Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation

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

doi:10.1021/jz502253r

Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation

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

Research output: Contribution to journal › Article › peer-review

49 Scopus citations

Abstract

© 2014 American Chemical Society. 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.

Original language	English (US)
Pages (from-to)	6-12
Number of pages	7
Journal	The Journal of Physical Chemistry Letters
Volume	6
Issue number	1
DOIs	https://doi.org/10.1021/jz502253r
State	Published - Dec 15 2014
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1-015-21
Acknowledgements: This work was partially supported by the Center for Advanced
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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title = "Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation",

abstract = "{\textcopyright} 2014 American Chemical Society. 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.",

author = "Ayzner, {Alexander L.} and Dennis Nordlund and Do-Hwan Kim and Zhenan Bao and Toney, {Michael F.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-C1-015-21 Acknowledgements: This work was partially supported by the Center for Advanced This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2014",

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doi = "10.1021/jz502253r",

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T1 - Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation

AU - Ayzner, Alexander L.

AU - Nordlund, Dennis

AU - Kim, Do-Hwan

AU - Bao, Zhenan

AU - Toney, Michael F.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUS-C1-015-21 Acknowledgements: This work was partially supported by the Center for Advanced This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2014/12/15

Y1 - 2014/12/15

N2 - © 2014 American Chemical Society. 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.

AB - © 2014 American Chemical Society. 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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JO - The Journal of Physical Chemistry Letters

JF - The Journal of Physical Chemistry Letters

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Ultrafast Electron Transfer at Organic Semiconductor Interfaces: Importance of Molecular Orientation

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