Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 6, Issue 1, Pages 6-12Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz502253r
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Funding
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- Global Climate and Energy Program at Stanford
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Science, ICT and Future Planning, Korea [2011-0031628]
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Much is known about the rate of photoexcited charge generation in at organic donor/acceptor (D/A) heterojunctions overaged over all relative arrangements. However, there has been very little experimental work investigating how the photoexcited electron transfer (ET) rate depends on the precise relative molecular orientation between D and A in thin solid films. This is the question that we address in this work. We find that the ET rate depends strongly on the relative molecular arrangement: The interface where the model donor compound copper phthalocyanine is oriented face-on with respect to the fullerene C-60 acceptor yields a rate that is approximately 4 times faster than that of the edge-on oriented interface. Our results suggest that the D/A electronic coupling is significantly enhanced in the face-on case, which agrees well with theoretical predictions, underscoring the importance of controlling the relative interfacial molecular orientation.
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