Vibronic coherence contributes to photocurrent generation in organic semiconductor heterojunction diodes.

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 photocurrent generation. This coherent process breaks th

SUBMITTER: Bian Q 

PROVIDER: S-EPMC6992633 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature