Giant Two‐Photon Absorption in Mixed Halide Perovskite CH₃NH₃Pb_0.75Sn_0.25I₃ Thin Films and Application to Photodetection at Optical Communication Wavelengths

Photodetection in the optical communication wavelength band (OCWB) is a key technique for data processing communications. Photodetectors with integrability, ease of fabrication, low cost, and excellent detection properties are favorable for practical applications. Metal halide perovskite thin films have exhibited intriguing optoelectronic properties. However, their relatively wide intrinsic band gaps indicate that direct photodetection in the...