Unencapsulated CsPbClBr₂ Film Photodetectors Grown by Thermal Vacuum Deposition Exhibit Exceptional Environmental Stability in High-Humidity Air

Abstract

All-inorganic perovskites such as CsPbX 3 (X = Cl, Br, I) have recently emerged frequently in the field of optoelectronic devices, such as high-performance photodetectors (PDs), lasers, and flexible display devices, due to their excellent physical properties, especially their higher thermal stability. However, the practical application of solution-treated CsPbX 3 films is still hindered by the poor solubility of the precursors. To tackle this issue, vacuum deposition is employed to prepare highquality CsPbClBr 2 thin films, which could overcome the aforementioned predicament. In this work, CsPbClBr 2 thin films are prepared using single source thermal vacuum deposition with uniform and dense morphology. Moreover, the CsPbClBr 2 PD shows a high responsivity (R) of 28.93 mA/W and a fast response time of 270/310 ms. In particular, the performance of the unpackaged CsPbClBr 2 PDs still maintains 84% of their initial values after being irradiated continuously for 5 h with the 405 nm line laser with an optical power density of 0.15 mW/cm 2 . More importantly, even the unpackaged devices demonstrate more than 81% retention of their original R after being exposed to air (22 °C, 61% RH) for 28 days. All the above results exhibit outstanding maneuverability and storage stability of the unpackaged devices. Our work provides a promising way to fabricate high-coverage, dense, and uniform perovskite thin films for optoelectronic device applications.

Positive and Negative Effects under Light Illumination in Halide Perovskites

“…Adapted with permission. [ 110 ] Copyright 2022, American Chemical Society. f) I – t curve of a CsPbClBr 2 photodetector under various light intensities (405 nm, 0.08–20.2 mW cm −2 ).…”

Synthesis of Size-Adjustable CsPbBr3 Perovskite Quantum Dots for Potential Photoelectric Catalysis Applications

“…Over the past years, metal halide perovskite, a new type of semiconductor material, has attracted wide attention in the photovoltaic [1], luminescence [2] and detection [3] fields because of its excellent photoelectric properties. Compared with traditional semiconductors, perovskites have a special structure, and the general formula is ABX 3 [4].…”

Synthesis of All-Inorganic Halide Perovskite Nanocrystals for Potential Photoelectric Catalysis Applications

“…By means of time-resolved terahertz spectroscopy CsPbBr 3 NCs have been found to possess excellent free carrier performance, with carrier mobilities of up to 4500 cm 2 V −1 s −1 and diffusion lengths greater than 9.2 µm, making for ideal intrinsic transport properties [14]. Thus, halide perovskite holds great value for optoelectronic applications and offers a wide scope 2 of 13 of prospects in high-efficiency solar cells [16][17][18], sensitive photodetectors [19][20][21], lowthreshold lasers [22][23][24], light-emitting diodes (LEDs) [25][26][27], scintillators [28][29][30], and bioimaging systems [31][32][33]. Among the multitude of applications, metal halide perovskite is particularly impressive in the field of solar cells.…”