Triple (FAMACs) cation perovskite single crystal for enhanced photosensitive properties of photodetectors

• Triple-cation mixed-halide PSCs (FA 0.85 MA 0.10 Cs 0.05 Pb(I 0.95 Br 0.05 ) 3 ) show improved stability (phase, thermal, and environmental) compared to traditional single-cation perovskites. • The PSCs were synthesized using ACN antisolvent additive-based inverse temperature crystallization (ITC) , with their wavelength-dependent photoresponse being thoroughly investigated. • The PSCs exhibited a bandgap energy of 1.45 eV , a strong photoluminescence emission peak, and were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM) . • Photodetector performance showed remarkable responsivity (11.77) and detectivity (7.62 × 10 ^11 ), with the 532 nm laser generating a maximum current of 113 µA , outperforming other perovskite-based photodetectors. 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.