title: Low intensity, continuous wave photodoping of ZnO quantum dots - photon energy and particle size effects.
abstract: The unique properties of semiconductor quantum dots (QDs) have found application in the conversion of solar to chemical energy. How the relative rates of the redox processes that control QD photon efficiencies depend on the particle radius (r) and photon energy (Eλ), however, is not fully understood. Here, we address these issues and report the quantum yields (Φs) of interfacial charge transfer and electron doping in ZnO QDs capped with ethylene glycol (EG) as a function of r and Eλin the presence and absence of methyl viologen (MV2+) as an electron acceptor, respectively. We found that Φs for the oxidation of EG are independent of Eλand photon fluence (φλ), but markedly increase with r. The independence of Φs on φλensures that QDs are never populated by more than one electron-hole pair, thereby excluding Auger-type terminations. We show that these findings are consistent with the operation of an interfacial redox process that involves thermalized carriers in the Marcus inverted region. In the absence of MV2+, QDs accumulate electrons up to limiting volumetric densities ρe,∞that depend sigmoidally on excess photon energy E* = Eλ- EBG(r), where EBG(r) is the r-dependent bandgap energy. The maximum electron densities: ρev,∞∼ 4 × 1020cm-3, are reached at E* > 0.5 eV, independent of the particle radius.
authors.affiliation: Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR)-Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata-CONICET, Funes 3350, (7600) Mar del Plata, Prov. de Buenos Aires, Argentina. magrela@mdp.edu.ar.
authors.forename: Matías E
authors.initials: ME
authors.lastname: Aguirre
authors.affiliation: Departamento de Micro y Nanotecnología, GAIANN - Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499 - (1650), San Martín, Prov. de Buenos Aires, Argentina.
authors.forename: S
authors.initials: S
authors.lastname: Municoy
authors.affiliation: Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR)-Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata-CONICET, Funes 3350, (7600) Mar del Plata, Prov. de Buenos Aires, Argentina. magrela@mdp.edu.ar.
authors.forename: M A
authors.identifier: http://orcid.org/0000-0003-4487-3949
authors.initials: MA
authors.lastname: Grela
authors.affiliation: Linde Center for Global Environmental Science, California Institute of Technology, Pasadena, California 91125, USA. ajcoluss@caltech.edu.
authors.forename: A J
authors.initials: AJ
authors.lastname: Colussi