High-Detectivity and Stable Planar MAPbI₃/IDT-BT Photodetectors With Assisted MoO₃ Interlayer

Composited with electronic functional materials is an effective way to improve the performance and stability of organic–inorganic hybrid halide perovskite photodetectors. Herein, a planar photoconductive photodetector based on a CH
₃
NH
₃
PbI
₃
(MAPbI
₃
)/IDT-BT/MoO
₃
structure was designed and fabricated. Indacenodithiophene-co-benzothiadiazole (IDT-BT) and MoO
₃
layers are beneficial for photogenerated holes transmission and improve the dissociation efficiency of photogenerated electron–hole pairs. On the other hand, MoO
₃
as an electron-blocking layer can suppress the dark current. The device displays a fast response time of less than 7 ms, a high responsivity of 11.6 AW
⁻¹
, and an ultrahigh detectivity up to
$5.2\times10$
¹³
Jones. In addition, the IDT-BT layer can isolate MAPbI
₃
from oxygen and water, thus increasing the stable lifetime of devices to more than 20 days. These parameters are several times higher than pristine MAPbI
₃
photoconductive photodetectors. These results can offer a feasible and effective method for integrating the composite material to improve the performance of perovskite-based devices.