Low-boiling-point solvent additives can also enable morphological control in polymer solar cells

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• 作者：Rakesh C. Mahadevapuram ; John A. Carr ; Yuqing Chen ; Sayantan Bose ; Kanwar S. Nalwa ; Jacob W. Petrich ; Sumit Chaudhary
• 关键词：Organic solar cells ; Solvent additives ; Morphology
• 刊名：Synthetic Metals
• 出版年：1 December, 2013
• 年：2013
• 卷：185-186
• 期：Complete
• 页码：115-119
• 全文大小：1410 K

文摘

Processing organic photovoltaic (OPV) blend solutions with high-boiling-point solvent additives has recently been used for morphological control in bulk-heterojunction OPV cells. Here we show that even low-boiling-point solvents can be effective additives. When P3HT:PCBM OPV cells were processed with a low-boiling-point solvent tetrahydrafuran as an additive in parent solvent o-dichlorobenzene, charge extraction increased leading to fill factors as high as 69.5%, without low work-function cathodes, electrode buffer layers or thermal treatment. This was attributed to PCBM demixing from P3HT domains and better vertical phase separation, as indicated by photoluminescence lifetimes, hole mobilities, and shunt leakage currents. Dependence on solvent parameters and applicability beyond P3HT system was also investigated.