Metal oxide of molybdenum oxide (MoO₃) and polyethyleneimine ethoxylated (PEIE) was introduced into polymer solar cells (PSCs) as a double interfacial layer. A high power conversion efficiency (PCE) of 3.69% based on poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PC61BM) was obtained using a MoO₃/PEIE bilayer, which is 19.4% higher than that of the pristine devices (the PCE of pristine devices with PEIE interface layer is 3.09%). Results of the analysis via X-ray photoelectron spectroscopy indicated that the MoO₃/PEIE bilayer has dual functions. The first function is that MoO₃ is successfully transformed into MoO₂, enhancing charge transporting. The second function is that the combination of molybdenum oxide and PEIE can be effectively form ohmic contact to reduce interface contact resistance. The measurement of electrochemical impedance and conductivity further illustrated that the MoO₃/PEIE double interfacial layer effectively reduced interface contact resistance, promoted charge transport, and enhanced electron transport ability, thereby improving the device performance.

将氧化钼 (MoO ₃ ) 和聚乙烯亚胺乙氧基化 (PEIE) 的金属氧化物引入聚合物太阳能电池 (PSC) 作为双界面层。使用 MoO ₃ /PEIE 双层获得基于聚（3-己基噻吩）和 [6,6]-苯基-C61-丁酸甲酯（P3HT：PC61BM）的高功率转换效率 (PCE)，为 3.69% ，比原始器件高 19.4%（具有 PE​​IE 界面层的原始器件的 PCE 为 3.09%）。X射线光电子能谱分析结果表明MoO ₃ /PEIE双层具有双重功能。第一个作用是将 MoO ₃成功转化为 MoO ₂，增强电荷传输。第二个作用是氧化钼与PEIE的结合，可以有效形成欧姆接触，降低界面接触电阻。电化学阻抗和电导率的测量进一步说明MoO ₃ /PEIE双界面层有效降低了界面接触电阻，促进了电荷传输，增强了电子传输能力，从而提高了器件性能。