A research team at the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences has fabricated a sensitive photodetector based on lead-free perovskite single crystals.

Chinese team develops lead-free perovskite photodetector image

"We have developed a high performance photodetector based on MA3Sb2I9 microsingle crystals (MSCs)," said Prof. HAN. Scientists found that MA3Sb2I9 single crystals exhibited a low trap-state density of ~1010 cm-3, high carrier mobility of 12.8 cm2 V-1 s-1 and long carrier diffusion length reaching 3.0 μm.

The responsivity of MA3Sb2I9 single crystal photodetectors can reach to 40 A/W for monochromatic light (460 nm). In addition, the photodetector shows fast response time (<1 ms), which corresponds to both high gain and gain-bandwidth product.