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Huiqiong Zhou, Yuan Zhang, Jason Seifter, Samuel D. Collins, Chan Luo, Guillermo C. Bazan, Thuc-Quyen Nguyen and Alan J. Heeger High-Efficiency Polymer Solar Cells Enhanced by Solvent Treatment Advanced Materials 25

Article first published online: 28 JAN 2013 | DOI: 10.1002/adma.201204306

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A significant enhancement of efficiency in thieno[3,4-b]-thiophene/benzodithiophene:[6,6]-phenyl C71-butyric acid methyl ester (PTB7:PC70BM) solar cells can be achieved by methanol treatment. The effects of methanol treatment are shown in an improvement of built-in voltage, a decrease in series resistance, an enhanced charge-transport property, an accelerated and enlarged charge extraction, and a reduced charge recombination, which induce a simultaneous enhancement in open-circuit voltage (Voc), short-circuit current (Jsc), and fill factor (FF) in the devices.

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