Ultrafast charge transfer in operating bulk heterojunction solar cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 25677734.
- Also identified by DOI 10.1002/adma.201405284.
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Abstract
The ultrafast charge generation process in organic solar cell devices is investigated by transient reflection spectroscopy on five state-of-the-art bulk heterojunction systems. The charge generation process in operating devices is found to be a combination of an ultrafast generation mechanism over several hundred femto-seconds and a slow process from pico-seconds to nanoseconds, limited by exciton diffusion dynamics. In addition, the lack of electric field dependence in the charge dynamics rules out geminate recombination as an important loss mechanism.