Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
In order to overcome the efficiency limits of conventional solar cells new device concepts have to be developed. Hot-electron solar cells aim at efficiently extracting high-energy carriers before thermalization occurs, thus increasing the device photovoltage. Semiconductor quantum dots (QDs) have been long considered an ideal system for the exploitation of hot-electron transfer (HET), due to the slowed cooling resulting from their discrete density of states.
In recent years, HET has been reported to occur from QDs to metal oxide nanoparticles1-2 and to defect localized on the surface of core-shell nanocrystals3. We combined individually synthetized CdSe and PbSe quantum dots in a layer-by-layer film coupled by short conductive ligands. We report a Transient Absorption study demonstrating the presence of HET between different NCs materials in a conductive QD-solid. The HET efficiency increases with the kinetic energy of the excited electron, demonstrating that the transfer proceeds via unthermalized electrons. The bi-component QD-films allow tuning of the energy levels of the individual QD-materials, allowing further optimization of the energy alignment to enhance HET efficiency.
Tisdale, W. A.; Williams, K. J.; Timp, B. A.; Norris, D. J.; Aydil, E. S.; Zhu, X. Y., Hot-Electron Transfer from Semiconductor Nanocrystals. Science 2010, 328 (5985), 1543-7.
Williams, K. J.; Nelson, C. A.; Yan, X.; Li, L. S.; Zhu, X. Y., Hot Electron Injection from Graphene Quantum Dots to TiO Acs Nano 2013, 7 (2), 1388-1394.
Pandey, A.; Guyot-Sionnest, P., Hot Electron Extraction From Colloidal Quantum Dots. Journal of Physical Chemistry Letters 2010, 1 (1), 45-47.
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