2D Layered (CH₃NH₃)₃Sb₂Cl_xI< sub>9-x Lead-Free Perovskite for Weak Light Detection

Weak light detection is a current research topic and chlorine-containing lead-free perovskite materials are promising. In this research work, Cl-incorporated methylammonium Sb mixed halide perovskite (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X) derivatives were investigated for weak light detection. We have devised a solution-processable slow crystal growth (SCG) to fabricate 2D layered (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X) lead-free perovskite microcrystals. SCG facilitate only 1.51 atomic percent chlorine incorporation confirmed in FESEM-EDS analysis and band gap 1.98 eV determines the SCG grown lead-free perovskite molecular formula to be (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X). FTO/ (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X) PMCs/FTO self-powered photodetector detect 400 nm, 1 mu W cm(-2) weak optical signal. (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X) respond to weak optical signals in the 300-600 nm wavelength range. Also, (CH3NH3)(3) (Sb)(2)(Cl)(X) I(9-X) exhibit a high reflectance (> 70%) for the wavelength above 600 nm with its inherent thermodynamic stability is a candidate for use as a reflective layer in tandem solar cells. [GRAPHICS] .