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Vibronic coherence contributes to photocurrent generation in organic semiconductor heterojunction diodes

Bian, Qingzhen ; Ma, Fei LU ; Chen, Shula ; Wei, Qi ; Su, Xiaojun LU ; Buyanova, Irina A. ; Chen, Weimin M. ; Ponseca, Carlito S. LU ; Linares, Mathieu and Karki, Khadga J. LU , et al. (2020) In Nature Communications 11.
Abstract

Charge separation dynamics after the absorption of a photon is a fundamental process relevant both for photosynthetic reaction centers and artificial solar conversion devices. It has been proposed that quantum coherence plays a role in the formation of charge carriers in organic photovoltaics, but experimental proofs have been lacking. Here we report experimental evidence of coherence in the charge separation process in organic donor/acceptor heterojunctions, in the form of low frequency oscillatory signature in the kinetics of the transient absorption and nonlinear two-dimensional photocurrent spectroscopy. The coherence plays a decisive role in the initial ~200 femtoseconds as we observe distinct experimental signatures of coherent... (More)

Charge separation dynamics after the absorption of a photon is a fundamental process relevant both for photosynthetic reaction centers and artificial solar conversion devices. It has been proposed that quantum coherence plays a role in the formation of charge carriers in organic photovoltaics, but experimental proofs have been lacking. Here we report experimental evidence of coherence in the charge separation process in organic donor/acceptor heterojunctions, in the form of low frequency oscillatory signature in the kinetics of the transient absorption and nonlinear two-dimensional photocurrent spectroscopy. The coherence plays a decisive role in the initial ~200 femtoseconds as we observe distinct experimental signatures of coherent photocurrent generation. This coherent process breaks the energy barrier limitation for charge formation, thus competing with excitation energy transfer. The physics may inspire the design of new photovoltaic materials with high device performance, which explore the quantum effects in the next-generation optoelectronic applications.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
11
article number
617
publisher
Nature Publishing Group
external identifiers
  • scopus:85078713267
  • pmid:32001688
ISSN
2041-1723
DOI
10.1038/s41467-020-14476-w
language
English
LU publication?
yes
id
7bdab61c-42ed-4ebd-8033-6d94daa564dd
date added to LUP
2020-02-11 09:38:12
date last changed
2021-06-13 06:20:18
@article{7bdab61c-42ed-4ebd-8033-6d94daa564dd,
  abstract     = {<p>Charge separation dynamics after the absorption of a photon is a fundamental process relevant both for photosynthetic reaction centers and artificial solar conversion devices. It has been proposed that quantum coherence plays a role in the formation of charge carriers in organic photovoltaics, but experimental proofs have been lacking. Here we report experimental evidence of coherence in the charge separation process in organic donor/acceptor heterojunctions, in the form of low frequency oscillatory signature in the kinetics of the transient absorption and nonlinear two-dimensional photocurrent spectroscopy. The coherence plays a decisive role in the initial ~200 femtoseconds as we observe distinct experimental signatures of coherent photocurrent generation. This coherent process breaks the energy barrier limitation for charge formation, thus competing with excitation energy transfer. The physics may inspire the design of new photovoltaic materials with high device performance, which explore the quantum effects in the next-generation optoelectronic applications.</p>},
  author       = {Bian, Qingzhen and Ma, Fei and Chen, Shula and Wei, Qi and Su, Xiaojun and Buyanova, Irina A. and Chen, Weimin M. and Ponseca, Carlito S. and Linares, Mathieu and Karki, Khadga J. and Yartsev, Arkady and Inganäs, Olle},
  issn         = {2041-1723},
  language     = {eng},
  month        = {01},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Vibronic coherence contributes to photocurrent generation in organic semiconductor heterojunction diodes},
  url          = {http://dx.doi.org/10.1038/s41467-020-14476-w},
  doi          = {10.1038/s41467-020-14476-w},
  volume       = {11},
  year         = {2020},
}