Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201703355
Keywords
charge generation; charge recombination; extraction; mobility; organic solar cells; polymer:fullerene bulk heterojunction
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Organic semiconductors are of great interest for a broad range of optoelectronic applications due to their solution processability, chemical tunability, highly scalable fabrication, and mechanical flexibility. In contrast to traditional inorganic semiconductors, organic semiconductors are intrinsically disordered systems and therefore exhibit much lower charge carrier mobilities-the Achilles heel of organic photovoltaic cells. In this progress review, the authors discuss recent important developments on the impact of charge carrier mobility on the charge transfer state dissociation, and the interplay of free charge extraction and recombination. By comparing the mobilities on different timescales obtained by different techniques, the authors highlight the dispersive nature of these materials and how this reflects on the key processes defining the efficiency of organic photovoltaics.
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