Ultrafast electron transfer at organic semiconductor interfaces: Importance of molecular orientation

Ayzner, Alexander L.; Nordlund, Dennis; Kim, Do -Hwan; Bao, Zhenan; Toney, Michael F.

doi:10.1021/jz502253r

Title: Ultrafast electron transfer at organic semiconductor interfaces: Importance of molecular orientation

Journal Article · Thu Dec 04 00:00:00 EST 2014 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/jz502253r· OSTI ID:1215420

Ayzner, Alexander L. ^[1]; Nordlund, Dennis ^[2]; Kim, Do -Hwan ^[3]; Bao, Zhenan ^[4]; Toney, Michael F. ^[2]

Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Laboratory, Menlo Park, CA (United States)
SLAC National Accelerator Laboratory, Menlo Park, CA (United States)
Soongsil Univ., Seoul (Korea)
Stanford Univ., Stanford, CA (United States)

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 C₆₀ 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: 2011-0031628; KUS-C1-015-21

OSTI ID:: 1215420

Journal Information:: Journal of Physical Chemistry Letters, Vol. 6, Issue 1; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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