| 초록 |
A high performance photomultiplication-type organic photodetector (PM-OPD) using a bulk heterojunction (BHJ) of donor and acceptor materials and a core-shell quantum dot (QD) interlayer is demonstrated. The PM-OPD shows high specific detectivity, external quantum efficiency (EQE), and bandwidth resulting in large EQE-bandwidth product (＞105 Hz). This performance is enabled by the novel device structure (ITO/ZnO/donor-acceptor BHJ/QD/Ag), where fast charge trapping of electrons at the QD interlayer induced fast charge injection from the electrodes. This work offers new insights on device structure for high-performing PM-OPDs and provides comprehensive understanding of underlying device physics. |
