Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 5, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4742143
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Funding
- National Science Foundation (NSF) [CBET-0746210, ECCS-0801924]
- NSF through REU site [EEC-0851987]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0746210] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0801924] Funding Source: National Science Foundation
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With the aim of extending the photoresponse of the poly(3-hexylthiophene)/[6,6]-phenyl-C61-butyric acid methyl ester photovoltaic system into the near-infrared region, a low band gap polymer poly [2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2, 6-diyl]] was incorporated to make ternary blend solar cells. Solvent additive 1,8-diiodooctane (DIO) was applied to optimize the phase separation in a one-step active layer preparation. Devices fabricated with DIO additive demonstrate an improvement of device power conversion efficiency by 17%, which can be attributed to favorable microscopic structure of the ternary blend with 1:1:0.2 composition processed with DIO and extended absorption on the red side of the visible spectrum up to 900 nm. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4742143]
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