Mechanism for dimethylformamide-treatment of poly(3,4-ethylenedioxythiophene) : poly(styrene sulfonate) layer to enhance short circuit current of polymer solar cells
Song, Qun Liang
Li, Chang Ming
Date of Issue2012
School of Chemical and Biomedical Engineering
Centre for Advanced Bionanosystems
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.
Solar energy materials and solar cells
© 2012 Elsevier B.V.