Excitons need space to separate: Free carrier production in organic solar cells
https://techxplore.com/news/2022-08-excitons-space-free-carrier-production.html
"Marcus theory for electron transfer, combined with a consideration of the entropy associated with the charge-transfer interface and the possibility of long-range transfer events. The model shows that existing design rules for solution-phase electron transfer processes can be applied to organic photovoltaic systems... driving force calculated using the well-known Gibbs energy term... reorganization energy is identified. Third, factors that control the distance dependence of the electronic coupling are identified"
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