Space‐Confined Growth of CsPbBr₃ Film Achieving Photodetectors with High Performance in All Figures of Merit

Abstract

All-inorganic halide perovskite is considered as outstanding candidate of organic-inorganic hybrid perovskite due to its superior stability. However, the low solubility of precursor and uncontrollable film growth result in poor film quality and impede the application of polycrystalline films greatly. In this work it is reported on a space-confined growth strategy to overcome the low solubility and fast crystal growth disadvantages via freezing the precursor solution within the gaps of ordered polystyrene sphere templates. Then, the dense CsPbBr 3 polycrystalline films realize low trap density (3.07 × 10 12 cm −3 ) and high carrier mobility (9.27 cm 2 V −1 s −1 ) after stoichiometric modulation. Photodetectors based on these films exhibit high performance in all figures of merit. Specifically, high responsivity up to 216 A W −1 and ultrashort response time (<5 µs) are achieved, which are better than those of all the CsPbBr 3 based PDs. A record detectivity of 7.55 × 10 13 and 3.1 × 10 5 Hz −3 dB bandwidth are also achieved. This work opens the window of high quality all-inorganic halide perovskite polycrystalline films and can be extended to rational application of more optoelectronic devices including solar cells, photoelectrodes, and ray detectors.

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

“…C, Calculated responsivity and D, detectivity at a bias of 5 V. E, Power‐dependent photocurrent of photodetectors based on CsPbBr 3 IO film (PbBr 2 :CsBr = 1.2) under a bias of 5 V. F, −3 dB bandwidth of the photodetector at 1 V bias voltage. Source : Reproduced with permission from Reference Copyright 2018, John Wiley and Sons…”

“…65 The recent advancements and applications on film photodetectors and the tactics of achieving high-quality film in photodetectors based on space-confined growth are summarized: Zeng et al reported space-confined growth tactics to surmount above-mentioned obstacle and realized a faster response speed. 66 The specific process of this strategy is shown in Figure 14. An ordered polystyrene (PS) sphere template was firstly fabricated.…”

Bromine Vacancy Redistribution and Metallic‐Ion‐Migration‐Induced Air‐Stable Resistive Switching Behavior in All‐Inorganic Perovskite CsPbBr3 Film‐Based Memory Device

“…[1][2][3] The RRAM device, with sandwich structure of top metal (TE)/ switching layer/bottom metal (BE), can be switched between a low resistance state (LRS) and high resistance state (HRS) under the stimulation of different voltage amplitudes or polarities. [8] In recent years, halide perovskites, with formula of ABX 3 (A = CH 3 NH 3+ , CH(NH 2 ) 2+ , Cs + ; B = Pb 2+ , Sn 2+ ; X = Cl − , Br − , I − ), have attracted intensive attention due to their huge potential applications in industrial applications, such as solar cells, [9] photodetectors, [10] light emitting diodes, [11] lasers, [12] and RS memory devices. However, the perovskite oxide-based RRAM devices are limited by several disadvantages, such as high processing temperature and rigid ceramic property of the switching layer.…”

Layered‐Perovskite Nanowires with Long‐Range Orientational Order for Ultrasensitive Photodetectors

“…[1][2][3][4][5] Compared to their 3D counterparts, these layered materials offer confined photocarriers, high-rate excitonic recombination, and enhanced environmental stability, which introduce core opportunities for realizing efficient and stable light-emitting diodes (LEDs), lasers, photodetectors, and solar cells. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] by chemical vapor deposition on epitaxial substrate. [32][33][34][35] For example, Jin and his colleagues developed epitaxial growth of single-crystalline perovskite structures on mica and SrTiO 3 substrates.…”