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Sequential Processing: Control of Nanomorphology in Bulk Heterojunction Solar Cells
- Authors
- Wang, Dong Hwan; Moon, Ji Sun; Seifter, Jason; Jo, Jang; Park, Jong Hyeok; Park, O. Ok; Heeger, Alan J.
- Issue Date
- Aug-2011
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Organic photovoltaic device; bulk heterojuction; bilayer mixture; layer-evolved bulk heterojunction; nanoscale morphology; interdiffused structure; cosolvent effect
- Citation
- NANO LETTERS, v.11, no.8, pp 3163 - 3168
- Pages
- 6
- Journal Title
- NANO LETTERS
- Volume
- 11
- Number
- 8
- Start Page
- 3163
- End Page
- 3168
- ISSN
- 1530-6984
1530-6992
- Abstract
- Bulk heterojunction organic photovoltaic devices based on poly[N-9 ''-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT)/[6,6]-phenyl C-70 butyric acid methyl ester (PC70BM) can be successfully fabricated by a sequential solution deposition process. When the top layer is deposited from an appropriate cosolvent, the PC70BM penetrates a predeposited bottom layer of PCDTBT during the spin-casting process, resulting in an interdiffused structure with a layer-evolved bulk heterojunction (LE-BHJ) nanomorphology. The PCDTBT:PC70BM LE-BHJ solar cells prepared with an optimized cosolvent ratio have comparable power conversion efficiency to the conventional BHJ solar cells. The nanomorphology of the optimized PCDTBT:PC70BM LE-BHJ mixture was found to have better vertical connectivity than the conventional BHJ material.
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