Hot-electron transfer in quantum-dot heterojunction films

Gianluca Grimaldi, Ryan W. Crisp, Stephanie Ten Brinck, Felipe Zapata, Michiko Van Ouwendorp, Nicolas Renaud, Nicholas Kirkwood, Wiel H. Evers, Sachin Kinge, Ivan Infante, Laurens D.A. Siebbeles, Arjan J. Houtepen

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
22 Downloads (Pure)

Abstract

Thermalization losses limit the photon-to-power conversion of solar cells at the high-energy side of the solar spectrum, as electrons quickly lose their energy relaxing to the band edge. Hot-electron transfer could reduce these losses. Here, we demonstrate fast and efficient hot-electron transfer between lead selenide and cadmium selenide quantum dots assembled in a quantum-dot heterojunction solid. In this system, the energy structure of the absorber material and of the electron extracting material can be easily tuned via a variation of quantum-dot size, allowing us to tailor the energetics of the transfer process for device applications. The efficiency of the transfer process increases with excitation energy as a result of the more favorable competition between hot-electron transfer and electron cooling. The experimental picture is supported by time-domain density functional theory calculations, showing that electron density is transferred from lead selenide to cadmium selenide quantum dots on the sub-picosecond timescale.

Original languageEnglish
Article number2310
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

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