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Effect of temperature on carrier formation efficiency in organic photovoltaic cells
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The internal quantum efficiency ( ) of an organic photovoltaic cell is governed by plural processes. Here, we propose that can be experimentally decomposed into carrier formation ( ) and carrier transfer ( ) efficiencies. By combining femtosecond time-resolved and electrochemical spectroscopy, we clarified the effect of temperature on in a regioregular poly(3-hexylthiophene) (rr-P3HT)/[6,6]-phenyl C61-butyric acid methyl ester blend film. We found that at 80 K is the same as that (=0.55) at 300 K. The temperature insensitivity of indicates that the electron-hole pairs at the D/A interface are seldom subjected to coulombic binding energy.
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