Performance Enhancement of High-speed Self-driving Photodetectors Based on ZnxMg1-xO Quantum Dots by Boric Acid Solution Treatment
Zinc oxide nanomaterials(ZnO)hold tremendous potential in the field of self-powered photodetection due to their unique physical and chemical properties.However,self-powered photodetectors based on ZnO nanomate-rials currently face challenges such as complex structures,slow response speed,low responsivity and detectivity etc.,making it difficult to meet practical application requirements.In this study,simple structured ITO/ZnO quan-tum dots(QDs)/Au photodetectors with fast response speed were fabricated.A surface treatment process combining boric acid(BA)surface treatment with annealing was carried out,which successfully reduced the surface state densi-ty in ZnO quantum dot films and increased the device's detectivity by approximately an order of magnitude.The rise and fall time of the device at 0 V were 1.29 ms and 1.31 ms,respectively,achieving an on/off ratio of 10⁴ and a re-sponsivity as high as 8.81 mA/W.Applying this process to bandgap-tunable Mg²⁺-doped quantum dot-based photode-tectors similarly improved the detectivity and responsivity of the devices.A high-response-speed self-powered photo-detector with a rise time of 0.93 ms was obtained,and as the Mg doping concentration increased,the rise time of the device decreased.This work demonstrates that the combined BA surface treatment with annealing process significant-ly enhances the performance of chemically synthesized ZnO materials,with potential widespread application in per-formance optimization of photodetectors based on ZnO nanomaterials.
万方数据
