Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 112, Issue 11, Pages 4350-4354Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp075565x
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Funding
- National Research Foundation of Korea [2007-00275] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Using ultrafast spectroscopy, we have investigated the generation of mobile carriers in bulk heterojunction (BHJ) blends of regioregular poly(3-hexylthiophene), rrP3HT and the [6,6]-phenyl-C-61 butyric acid methyl ester fullerene derivative, PCBM. Mobile carriers are generated via a two-step process: initial ultrafast charge separation to an intermediate charge transfer (CT) bound state, followed by the transfer of carriers onto the bicontinuous networks. The yield of mobile carriers is decreased by recombination during the time spent in the CT bound state. After annealing the BHJ blends, the recombination loss of mobile carriers is reduced by a factor of 2.5, consistent with the observed increase in photovoltaic conversion efficiency.
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