High Responsivity ZnO Nanorods/PTB7 Polymer Heterojunction Based UV-Visible Photodetector

This letter reports the fabrication and characterization of a ZnO nanorods / p-type poly[[4,8-bis [(2 ethylhexyl) oxy] benzo [1,2-b:4,5- $\text{b}'$ ]dithiophene-2,6-diyl][3-fluoro-2-[(2ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]](PTB7) polymer hybrid heterojunction based high performance ultraviolet-visible (UV-Vis) wideband photodetector. Under a low bias voltage of −1 V, the device shows the responsivities, detectivities and external quantum efficiencies (EQEs) measured at 380 nm (UV) and 640 nm (visible) wavelengths are ~307.18 A/W and ~33.64 A/W; $\sim 1.56\times 10$ ¹³ Jones and $\sim 1.7\times 10 ^{12}$ Jones; and $\sim 100.23\times 10 ^{3}$ % and $\sim 6.51\times 10$ ³ % respectively.