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Nanoscale mapping of photo-induced charge carriers generated at interfaces of a donor/acceptor 2D-assembly by light-assisted- scanning tunneling microscopy

Abstract : We have investigated charge transfers between donor (D) and acceptor (A) species at their excited state in a light-assisted STM setup (LA-STM). Through an all-solution process, we have elaborated supramolecular architectures deposited on the Au(111) surface and made of 2D islands of PC71BM (electron acceptor) on top of a single layer of the polymer PTB7 (electron donor). The STM junction under modulated laser irradiation exhibits a strong background of photothermal signal attributed both to vertical and lateral expansion of the tip. However, from the analysis of di↵erential images obtained at opposite voltages, we have been able to detect additional photocurrent peaks located at the PTB7/PC71BM interfaces, providing evidence for active charge transfer between D/A species at their excited state. We discuss this phenomenon in the framework of a charge transport model at interfaces in organic electronics systems.
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Submitted on : Monday, November 9, 2020 - 3:34:08 PM
Last modification on : Wednesday, November 25, 2020 - 3:35:46 AM
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Andrés Lombana, Nicolas Battaglini, Samia Zrig, Jerome Lagoute, Alexandre Chevillot-Biraud, et al.. Nanoscale mapping of photo-induced charge carriers generated at interfaces of a donor/acceptor 2D-assembly by light-assisted- scanning tunneling microscopy. Advanced Materials Interfaces, Wiley, In press, ⟨10.1002/admi.202001325⟩. ⟨hal-02996285⟩

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