Journal
NANO LETTERS
Volume 11, Issue 8, Pages 3163-3168Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202320r
Keywords
Organic photovoltaic device; bulk heterojuction; bilayer mixture; layer-evolved bulk heterojunction; nanoscale morphology; interdiffused structure; cosolvent effect
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Funding
- ERC [R11-2007-045-01002-0(2009)]
- Korea Ministry of Education, Science and Technology (MEST) [2011-0006268]
- MEST [R32-2008-000-10142-0, NRF-2009-C1AAA001-2009-0094157, 2010-0029321]
- Department of Energy [BES-DOE- ER46535]
- National Research Foundation of Korea [2010-0029321, 과C6A1907] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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