A simple yet effective method based on methanol treatment is proposed to enhance the external quantum efficiency (EQE) of the photomultiplication type organic photodetector with a structure of Glass/ITO/PEDOT:PSS/P3H:PC₇₁BM (100:1, wt./wt.)/Al. By modifying the PEDOT:PSS film surface with methanol, the EQE of photodetector significantly improved within a broad wavelength range of 300–700 nm. The maximum EQE of 25300% occurs at the wavelength of 350 nm in the methanol-treated device under −9 V bias, which more than doubles that (11500%) of the device without treatment. In addition, as a result of the methanol treatment, the detectivity of the device improved from 3.72 × 10¹² to 7.24 × 10¹² Jones at −9 V under 350 nm light illumination. The large improvement is attributed to the fact that the methanol treatment can improve the electrical performance of the PEDOT:PSS by removing the insulator PSS within the film and also result in PC₇₁BM aggregations in the active layer. The latter can enhance the tunneling hole injection by the intensified energy-level bending, which is induced by both the trapped electrons in these aggregations and accumulated ones near Al electrode. As a result, the modification of both the PEDOT:PSS layer and the active layer increases the response current, resulting in the EQE improvement.

提出了一种基于甲醇处理的简单而有效的方法来提高具有 Glass/ITO/PEDOT:PSS/P3H:PC ₇₁ BM (100:1, wt. /重量。）/铝。通过用甲醇改性 PEDOT:PSS 薄膜表面，光电探测器的 EQE 在 300-700 nm 的宽波长范围内显着提高。25300% 的最大 EQE 发生在 350 nm 波长处，在 -9 V 偏压下，甲醇处理的器件是未经处理的器件 (11500%) 的两倍多。此外，由于甲醇处理，装置的检测率从3.72×10 ¹²提高到7.24×10 ¹²在 350 nm 光照下 -9 V 的琼斯。巨大的改进归因于这样一个事实，即甲醇处理可以通过去除薄膜内的绝缘体 PSS 来提高 PEDOT:PSS 的电性能，并且还会导致活性层中的 PC ₇₁ BM 聚集。后者可以通过增强的能级弯曲来增强隧道空穴注入，这是由这些聚集体中的俘获电子和铝电极附近积累的电子引起的。因此，对 PEDOT:PSS 层和有源层的修改都增加了响应电流，从而改善了 EQE。