Journal
ORGANIC ELECTRONICS
Volume 12, Issue 9, Pages 1465-1470Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2011.05.020
Keywords
Bulk heterojunction; Photovoltaic; Hansen solubility parameter; Mesitylene; Acetophenone
Funding
- Army Research Laboratory through the Flexible Display Center at ASU [W911NF-04-2-0005]
- Advanced Photovoltaics Center
- National Science Foundation [CBET-0756148]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0748867] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0756148] Funding Source: National Science Foundation
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High efficiency bulk heterojunction (BHJ) organic solar cells based upon poly(3-hexylthiophene) (P3HT)-[6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) are typically solution processed using halogenated solvents like dichlorobenzene (DCB). In this report, we tune the quality of solvent systems using more environmentally friendly, halogen-free solvents to mimic that of DCB based on Hansen solubility parameters (HSPs). A mixture of acetophenone (AP) and mesitylene (MS) can nearly match the HSPs for DCB. Solar cells fabricated using this solvent mixture can exhibit power conversion efficiency (PCE) comparable to that from DCB with a similar surface morphology. It is critical to control the drying process in the mixed solvent system due to significant volatility difference between AP and MS in order to achieve comparable morphology and PCE. This report illustrates a route to fabricate high efficiency BHJ solar cells from halogen-free solvent systems that could eliminate potential hurdles for manufacturing scale-up of organic BHJ solar cells. (C) 2011 Elsevier B.V. All rights reserved.
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