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The effects of sterics and molecular orientation on the open‐circuit voltage and absorbance properties of charge‐transfer states are explored in model bilayer organic photovoltaics. It is shown that the open‐circuit voltage correlates linearly with the charge‐transfer state energy and is not significantly influenced by electronic coupling.
The energy of the charge‐transfer state formed between electron‐donating and electronaccepting materials, a state that directly absorbs, largely determines the limit of the open‐circuit voltage in organic photovoltaic devices. This is described in work by Aram Amassian, Michael D. McGehee and co‐workers on page 6076.
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