Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 39, Pages 16793-16800Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp106640r
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Funding
- University of North Carolina at Chapel Hill
- Office of Naval Research [N000140911016]
- NSF [DMR-0954280]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0954280] Funding Source: National Science Foundation
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Conventional wisdom dictates that the band gap and energy levels of a conjugated polymer are primarily determined by the molecular structure of the conjugated backbone, while the solubilizing alkyl chains should have a negligible impact on these properties. Hence the side chains should have minimal impact on the short circuit current (J(sc)) and open circuit voltage (V-oc) of corresponding polymer based bulk heterojunction (BHJ) solar cells. Contrary to the conventional wisdom, we demonstrate that the side chain of a low band gap polymer (PNDT-DTBT) significantly impacts the observed V-oc and J(sc) of the corresponding BHJ solar cell with variations as much as 100%, depending upon the length and shape of these alkyl chains. The observed difference in V-oc and J(sc) is quantitatively correlated with a pre-exponential dark current term, J(sc), which accounts for the intermolecular interactions in the polymer/PCBM blends.
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