The heterojunction photodetector between n-SrTiO3(n-STO)and p-CuS-ZnS(p-CZS)is prepared by a simple chemical bath deposition.The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm l...The heterojunction photodetector between n-SrTiO3(n-STO)and p-CuS-ZnS(p-CZS)is prepared by a simple chemical bath deposition.The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm light illumination,including high photosensitivity(on/off ratio of 300),fast response speed(0.7/94.6 ms),and good wavelength selectivity(410-380 nm).More importantly,the self-powered n-STO photodetectors can be regulated by varying the composition of CZS film(p-CZS,p-CuS,and n-ZnS).All devices exhibit a large opencircuit voltage and show different self-powered behaviors because of the different built-in electric fields.The open-circuit voltages of the CZS/STO,CuS/STO,and ZnS/STO devices are measured to be 0.56,0.30,and 0.35 V,respectively.This work provides a simple and effective way to fabricate tunable self-powered photodetectors by varying the composition of the nanocomposite film.展开更多
基金This work was supported by National Natural Science Foundation of China(51872050,11674061,and 11811530065)Science and Technology Commission of Shanghai Municipality(18520744600,18520710800,and 17520742400)the Ministry of Education Joint Fund for Equipment Pre-Research(6141A02033241).
文摘The heterojunction photodetector between n-SrTiO3(n-STO)and p-CuS-ZnS(p-CZS)is prepared by a simple chemical bath deposition.The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm light illumination,including high photosensitivity(on/off ratio of 300),fast response speed(0.7/94.6 ms),and good wavelength selectivity(410-380 nm).More importantly,the self-powered n-STO photodetectors can be regulated by varying the composition of CZS film(p-CZS,p-CuS,and n-ZnS).All devices exhibit a large opencircuit voltage and show different self-powered behaviors because of the different built-in electric fields.The open-circuit voltages of the CZS/STO,CuS/STO,and ZnS/STO devices are measured to be 0.56,0.30,and 0.35 V,respectively.This work provides a simple and effective way to fabricate tunable self-powered photodetectors by varying the composition of the nanocomposite film.
