The improvement in current density–voltage characteristics and external quantum efficiency of organic photovoltaics with non-toxic polyethylenimine ethoxylated (PEIE) as a modified layer between the electron transport layer and the active layer were demonstrated. The mechanisms of carrier transport, photon generation current, and the carrier recombination influenced by the PEIE layer were systematically studied. An extra PEIE layer was demonstrated having a shorter relaxation time via pump-probe spectroscopy, which provides better charge transfer ability. From capacitance-voltage measurement, the effective capacitance of the device increase with an addition PEIE layer, corresponding to the increase of accumulation carriers generated at the interfaces. Furthermore, electrochemical impedance spectroscopy elucidated that the PEIE layer can reduce the carrier recombination probability in the devices. As a result, the lifetime of the devices with a PEIE layer is improved as compared to the devices without PEIE layer.

证明了使用无毒聚乙烯亚胺乙氧基化 (PEIE) 作为电子传输层和活性层之间的改性层的有机光伏的电流密度 - 电压特性和外部量子效率的改善。系统研究了PEIE层对载流子传输、光子产生电流和载流子复合的影响机制。通过泵浦探测光谱证明额外的 PEIE 层具有更短的弛豫时间，这提供了更好的电荷转移能力。从电容-电压测量来看，器件的有效电容随着额外的 PEIE 层而增加，对应于界面处产生的累积载流子的增加。此外，电化学阻抗谱阐明PEIE层可以降低器件中的载流子复合概率。因此，与没有 PEIE 层的器件相比，具有 PE​​IE 层的器件的寿命得到改善。