Journal
ADVANCED MATERIALS
Volume 25, Issue 11, Pages 1646-1652Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201204306
Keywords
polymer solar cells; bulk heterojunctions; solvent treatment; impedance analysis; transient photoconductivity
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Funding
- Department of Energy Office of Basic Energy Sciences [DE-FG02-08ER46535]
- Camille Dreyfus Teacher Scholar Award
- Alfred Sloan Research Fellowship program
- NSF [DMR-1121053]
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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 (V-oc), short-circuit current (J(sc)), and fill factor (FF) in the devices.
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