Photon harvesting by the active layers of bulk heterojunction (BHJ) polymer solar cells (PSCs) greatly influences the power conversion efficiency (PCE) of the devices. Inclusion of novel metal nanostructures in photoactive layers is one of the effective ways to enhance light trapping without increasing the device thickness. Here, we demonstrate a dramatic enhancement (up to 43%) of the power conversion efficiency (PCE) by exploiting gold nanostructures (AuNSs)-embedded graphene oxide (GO) as the hole transporting layer (HTL) in BHJ PSCs. The enhancement of the device performance could be attributed to the increase in both short circuit current density (J_sc) and fill factor (FF). The increased FF is most likely the result of the enhanced charge collection through modified HTL and anode contact. Furthermore, the optical properties of the photovoltaic devices suggest that AuNSs cause light trapping via plasmonic effects resulting enhanced J_sc.

本体异质结（BHJ）聚合物太阳能电池（PSC）的有源层收集的光子极大地影响了器件的功率转换效率（PCE）。在光敏层中包含新颖的金属纳米结构是在不增加器件厚度的情况下增强光捕获的有效方法之一。在这里，我们通过利用金纳米结构（AuNSs）嵌入的氧化石墨烯（GO）作为BHJ PSC中的空穴传输层（HTL），证明了功率转换效率（PCE）的显着提高（高达43％）。器件性能的提高可归因于短路电流密度（J _sc）和填充因子（FF）。FF的增加很可能是通过改良的HTL和阳极接触增强了电荷收集的结果。此外，光伏装置的光学性质表明，AuNS通过等离激元效应引起光陷阱，从而导致J _sc增强。