▎ 摘　　要

Self-powered broadband photodetector was fabricated using PbS/CdS-decorated TiO2 nanorods (NRs). TiO2 NRs were grown using hydrothermal method and CdS/PbS layers were deposited by chemical bath deposition process. Metal-free top electrode of the photodetector was prepared using chemically reduced graphene oxide (rGO). PbS/CdS-decorated TiO2 NRs based photodetector showed significant photocurrent over broad spectral range. The maximum responsivity (R-lambda) and detectivity (D-lambda) of the photodetector at zero bias was obtained, similar to 0.34 A W-1 and similar to 162742.42 Hz(1/2) W-1, respectively, at 400 nm. TiO2/CdS/PbS/rGO device showed sharp rise and decline of photocurrent under ON/OFF of white light. This device also demonstrated excellent self-powered nature with open circuit voltage similar to 0.40 V, short circuit current similar to 0.077 mA and power conversion efficiency similar to 0.16%.