Enhancing the performance of porphyrin based solar cells by the Bipy coordination

Abstract Solution processed organic solar cells (OSCs) often suffer from low charge mobilities partially due to the disordered non-crystalline or amorphous morphology of their films. In this study, 4,4′-bipyridyl (Bipy) is introduced to coordinate a zinc(II) porphyrin to form porphyrin complexes. A significant enhanced hole mobility and solar cell device performance are attained when the ratio of Bipy is 0.25 in blend films with [6, 6]-phenyl C 61 -butyric acid methyl ester (PC 61 BM). When [6, 6]-phenyl C 71 -butyric acid methyl ester (PC 71 BM) was used instead of PC 61 BM, the PCE is enhanced to 2.83% in the presence of 0.25 equiv Bipy, which is an increase of 53% compared to that without Bipy.

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