Perovskite Single‐Crystal Microwire‐Array Photodetectors with Performance Stability beyond 1 Year

Abstract

Compared with thin‐film morphology, 1D perovskite structures such as micro/nanowires with fewer grain boundaries and lower defect density are very suitable for high‐performance photodetectors with higher stability. Although the stability of perovskite microwire‐based photodetectors has been substantially enhanced in comparison with that of photodetectors based on thin‐film morphology, practical applications require further improvements to the stability before implementation. In this study, a template‐assisted method is developed to prepare methylammonium lead bromide (MAPbBr3) micro/nanowire structures, which are encapsulated in situ by a protective hydrophobic molecular layer. The combination of the protective layer, high crystalline quality, and highly ordered microstructures significantly improve the stability of the MAPbBr3 single‐crystal microwire arrays. Consequently, these MAPbBr3 single‐crystal microwire‐array‐based photodetectors exhibit significant long‐term stability, maintaining 96% of the initial photocurrent after 1 year without further encapsulation. The lifetime of such photodetectors is hence approximately four times longer than that of the most stable previously reported perovskite micro/nanowire‐based photodetector; this is thought to be the most stable perovskite photodetector reported thus far. Furthermore, this work should contribute further toward the realization of perovskite 1D structures with long‐term stability.

A High‐Performance and Long‐Term Air‐Stable CH3NH3PbI3/C8BTBT Heterojunction Photodetector Fabricated via Chemical Vapor Deposition

“…[ 4–6 ] In recent years, metal–halide perovskites with advantages of strong light absorption, low defect density, high carrier mobility, long carrier lifetime, and adjustable bandgap are suitable for the application in the field of photovoltaics. [ 7–10 ] In addition, organic–inorganic hybrid perovskites (e.g., MAPbI 3 ) have emerged as a promising class of potentially revolutionary optoelectronic semiconductors for applications in photodetectors, solar cells, light‐emitting diodes (LEDs), and lasers. [ 11–14 ]…”

High-performance broadband photodetectors based on all-inorganic perovskite CsPb(Br/I)3 nanocrystal/CdS-microwire heterostructures

“…[1][2][3][4][5][6] Photodetectors are of great importance because of their excellent performance and wide application in photoswitching, photoelectric conversion, and optical communication. [7][8][9][10][11] Several groups have proposed photodetectors fabricated using different CdS nanostructures. [12][13][14] Although this is considered a breakthrough in the eld, these photodetectors exhibit relatively restricted performance due to the limited optoelectronic-transfer efficiency and light-absorption ability of the CdS nanomaterials.…”

Directional and Fast Photoluminescence from CsPbI3 Nanocrystals Coupled to Dielectric Circular Bragg Gratings

“…They are easy to synthesize and can be integrated with various photonic nanostructures [ 3 , 4 , 5 ]. The all-inorganic perovskite have found wide applications in optoelectronic devices, such as nanolasers [ 6 , 7 , 8 , 9 , 10 , 11 ], LED [ 12 , 13 ], solar cells [ 14 , 15 , 16 , 17 ], and photodetectors [ 18 , 19 ]. Notably, recent studies also suggest that the perovskite NCs are excellent emitters of non-classic light at cryogenic temperatures [ 20 , 21 , 22 ].…”