Abstract In the quest to improve the optical absorption and electrical transport of poly-3-hexylthiophene (P3HT) and (6-6) phenyl-C61-butyric acid methyl ester (PCBM) blend film, reduced graphene oxide-germanium dioxide nanocomposite (rGO-GeO2) was employed in the photoactive layer of thin film organic solar cells. Bulk heterojunction solar cells (BHJ SCs) with rGO-GeO2 composite in the active layer exhibited an increase in power conversion efficiency (PCE) of up to 53%. Significant improvement in the measured photocurrent is achieved by the incorporation of rGO-GeO2 in the active layer. High short-circuit current density (Jsc) of up to 17 mA/cm2 is attained in the BHJ SCs. The high Jsc shows that the inlay of rGO-GeO2 in the active layer facilitates exciton separation and creates percolation pathways for charge transport to the electrodes. Charge separation is energetically favoured by a built-in potential difference between the donor and acceptor phases of the active layer. Hence, the incorporation of rGO-GeO2 composite in the active layer improves its charge photogeneration, separation and transport to yield high Jsc and enhanced PCE.

中文翻译：

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改善体异质结太阳能电池的短路电流密度，在光敏层中减少氧化石墨烯-二氧化锗纳米复合材料

摘要 为了改善聚 3-己基噻吩 (P3HT) 和 (6-6) 苯基-C61-丁酸甲酯 (PCBM) 共混膜的光吸收和电传输，还原氧化石墨烯-二氧化锗纳米复合材料 (rGO) -GeO2) 用于薄膜有机太阳能电池的光敏层。在活性层中具有 rGO-GeO2 复合材料的体异质结太阳能电池 (BHJ SCs) 表现出高达 53% 的功率转换效率 (PCE) 增加。通过在有源层中加入 rGO-GeO2，可以显着提高测量的光电流。BHJ SC 实现了高达 17 mA/cm2 的高短路电流密度 (Jsc)。高 Jsc 表明活性层中的 rGO-GeO2 嵌体促进了激子分离，并为电荷传输到电极创造了渗透路径。活性层的施主相和受主相之间的内置电位差在能量上有利于电荷分离。因此，在活性层中加入 rGO-GeO2 复合物可改善其电荷光生、分离和传输，以产生高 Jsc 和增强的 PCE。