Ultrasensitive, flexible perovskite nanowire photodetectors with long‐term stability exceeding 5000 h

Abstract

Photodetectors (PDs) based on perovskite nanowires are among the most promising next‐generation photodetection technologies; however, their poor long‐term stability is the biggest challenge limiting their commercial application. Herein, an ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF4), is incorporated as an additive into methylammonium lead triiodide (MAPbI3) nanowires; this not only effectively passivates defects to inhibit perovskite degradation but also leads to the formation of nanochannels, enabling fast charge transfer. As a result, the long‐term stability and performance of MAPbI3 nanowires are considerably improved. The detectivity, linear detection range, and noise equivalent power of the MAPbI3 nanowire PD reach 2.06 × 1013 Jones, 160 dB, and 1.38 × 10−15 W Hz−1/2, respectively, comparable to the highest performance of perovskite nanowire PDs reported to date. Moreover, the unencapsulated PD can maintain 100% of its initial performance after being exposed to an open‐air environment for more than 5000 h, establishing it as the most stable perovskite nanowire PD reported to date. Notably, the PD exhibits improved diffuse reflection imaging ability when compared with commercial silicon photodiode S2386. This study provides a new strategy for constructing sensitive, stable, and flexible perovskite PDs and will accelerate their commercial application in the future.

Regulating interface Schottky barriers toward a high-performance self-powered imaging photodetector

“…The EQE (external quantum efficiency) spectrum of the Pt–Ag photodetector was recorded at 0 V (Fig. S6b, ESI † ), R is a function of EQE, which is calculated by the following formula: 57 where h , c , and q are Planck constant, the velocity of light, and the unit charge, respectively. The EQE value for the photoresponse is 26.74% at 530 nm.…”

Metal Halide Perovskite Nanowires: Controllable Synthesis, Mechanism, and Application in Optoelectronic Devices

“…Adding 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) as an additive to MAPbI 3 NWs improved device performance owing to fewer defects, better crystallization, enhanced light absorption, and improved charge transfer in MAPbI 3 NWs. The NW PD exhibited remarkable performance with a detectivity, linear detection range, and noise-equivalent power of 2.06 × 10 13 Jones, 160 dB, and 1.38 × 10 −15 W Hz −1/2 , respectively, and the stability of the device was effectively improved [ 107 ].…”

A high-performance self-powered photodetector based on a concentric annular α-FAPbI3/MAPbI3single crystal lateral heterojunction with broadband detectivity

“…In comparison with polycrystalline thin films, perovskite single crystals (SCs) have superior low trap density, 31 long diffusion length, 32 high carrier mobility and especially high stability, 68,71,72 which makes them attract much attention in photoelectric detection. [33][34][35] Zou et al reported a perovskite SC/ graphene vertical structure with high photodetectivity (B2 Â 10 13 Jones).…”