Perovskite single crystals (PSCs) are intriguing choices for various optoelectronic device applications, such as photo-detectors, solar cells, and LEDs. Triple-cation mixed-halide perovskites exhibit better (phase, thermal, and environmental) stability, then the traditional perovskites based on single cation, and single halide anion. In this work, novel triple-cation mixed-halide PSCs, i.e., FA 0.85 MA 0.10 Cs 0.05 Pb(I 0.95 Br 0.05 ) 3 was synthesized via ACN antisolvent additive-based inverse temperature crystallization (ITC) and its wavelength-dependent photoresponse was investigated. The PSCs exhibited a bandgap energy of 1.45 eV, with a strong photoluminescence emission peak. The crystallinity and morphology of the PSCs were investigated using an X-ray diffractometer (XRD), and scanning electron microscopy (SEM). The PSCs photodetector demonstrated remarkable responsivity of 11.77 and 7.62 × 10 11 detectivity at 532 nm. Photocurrent measurements were performed using lasers with wavelengths 532 nm and 376 nm. Under bias voltage applied, the 532 nm laser generated a maximum current of 113 µA, demonstrating superior performance compared to reported photodetectors based on PCSs and perovskite thin films. Collectively, this work opens up a new avenue for enhanced photosensitive photodetectors based on PSCs.
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Gupta et al. (2025) studied this question.
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