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Molecular control of quantum-dot internal electric field and its application to CdSe-based solar cells.
Yaacobi-Gross, Nir; Soreni-Harari, Michal; Zimin, Marina; Kababya, Shifi; Schmidt, Asher; Tessler, Nir.
Afiliação
  • Yaacobi-Gross N; Zisapel Nano-electronics Centre, Department of Electrical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.
Nat Mater ; 10(12): 974-9, 2011 Oct 09.
Artigo em Inglês | MEDLINE | ID: mdl-21983889
ABSTRACT
Inorganic nanocrystals are attractive materials for solar-cell applications. However, the performance of such devices is often limited by an insufficient alignment of energy levels in the nanocrystals. Here, we report that by attaching two different molecules to a single quantum dot or nanocrystal one can induce electric fields large enough to significantly alter the electronic and optoelectronic properties of the quantum dot. This electric field is created within the nanocrystals owing to a mixture of amine- and thiol-anchor-group ligands. Examining the steady state as well as temporal evolution of the optical properties and the nuclear magnetic resonances of the nanocrystals we found that the first excitonic peak shifts as a function of the capping-layer composition. We also demonstrate that the use of a mixed-ligand-induced electric field markedly enhances the charge generation efficiency in layer-by-layer CdSe-nanocrystal-based solar cells, thus improving the overall cell efficiency.

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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Nat Mater Assunto da revista: Ciência / Química Ano de publicação: 2011 Tipo de documento: Artigo País de afiliação: Israel