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    Free Charges Produced by Carrier Multiplication in Strongly Coupled PbSe Quantum Dot Films

    Year: 2011

    Journal: Nano Lett., 2011, 11 (10), 4485–4489, 20131009

    Authors: Michiel Aerts, C. S. Suchand Sandeep, Yunan Gao, Tom J. Savenije, Juleon M. Schins, Arjan J. Houtepen, Sachin Kinge, Laurens D. A. Siebbeles

    Organizations: Optoeletronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands; The Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands; Toyota Europe, Materials Research & Development, Hoge Wei 33, B-1930 Zaventem, Belgium

    We show that in films of strongly coupled PbSe quantum dots multiple electron–hole pairs can be efficiently produced by absorption of a single photon (carrier multiplication). Moreover, in these films carrier multiplication leads to the generation of free, highly mobile charge carriers rather than excitons. Using the time-resolved microwave conductivity technique, we observed the production of more than three electron–hole pairs upon absorption of a single highly energetic photon (5.7Eg). Free charge carriers produced via carrier multiplication are readily available for use in optoelectronic devices even without employing any complex donor/acceptor architecture or electric fields.