Solution‐Processing of CsPbCl_xBr_3−x Perovskite Micro/Nanostructure Near‐Ultraviolet Photodetectors with High Performance

Abstract

Lead halide perovskite materials have shown great application potential in the field of optoelectronics, but solution‐phase processing of all‐inorganic wide‐bandgap perovskite materials, especially CsPbCl3, faces great challenges due to the low solubility of the raw materials. Here, a solution‐processing of CsPbClxBr3−x perovskite micro/nanostructures (PMNSs) via a two‐step ion‐exchange method is reported. The halide composition and the surface morphology of the CsPbClxBr3−x PMNS are regulated by tailoring the reaction time of halide exchange, and the photodetectors (PDs) based on the CsPbBr2.25Cl0.75 PMNS exhibit best device performance. The CsPbBr2.25Cl0.75 PMNS PDs show excellent self‐powered performance with an open‐circuit voltage of 1.1 V, an on‐off ratio of up to 106, a responsivity of 0.31 A W−1, a detectivity of 2.87 × 1012 Jones, and a linear dynamic range of 130 dB. These excellent performances are attributed to the unique device structure in which large‐sized micro‐nanocrystals in the bottom layer guarantee the generation of carriers, and the nanowires on top penetrate the carbon and benefit from excellent contact between the perovskite and the electrode, thus resulting in a good device performance.

Ultrafast self-powered CsPbCl3ultraviolet photodetectors with choline chloride for surface passivation and charge transport regulation

“…2 Vacuum thermal evaporation and halide exchange methods were successively proposed to fabricate high-quality CsPbCl 3 films for use in UV detection. [1][2][3][26][27][28][29] Nevertheless, since the nucleation and crystal growth processes of the CsPbCl 3 perovskites in these methods can be hardly controlled, there exist many intrinsic defects (interstitials, halide vacancies, antisites and grain boundary defects) or impurities in the resultant films. These bulk and surface defects tend to provoke undesired nonradiative and interfacial carrier recombinations, 30 impeding the performance enhancement of the self-driven CsPbCl 3 photodetectors and thus their commercialization.…”

Self-Powered Photodetector Based on Ag/CH3NH3PbI3/C Asymmetric Dual-Terminal Device

“…One of these fields is to develop high-performance photodetectors by utilizing cost-effective materials. Additionally, the miniaturization and portability of electronic devices have led to the demand for self-powered photodetection systems capable of operating under passive conditions. , To meet the requirement, harnessing renewable energy from the surroundings has emerged as a potential solution. − Among the energy harvesting technologies, one-dimensional (1D) nanostructures have gained prominence due to their simple structure and abundant surface states. , They have shown exceptional performance as photoactive layers, highlighting their potential in photodetection applications. − …”

Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals

“…There is also an increasing number of studies considering photoconductive perovskite-containing materials as elements of artificial synapses [ 40 , 41 , 42 , 43 , 44 ]. The published results on the effect of perovskite nanocrystals on the photoconductivity of ZnO mainly concern monohalide perovskites with an organic [ 45 , 46 , 47 , 48 , 49 ] or inorganic cation [ 4 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ], while the use of mixed halide perovskites as sensitizers use is also discussed in the literature [ 44 , 58 , 59 , 60 ], however has not been systematically studied so far.…”