Morphological device model for organic bulk heterojunction solar cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 19719114.
- Also identified by DOI 10.1021/nl901511a.
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Abstract
We present a numerical model for calculating current-voltage characteristics of polymer:fullerene bulk hetrojunction solar cells at different degrees of nanoscale phase separation. We show that the short-circuit current enhancement with finer phase separation is due to a reduction in bimolecular recombination caused by lateral movement of photogenerated electrons to the fullerene-rich phase. At high bias, vertical electron transport is enhanced and lateral movement is reduced, causing a significant field-dependent carrier extraction for coarse morphologies.