Self-Powered All-Inorganic Perovskite Microcrystal Photodetectors with High Detectivity

Abstract

Organic-inorganic lead halide perovskite microcrystal (MC) films are attractive candidates for fabricating high-performance large-area self-powered photodetectors (PDs) because of their lower trap state density and higher carrier mobility than their polycrystalline counterparts and more suitability of synthesizing large lateral area films than their single-crystal counterparts. Here, we report on the fabrication of self-powered all-inorganic CsPbBr perovskite MC PDs with high detectivity, using a modified solution synthesis method. The MCs are up to about 10 μm in size, and the MC layer is also about 11 μm in thickness. Under 473 nm laser (100 mW) illumination, the CsPbBr MC PDs show responsivity values of up to 0.172 A W, detectivity values of up to 4.8 × 10 Jones, on/off ratios of up to 1.3 × 10, and linear dynamic ranges of up to 113 dB. These performances are significantly better than those of PDs based on polycrystalline perovskite thin films and comparable with those of PDs based on perovskite single crystals.

Atomic‐Layer Deposition‐Assisted Double‐Side Interfacial Engineering for High‐Performance Flexible and Stable CsPbBr3 Perovskite Photodetectors toward Visible Light Communication Applications

“…Yang et al reported that single crystalline perovskite PDs exhibits superior performance than its polycrystalline counterpart, with recorded photoconductive gain of 50 million . However, due to the long charge carrier diffusion length and poor carrier collection efficiency, many reported inorganic perovskite PDs with large grain‐size crystal show large dark current, limited responsivity, and slow photoresponse …”

Solution‐Processed Visible‐Blind Ultraviolet Photodetectors with Nanosecond Response Time and High Detectivity

“…Recently, solution‐processed organic–inorganic halide perovskite (OIHP) materials have garnered tremendous attention in the optoelectronic device application sphere, due to their advantageous properties, such as long carrier lifetime, relatively large carrier mobility, and low trap‐state density . These merits enabled perovskite visible light photodetectors with both high sensitivity and fast response speed . Yet, solution‐processed visible‐blind perovskite UV photodetectors, despite their advances, are still far from the performance offered by high‐temperature‐processed commercial visible‐blind UV photodetectors (see Table S1, Supporting Information).…”

Recent advances on organic‐inorganic hybrid perovskite photodetectors with fast response

“…10-17 In addition, OIHP meterials are emerging with excellent electrical and optical properties in such as low excitonic binding energy, high charge carrier mobility, long carrier lifetime, and charge diffusion length, which have attracted great interest and contributed all various of high-performance photodetectors. [18][19][20][21][22][23][24][25] For OIHP photodetectors, excellent performance parameters including responsivity…”