Photovoltage Bleaching in Bulk Heterojunction Solar Cells through Occupation of the Charge Transfer State

Details Photovoltage Bleaching in Bulk Heterojunction Solar Cells through Occupation of the Charge Transfer State Photovoltage Bleaching in Bulk Heterojunction Solar Cells through Occupation of the Charge Transfer State

2010-04-13

arxiv.org/abs/1004.2195v1

Physics

Condensed Matter

Materials Science

submitted to Physical Review Letters

Scientific paper

We observe a strong peak in the capacitive photocurrent of a MDMO-PPV / PCBM bulk heterojunction solar cell for excitation below the absorbance threshold energy. Illumination at the peak energy blocks charge capture at other wavelengths, and causes the photovoltage to drop dramatically. These results suggest that the new peak is due to a charge transfer state, which provides a pathway for charge separation and photocurrent generation in the solar cell.

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