Vertically Stacked Au/PbS/CsPbCl₃ Phototransistors for Plasmon-Enhanced High-Performance Broadband Photodetection

Abstract

All inorganic perovskites have been regarded as attractive optoelectronic materials due to their tunable properties, good stability, and low-temperature processing techniques. However, the relatively low responsivity and narrow response range still hinder their potential for optoelectronic applications. In this work, vertically stacked Au/ PbS/CsPbCl 3 phototransistors were fabricated by a low-temperature solution method. The phototransistors achieved a wide spectral photodetection of 300−1100 nm. The phototransistors had an effective electron mobility of 654.75 cm 2 /V s without light illumination. Under 532 nm incident light, due to the enhancement of plasmonic Au nanoparticles, the phototransistors demonstrated a remarkable responsivity of 3892 A/ W, a high detectivity of 3.29 × 10 13 Jones, as well as an ultrahigh external quantum efficiency of 10 6 %. In addition, the phototransistors also exhibited excellent stability in air. The results demonstrate that a vertically stacked Au/PbS/CsPbCl 3 architecture is a promising candidate for broadband photodetection.

Passivating the vacancy defects of CsPbCl3 polycrystalline films by a Cl-containing ionic liquid for self-powered, charge-transport-layer-free UV photodetectors

“…The previously reported CsPbCl 3 -based UV photodetectors are mainly constructed by CsPbCl 3 nano-crystal/platelet, 2,17–19 micro-wire/platelet/crystal, 1,20–22 and single crystal. 23 These devices can be mainly divided into photoconductive and phototransistor types, which usually possess horizontal architectures with the CsPbCl 3 layer lying between the electrodes.…”

“…2,14 Compared to them, CsPbCl 3 perovskite possesses a suitable wide optical bandgap (B2.99 eV), prominent UV response property as well as high UV durability, showing great prospects in UV detection. 15,16 The previously reported CsPbCl 3 -based UV photodetectors are mainly constructed by CsPbCl 3 nano-crystal/platelet, 2,[17][18][19]…”

“…These kinds of devices need an external power supply to work, inevitably enlarging the energy consumption and volume of the system. Besides, their response times are always too long (microsecondscale) to capture high-frequency UV signals, 18,19 restricting their application scope. In comparison with the nano-or microstructured CsPbCl 3 photosensitive layers, the polycrystalline CsPbCl 3 film with micrometer-sized crystals has fewer grain boundaries (GBs) and carrier recombination sites.…”

Heterointerface engineering of tetragonal CsPbCl3 based ultraviolet photodetectors with pentacene for enhancing the photoelectric performance

“…This discrepancy is mostly due to the inferior quality of the solution processed CsPbCl 3 films, which is primarily caused by the low solubility of the CsCl precursor in the commonly used solvents. 19 Up to now, CsPbCl 3 nanocrystals/wires [20][21][22][23][24][25][26] and microcrystals/wires 18,[27][28][29][30] have been fabricated through ingenious optimizations of the processing technologies. The CsPbCl 3 films in diverse forms have been applied to photodetectors with photovoltaic or photoconductive structures, and gained breakthroughs in responsivity, detectivity, response speed, and on/off ratios.…”

Boosting the Performance of Self-Powered CsPbCl3-Based UV Photodetectors by a Sequential Vapor-Deposition Strategy and Heterojunction Engineering

“…The flexible UV photodetector based on this structure yielded a high detectivity ( D *) of 9 × 10 14 Jones but the response speed was still slow (28/31 ms). To further enhance the UV detection performance of CsPbCl 3 NC-based devices, interface modification by PbS quantum dots and 3-mercaptopropionic acid, etc., was employed by some groups. − Although the stability of the devices was enhanced, the detection performance was still unsatisfactory even under a high bias voltage. Given that the narrow-band-gap PbS quantum dots layer exhibited a good response to the visible and near-infrared light signals, it could act as a visible light absorber.…”