Mechanism for dimethylformamide-treatment of poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) layer to enhance short circuit current of polymer solar cells

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• 作者：Cheng Gong^a ; ^b ; Hong Bin Yang^a ; ^b ; Qun Liang Song^a ; ^b ; Zhi Song Lu^a ; ^b ; Chang Ming Li^a ; ^b ; ^{ecmli@ntu.edu.sg}
• 关键词：Polymer solar cell ; DMF ; Organic solvent ; PEDOT ; PSS ; P3HT ; PCBM
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2012
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：May, 2012
• 卷：100
• 期：Complete
• 页码：115-119
• 文件大小：628 K

摘要

Dimethylformamide (DMF), an organic solvent, was used to treat the poly(3, 4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) layer in poly(3-hexylthiophene) (P3HT): [6,6]-phenyl C61-butyric acid methyl ester (PCBM) polymer solar cells, resulting in significant enhancement of photocurrent and power conversion efficiency (PCE) improvement by 70%. Analyses of I-V characteristics reveal that the change in the active layer rather than that of the PEDOT: PSS buffer layer is ascribed to performance improvement. AFM images indicate that the roughness of PEDOT: PSS layer has been increased after the treatment. We argue that the protrudent PEDOT: PSS could serve as the centers for an initial crystallization of P3HT chains leading to a better alignment of P3HT: PCBM domains for a greatly enhanced photocurrent.