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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...
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