnology , chemical engineering , chemistry , inorganic chemistry , composite material , medicine , alternative medicine , pathology , engineering
Double perovskites have shown great potentials in addressing the toxicity and instability issues of lead halide perovskites toward practical applications. However, fabrication of high‐quality double perovskite thin films has remained challenging. Here, sequential vapor deposition is used to fabricate high‐quality Cs 2 AgBiCl 6 perovskite films with balanced stoichiometry, superior morphology, and highly oriented crystallinity, with an indirect bandgap of 2.41 eV. Using a diode structure, self‐powered Cs 2 AgBiCl 6 ultraviolet (UV) photodetectors are demonstrated with high selectivity centered at 370 nm, with low dark current density (≈10 −7 mA cm −2 ), high photoresponsivity (≈10 mA W −1 ), and detectivity (≈10 12 Jones). Its detectivity is among the highest in all double‐perovskite‐based photodetectors reported to date and surpassing the performance of other perovskite photodetectors as well as metal oxide in the UV range. The devices also show excellent environmental and irradiation stability comparable to state‐of‐the‐art UV detectors. The findings help pave the way toward application of double perovskites in optoelectronic devices.