Influence of PC₆₀BM or PC₇₀BM as electron acceptor on the performance of polymer solar cells

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• 作者：Fujun Zhang^a ; ^{fjzhang@bjtu.edu.cn} ; Zuliang Zhuo^a ; Jian Zhang^b ; ^{jianzhang@dicp.ac.an} ; Xin Wang^a ; Xiaowei Xu^a ; Zixuan Wang^a ; Yusheng Xin^a ; Jian Wang^a ; Jin Wang^a ; Weihua Tang^c ; ^{whtang@mail.njust.edu.cn} ; Zheng Xu^a ; Yongsheng Wang^a
• 关键词：P3HT ; PC70BM ; PC60BM ; Photon harvesting ; Power conversion efficiency
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 出版时间：February, 2012
• 年：2012
• 卷：97
• 期：Complete
• 页码：71-77
• 全文大小：1661 K

文摘

Two series of P3HT-based polymer solar cell (PSCs) only with different electron acceptors PC₇₀BM or PC₆₀BM were investigated under the same conditions. The PSCs with PC₇₀BM as the electron acceptor exhibit a relatively strong and broad absorption in the visible range and high external quantum efficiency, which results in a relatively high open circuit voltage (V_oc) of 0.62 V, short circuit current density (J_sc) of 11.85 mA/cm² and power conversion efficiency (PCE) of 3.52 % . The PSCs with PC₆₀BM as the electron acceptor have a relatively low V_oc of 0.58 V, J_sc of 10.68 mA/cm² and PCE of 3.02 % due to the weak absorption of PC₆₀BM in the visible light range. The function of PC₇₀BM instead of PC₆₀BM as electron acceptor could be summarized as follows: i) the strong absorption PC₇₀BM in the visible range results in much more photon harvesting; ii) the relatively low electron mobility and relatively big size of PC₇₀BM molecule influences the charge transporting and phase separation. The ultimate performances of PSCs are codetermined by the photon harvesting, exciton dissociation, charge carrier transport and collection.