The broadband organic photodetectors (OPDs) with photomultiplication (PM) phenomenon are fabricated by using Y6 doped with rather less PBDB-T as active layers having electron-only transport characteristic. The PM-OPDs with PBDB-T:Y6 (3:100, wt/wt) as active layers exhibit the external quantum efficiency (EQE) of 18,000% at 350 nm and 15,000% at 870 nm under 1 V bias. The PM-OPDs exhibits a broad spectral response range from 320 to 950 nm, which is mainly determined by the trapped hole distribution near Al electrode. The working mechanism of PM-OPDs should be attributed to interfacial trap-assisted electron tunneling injection, which can be further confirmed from the EQE spectral shape of PM-OPDs with different active layer thickness. The n-type polymer PZ1 was selected as interfacial layer to be inserted between PEDOT:PSS and active layers, which makes PM-OPDs with PZ1 interfacial layer work well under forward and reverse bias. This work may provide a smart strategy to achieve broadband PM-OPDs by adjusting the distribution of trapped charge near electrode.

通过使用掺有较少PBDB-T的Y6作为具有纯电子传输特性的有源层，可以制造出具有光电倍增（PM）现象的宽带有机光电探测器（OPD）。以PBDB-T：Y6（3：100，wt / wt）作为活性层的PM-OPD在1 V偏压下在350 nm处的外部量子效率（EQE）为18,000％，在870 nm处的外部量子效率（EQE）为15,000％。PM-OPD的光谱响应范围在320至950 nm之间，这主要取决于Al电极附近的陷获空穴分布。PM-OPDs的工作机理应该归因于界面陷阱辅助电子隧穿注入，这可以从具有不同活性层厚度的PM-OPDs的EQE光谱形状中进一步证实。该ñ选择P型聚合物PZ1作为界面层插入PEDOT：PSS和活性层之间，这使得具有PZ1界面层的PM-OPD在正向和反向偏压下都能很好地工作。这项工作可以通过调整电极附近的捕获电荷分布来提供实现宽带PM-OPD的明智策略。