Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 10, Pages 1707-1717Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz4002339
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Funding
- Leona M. and Harry B. Helmsley Charitable Trust
- Wolfson Family Trust
- Nancy and Stephen Grand Center for Sensors Security
- Snyder Family Foundation
- Israel Ministry of Science
- Weizmann Inst.
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Charge separation at organic-organic (O-O) interfaces is crucial to how many organic-based optoelectronic devices function. However, the mechanism of formation of spatially separated charge carriers and the role of geminate recombination remain topics of discussion and research. We review critically the contributions of the various factors, including electric fields, long-range order, and excess energy (beyond the minimum needed for photoexcitation), to the probability that photogenerated charge carriers will be separated. Understanding the processes occurring at the O/O interface and their relative importance for effective charge separation is crucial to design efficient solar cells and photodetectors. We stress that electron and hole delocalization after photoinduced charge transfer at the interface is important for efficient free carrier generation. Fewer defects at the interface and long-range order in the materials also improve overall current efficiency in solar cells. In efficient organic cells, external electric fields play only a small role for charge separation.
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