Vibronic coherence contributes to photocurrent generation in organic semiconductor heterojunction diodes

TY - JOUR

T1 - Vibronic coherence contributes to photocurrent generation in organic semiconductor heterojunction diodes

AU - Bian, Qingzhen

AU - Ma, Fei

AU - Chen, Shula

AU - Wei, Qi

AU - Su, Xiaojun

AU - Buyanova, Irina A.

AU - Chen, Weimin M.

AU - Ponseca, Carlito S.

AU - Linares, Mathieu

AU - Karki, Khadga J.

AU - Yartsev, Arkady

AU - Inganäs, Olle

N1 - Publisher Copyright: © 2020, The Author(s).

PY - 2020/12/1

Y1 - 2020/12/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85078713267&partnerID=8YFLogxK

U2 - 10.1038/s41467-020-14476-w

DO - 10.1038/s41467-020-14476-w

M3 - 文章

C2 - 32001688

AN - SCOPUS:85078713267

SN - 2041-1723

VL - 11

JO - Nature Communications

JF - Nature Communications

IS - 1

M1 - 617

ER -