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Chih-Wei Wang†, Hong Rae Kim†, Jared Hampton, Doyun Kim, Qing Tu, Jae-Chul Pyun, and Dong Hee Son* († equally contributed)
Effects of Hole Transporting PEDOT:PSS on the Photoemission of Upconverted Hot Electron in Mn-doped CdS/ZnS Quantum Dots
J. Chem. Phys., 159, 054703
Date: Aug 2, 2023

In this work, we investigated the effect of hole transporting poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) interfacing with Mn-doped CdS/ZnS quantum dots (QDs) deposited on an indium tin oxide (ITO) substrate on the photoemission of upconverted hot electrons under weak continuous wave photoexcitation in a vacuum. Among the various factors that can influence the photoemission of the upconverted hot electrons, we studied the role of PEDOT:PSS in facilitating the hole transfer from QDs and altering the energy of photoemitted hot electrons. Compared to hot electrons emitted from QDs deposited directly on the ITO substrate, the addition of the PEDOT:PSS layer between the QD and ITO layers increased the energy of the photoemitted hot electrons. The increased energy of the photoemitted hot electrons is attributed in part to the reduced steady-state positive charge on the QDs under continuous photoexcitation, which reduces the energy required to eject the electron from the conduction band.

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