Broad-Band Photodetectors Based on Copper Indium Diselenide Quantum Dots in a Methylammonium Lead Iodide Perovskite Matrix

Abstract

Low-temperature solution-processed methylammonium lead iodide (MAPbI 3 ) crystalline films have shown outstanding performance in optoelectronic devices. However, their high dark current and high noise equivalent power prevent their application in broad-band photodetectors. Here, we applied a facile solution-based antisolvent strategy to fabricate a hybrid structure of CuInSe 2 quantum dots (CISe QDs) embedded into a MAPbI 3 matrix, which not only enhances the photodetector responsivity, showing a large on/off ratio of 10 4 at 2 V bias compared with the bare perovskite films, but also significantly (for over 7 days) improves the device stability, with hydrophobic ligands on the CuInSe 2 QDs acting as a barrier against the uptake of environmental moisture. MAPbI 3 /CISe QD-based lateral photodetectors exhibit high responsivities of >0.5 A/W and 10.4 mA/W in the visible and nearinfrared regions, respectively, partly because of the formation of a type II interface between the respective semiconductors but most significantly because of the efficient trap-state passivation of the perovskite grain surfaces, and the reduction in the twinning-induced trap density, which stems from both CISe QDs and their organic ligands. A large specific detectivity of 2.2 × 10 12 Jones at 525 nm illumination (1 μW/cm 2 ), a fast fall time of 236 μs, and an extremely low noise equivalent power of 45 fW/Hz 1/2 have been achieved.

A novel approach for designing efficient broadband photodetectors expanding from deep ultraviolet to near infrared

“…The increase of the radiative decay rate in CsPbI 3 :Er 3+ (7.7%) PQDs can be proved by the decreased power index as a function of the excitation power density (Fig. S10 ) 51 .…”

Broadband Antireflection with Halide Perovskite Metasurfaces

“…Also, perovskite broad-band photodetectors can be substantially improved with the proposed antireflective coatings. [41] Finally, the proposed design of anti-reflecting perovskite metasurfaces can be up-scaled by both mechanical nanoimprint [3,39] and laser printing [8,40] technologies.…”

Recent Progress on the Performance of Lead‐Based Halide Perovskite APbX3 Detectors

“…Visible-light photodetectors (PDs) are widely used in optical communications, remote sensing, digital imaging, environmental monitoring, and other fields. [35][36][37][38][39] In recent years, the research results of all-inorganic lead-based halide perovskites in PDs have been reported many times due to their excellent merits such as tunable bandgap, well-balanced electron/hole mobilities, low-cost processing technique, and good stability. [40][41][42][43] Li et al have synthesized a dense structure of CsPbBr 3 thin films on SiO 2 /Si substrates by one-step spin-coating method.…”