High efficient inverted polymer solar cells with different annealing treatment

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• 作者：Xiaowei Xu^a ; Fujun Zhang^a ; ^{fjzhang@bjtu.edu.cn} ; Jian Zhang^b ; ^{Jianzhang@dicp.ac.cn} ; Hui Wang^c ; Zuliang Zhuo^a ; Yang Liu^a ; Jian Wang^a ; Zixuan Wang^a ; Zheng Xu^a
• 关键词：Inverted polymer solar cells ; Annealing treatment ; P3HT ; PCBM ; Buffer layers
• 刊名：Materials Science and Engineering ; C
• 出版年：2012
• 期刊代码：63_09284931
• 类别：ms
• 出版时间：1 May, 2012
• 卷：32
• 期：4
• 页码：685-691
• 文件大小：1553 K

摘要

Inverted polymer solar cells (IPSCs) were fabricated with cesium carbonate (Cs₂CO₃) modified indium tin oxide (ITO) substrates as the electrode and molybdenum trioxide (MoO₃) modified Al as the anode. The Cs₂CO₃ dissolved in 2-ethoxyethanol was spin-coated on ITO substrates, showing snowflake-like morphology characterized by the scanning electron microscope (SEM). The absorption, X-ray diffraction as well as the morphology of the active layer were measured before and after annealing treatment. The IPSCs with annealing treatments on the active layers and MoO₃ layers exhibited the maximum power conversion efficiency (PCE) approaching to 2%, with open circuit voltage (V_oc) of 0.57 V, short circuit current density (J_sc) of 8.8 mA/cm² and fill factor (FF) of 38.7%. The performance of IPSCs was dramatically decreased by annealing treatment after the deposition of Al cathode, which may be due to the diffusion of Al atom crossing the MoO₃ layer forming new channels for charge carrier collection. However, the new channels are not beneficial to the charge carrier collection, which is demonstrated from that the J_sc of IPSCs was evidently decreased from 8.8 to 4.6 mA/cm² by annealing treatment after deposition Al layer. The annealing treatment after deposition of MoO₃ could improve the interfacial contact to aid in electron extraction.