Optimized phase separation in low-bandgap polymer:fullerene bulk heterojunction solar cells with criteria of solvent additives
- Type
- Article
- Citation
- Nano Energy, v.30, pp.200 - 207
- Issued Date
- 2016-12
- Abstract
- We investigate a correlation between the type of solvent additives (SAs) with specific criteria such as aromatic additives (AAs) and non-aromatic additives (NAAs) and phase separation in the bulk heterojunction (BHJ) films comprising low-band gap polymer and fullerene derivatives. When AAs are used as SAs, the geometrical structures (π-π and lamellar stacking) of aggregated polymer chains do not significantly change. However, NAAs increase the lamellar stacking distance through a strong interaction with non-aromatic segments of polymers. Therefore, a well-phase separated BHJ morphology with the finer fibrils is developed, thereby leading to balanced charge mobilities and a reduced charge recombination in BHJ solar cells. Finally, the optimized solar cell exhibits a high power conversion efficiency of 7.9%. © 2016 Elsevier Ltd
- Publisher
- ELSEVIER SCIENCE BV
- ISSN
- 2211-2855
- Appears in Collections:
- Department of Chemistry > 1. Journal Articles
Department of Materials Science and Engineering > 1. Journal Articles
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