Highly Crystallized Tin Dioxide Microwires toward Ultraviolet Photodetector and Humidity Sensor with High Performances

Abstract

AbstractThe rapid development of artificial intelligent and internet of things calls for high‐performance multifunctional devices for synchronous detection of a wide variety of environmental signals, such as gas, light, and humidity. Herein, highly crystallized tin dioxide (SnO2) microwires (MWs) with low density of point defects are synthesized by the chemical vapor deposition method and constructed into a multifunctional device for photo and humidity sensing. The device shows excellent photoelectric performances, for example, ultralow dark current of ≈10−13 A, ultrahigh on–off ratio of >107, UV/visible rejection ratio of R300 nm/R400 nm > 107, specific detectivity (D*) of 1.16 × 1015 Jones, linear dynamic range (LDR) of 152 dB, high responsivity of 18 A W−1, and fast photoresponse speed of trise/tdecay = 2.7 µs/2.5 ms at 5 V bias. Furthermore, the p‐CuI/n‐SnO2 heterojunction shows outstanding self‐powered properties, such as responsivity of 8.98 mA W−1, specific detectivity of 1.98 × 1012 Jones and LDR of 106 dB at 0 V bias. Additionally, the SnO2 MWs also show high sensitivity to ambient humidity changes. Therefore, the SnO2 MWs show high potential for multifunctional applications, such as UV photodetector and humidity sensor.