倍增型有机光电探测器(PM-OPDs)作为一种光电转换器件在多领域有着重要的应用。本文以宽带隙聚合物PBDB-T作为大比例给体材料，窄带隙小分子COTIC-4F作为受体材料制备空穴传输型PM-OPD。少量的COTIC-4F作为电子陷阱捕获电子诱导界面弯曲，引起空穴隧穿注入，空穴沿着PBDB-T形成的通道有效运输，实现光电倍增现象。对器件进行外量子效率、紫外-可见光谱、J-V曲线、响应时间等性能测试，以PBDB-T:COTIC-4F(100:15,wt/wt)作为活性层的PM-OPD在+3V偏压下，最高表现出近300%的外量子效率(EQE)。窄带隙材料COTIC-4F在实现PM现象及扩大光谱响应范围至近红外区域中起着至关重要的作用。

Photomultiplication type organic photodetectors (PM-OPDs) have important applications in multiple fields as a photoelectric conversion device. In this article, the broad bandgap polymer PBDB-T is used as a large scale donor material and the narrow bandgap small molecule COTIC-4F is used as an acceptor material to prepare a hole transport type PM-OPD. The low amount of COTIC-4F will become electron traps and trap electrons to induce interfacial band bending and cause hole tunneling injection. So that the holes are effectively transported along the channel formed by PBDB-T to realize the photoelectric multiplication phenomenon. The devices were tested for external quantum efficiency (EQE), UV-Vis spectra, J-V curves, response time, etc. The PM-OPD with PBDB-T:COTIC-4F (100:15, wt/wt) as the active layer exhibited the highest external quantum efficiency (EQE) of nearly 300% at +3V bias. The narrow bandgap material COTIC-4F plays an vital role in realizing the PM phenomenon and extending the spectral response range to the near-infrared region.