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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