Effect of MoO₃ HTL on the Performance of ITO/ZnO CQDs/F8BT:TIPS-Pentacene/MoO₃/Ag UV-Visible Photodetector

The n-type zinc oxide (ZnO) colloidal quantum dots (CQDs) and p-type blended poly(9,9-dioctylfluorene-alcohol-benzothiadiazol) (F8BT):6,13-bis (tri-isopropyl-silylethynyl) pentacene (TIPS-P) nanocomposite-based heterojunction fabricated on indium tin oxide (ITO)-coated substrate are explored for ultraviolet (UV)-visible photodetection. The effect of MoO
₃
hole-transporting layer (HTL) on the performance of the proposed ITO/ZnO CQDs/F8BT:TIPS-P/MoO
₃
/Ag photodetector structure has been investigated. Under -1 V reverse bias, the maximum responsivity and specific detectivity were improved in the UV region from 29.60 to 70.20 A/W and from
$6.35\times 10^{{12}}$
Jones to
$3.97\times 10^{{13}}$
Jones at ~385 nm (
$17.43~\mu $
W/cm
²
intensity), respectively, by using the MoO
₃
HTL in the device. On the other hand, the maximum responsivity and specific detectivity were improved, respectively, from 13.68 to 40.92 A/W and from
$2.93\times 10^{{12}}$
to
$2.08\times 10^{{13}}$
Jones in the visible region at 470 nm (
$35.94~\mu $
W/cm
²
intensity) due to the use of the MoO
₃
HTL under -1 V reverse bias.