Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Charge transport in organic semiconductors, while absoultly fundamental to the orperation of all opto-electronic devices, is not yet fully understood. Through transient experiments, it has been shown that charge transport is indeed dispersive, with the mobility of carriers decaying as charges relax within a density of states, however, the importance of this process on steady state behavior has not yet been realized. In this work, we take a detailed look at charge transport in the common high-performance organic solar cell system PCDTBT:PCBM. We develop a new architecture for selectively exciting holes/electrons in the blend for transient experiments, by introducing a perovskite charge generation layer. By tuning the electrodes/interlayers, the transient mobility of holes and/or electrons can be measured within the bulk heterojunction blend absent of recombination. These transient studies are also directly compared with steady state techniques. The result is a more complete view of charge transort and its role in optoelectronic device operation.
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