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    Unity quantum yield of photogenerated charges and band-like transport in quantum-dot solids

    Year: 2011

    Journal: Nature Nanotechnology, 2011, 6, 733–739, 20131009

    Authors: Elise Talgorn, Yunan Gao, Michiel Aerts, Lucas T. Kunneman, Juleon M. Schins, T. J. Savenije, Marijn A. Van Huis, Herre S. J. Van der Zant, Arjan J. Houtepen, Laurens D. A. Siebbeles

    Organizations: Optoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands; Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands; EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium

    Solid films of colloidal quantum dots show promise in the manufacture of photodetectors and solar cells. These devices require high yields of photogenerated charges and high carrier mobilities, which are difficult to achieve in quantum-dot films owing to a strong electron–hole interaction and quantum confinement. Here, we show that the quantum yield of photogenerated charges in strongly coupled PbSe quantum-dot films is unity over a large temperature range. At high photoexcitation density, a transition takes place from hopping between localized states to band-like transport. These strongly coupled quantum-dot films have electrical properties that approach those of crystalline bulk semiconductors, while retaining the size tunability and cheap processing properties of colloidal quantum dots.