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- W2311437225 abstract "Although organic heterojunctions can separate charges with near-unity efficiency and on a sub-picosecond timescale, the full details of the charge-separation process remain unclear. In typical models, the Coulomb binding between the electron and the hole can exceed the thermal energy $k_mathrm{B}T$ by an order of magnitude, suggesting that it is impossible for the charges to separate before recombining. Here, we consider the entropic contribution to charge separation in the presence of disorder and find that even modest amounts of disorder have a decisive effect, reducing the charge-separation barrier to about $k_mathrm{B}T$ or eliminating it altogether. Therefore, the charges are usually not thermodynamically bound at all and could separate spontaneously if the kinetics otherwise allowed it. Our conclusion holds despite the worst-case assumption of localised, thermalised carriers, and is only strengthened if mechanisms like delocalisation or `hot' states are also present." @default.
- W2311437225 created "2016-06-24" @default.
- W2311437225 creator A5046143495 @default.
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- W2311437225 date "2016-10-28" @default.
- W2311437225 modified "2023-10-17" @default.
- W2311437225 title "Entropy and Disorder Enable Charge Separation in Organic Solar Cells" @default.
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- W2311437225 doi "https://doi.org/10.1021/acs.jpclett.6b02178" @default.
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