阳极缓冲层修饰对聚合物太阳能电池性能的影响

为提高聚合物太阳能电池的能量转换效率, 将聚乙二醇(PEG)掺入PEDOT∶PSS阳极缓冲层, 研究了阳极缓冲层修饰对聚合物太阳能电池性能的影响。首先研究了聚乙二醇对PEDOT∶PSS薄膜电导率的影响, 发现PEG会与PEDOT和PSS相互作用, 使得PEDOT链重新排布, 有利于电荷载流子的传输, 从而显著改善了PEDOT∶PSS薄膜的电导率, 当PEDOT∶PSS中掺入体积分数为2%~4%的PEG时, 可得到较大的电导率。然后, 以PEG修饰的PEDOT∶PSS薄膜作为阳极缓冲层制备了聚合物太阳能电池, 研究了PEG的掺入对聚合物太阳能电池性能的影响。实验发现, PEG改善的PEDOT∶PSS电导率有利于提高电池的短路电流密度和填充因子,从而改善了器件光伏性能。当PEDOT∶PSS中掺入体积分数为2%的PEG时, 聚合物太阳能电池的能量转换效率最高, 比未掺杂的器件提高了24.4%。

Abstract

In order to improve the performance of polymer solar cells, polyethylene glycol (PEG) was incorporated into PEDOT∶PSS layer, and the effect of anode buffer layer modification on the performance of polymer solar cells was studied. First, the effect of PEG on the conductivity of PEDOT∶PSS films was studied, and the results show that PEG interacts with PEDOT and PSS, and reorients the PEDOT polymer chains, which improves the conductivity of PEDOT∶PSS layer significantly. PEDOT∶PSS layer with 2%-4%(volume fraction) PEG has the optimized conductivity. Then the bulk heterojunction polymer solar cells based on PEG modified PEDOT∶PSS anode buffer layer were prepared. It is found that PEG improves the short-circuit current density and fill factor obviously. The polymer solar cell with 2% PEG modified PEDOT∶PSS layer gives the maximum power conversion efficiency, as compared with the control device without PEG, 24.4% efficiency enhancement is achieved.

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李熊, 徐登辉, 赵佳, 耿爱丛, 邓振波. 阳极缓冲层修饰对聚合物太阳能电池性能的影响[J]. 发光学报, 2016, 37(3): 321. LI Xiong, XU Deng-hui, ZHAO Jia, GENG Ai-cong, DENG Zhen-bo. Effect of Anode Buffer Layer Modification on The Performance of Polymer Solar cells[J]. Chinese Journal of Luminescence, 2016, 37(3): 321.

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