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2D Layered (CH3NH3)3Sb2ClxI9−x Lead-Free Perovskite for Weak Light Detection.

Authors :: Pathak, Amit Kumar
Mukherjee, Sudip
Batabyal, Sudip K.
Source :: Electronic Materials Letters; Jul2024, Vol. 20 Issue 4, p425-431, 7p
Publication Year :: 2024
Abstract: 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 (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript> derivatives were investigated for weak light detection. We have devised a solution-processable slow crystal growth (SCG) to fabricate 2D layered (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript> 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 (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript>. FTO/ (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript> PMCs/FTO self-powered photodetector detect 400 nm, 1µW cm<superscript>−2</superscript> weak optical signal. (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript> respond to weak optical signals in the 300–600 nm wavelength range. Also, (CH<subscript>3</subscript>NH<subscript>3</subscript>)<subscript>3</subscript> (Sb)<subscript>2</subscript>(Cl)<subscript>X</subscript> I<subscript>(9−X)</subscript> 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. [ABSTRACT FROM AUTHOR]