Two-dimensional perovskite Sr2Nb3O10 nanosheets meet CuZnS film: Facile fabrications and applications for high-performance self-powered UV photodetectors

Abstract

Two-dimensional perovskite Sr 2 Nb 3 O 10 (SNO) nanosheets were synthesized using a typical calcination-exfoliation method. SNO nanosheets were then directly coated on the CuZnS film to construct a p-n heterojunction responsive in ultraviolet region. The as-integrated CuZnS/SNO device achieves a maximum responsivity of 14.8 mA/W and detectivity of 1.87 × 10 11 Jones at 3 V and 300 nm, greatly exceeding pure SNO. In particular, the hybrid photodetector can steadily operate at zero bias with high on/off ratio (>3000) and fast response speed (1.1/7.9 ms), which is primarily ascribed to the efficient separation of photoinduced electron-hole pairs driven by the built-in electric field at the p-n junction interface. Moreover, the device exhibits decent responsivity (0.28 mA/W), good detectivity (4.61 × 10 10 Jones), high spectral selectivity ( R 300 /R 400 = 2500), and wide linear dynamic range (59 dB) at 0 V, showcasing excellent self-powered features at 300 nm. This work strongly provides a promising avenue for developing high-performance self-powered ultraviolet photodetectors for practical applications. • First use of 2D Sr 2 Nb 3 O 10 (SNO) nanosheets for p-n heterojunction devices via a facile and low-cost manufacturing process. • CuZnS/SNO devices exhibit enhanced photoelectric performance, especially exceeding 2500% in responsivity compared with SNO. • Fast response (1.1/7.9 ms) and wide linear dynamic range (59 dB) at 0V show excellent self-powered features at 300 nm. • The self-powered behavior of CuZnS/SNO PDs benefits from built-in field at p-n junction interface.