Self-Powered Dual-Color UV–Green Photodetectors Based on SnO₂ Millimeter Wire and Microwires/CsPbBr₃ Particle Heterojunctions

Abstract

Multiband detection has always been a challenge and has drawn much attention in the development of photodetectors (PDs). Herein, we present controllable synthesis of SnO 2 wires with different sizes via chemical vapor deposition and formed composites with CsPbBr 3 particles to realize dual spectral response. We constructed PDs based on a single SnO 2 millimeter wire decorated with CsPbBr 3 particles (SnO 2 MMW/CsPbBr 3 ), which showed a stepped spectrum, fast response speed, and self-powered function. Meanwhile, SnO 2 microwires/CsPbBr 3 composites (SnO 2 MWs/CsPbBr 3 ) were also utilized to fabricate PDs. It is noteworthy that detection occurred in two different wavelength bands (320 and 520 nm) with equivalent intensity at a bias of 0 V. The self-powered feature of this device comes from the built-in electric field at the interface of SnO 2 /CsPbBr 3 , and the dual-color response originates from asymmetric junction barriers between conduction bands of SnO 2 and CsPbBr 3 . This work demonstrated promising self-powered PDs that are capable of multiband detection.

Asymmetric Contact‐Induced Self‐Driven Perovskite‐Microwire‐Array Photodetectors

“…[27] The detector exhibited an acceptable response speed with rise/decay times of 80/240 µs. [32][33][34][35] However, to the best of our knowledge, PV-type photodetectors employing perovskite MWs/NWs as the photoactive materials have been far scarcely explored to date. ), high-frequency light detection is essentially required.…”

Tunable self‐powered n‐SrTiO3 photodetectors based on varying CuS‐ZnS nanocomposite film (p‐CuZnS, p‐CuS, and n‐ZnS)

“…P‐n junction‐based detectors have the advantages of wide linear range, fast response speed, low noise, and good photoelectric performance . Significant progresses in p‐n type photodetectors have been achieved with self‐powered behaviors or enhanced performance . However, it is still extremely important to fabricate self‐powered photodetectors with tailorable properties, and exploring their in‐depth mechanism for practical applications.…”

2D Perovskite Sr2Nb3O10 for High‐Performance UV Photodetectors

“…To meet the requirements of next‐generation high‐performance PDs, including energy‐efficient, miniaturized, and flexible applications, 2D materials are considered promising candidates to address the challenges . Among them, 2D perovskites have attracted increasing research interest and been applied to diverse fields, such as light‐emitting diodes (LEDs), solar cells, and PDs, because of the advantages peculiar to them . First, inherited from their bulk counterparts and originated from their reduced dimension, 2D perovskites exhibit a variety of intriguing properties, including tunable bandgap, high photoconductive gain, high photoluminescence (PL) efficiency, and nonlinear optical properties .…”

“…Among them, 2D perovskites have attracted increasing research interest and been applied to diverse fields, such as light‐emitting diodes (LEDs), solar cells, and PDs, because of the advantages peculiar to them . First, inherited from their bulk counterparts and originated from their reduced dimension, 2D perovskites exhibit a variety of intriguing properties, including tunable bandgap, high photoconductive gain, high photoluminescence (PL) efficiency, and nonlinear optical properties . Second, it is found that many properties of 2D perovskites are strongly dependent on their thickness, and the properties show increased sensitivity to applied external fields owing to their ultrathin thickness .…”