Phonons Do Not Assist Carrier Multiplication in PbSe Quantum Dot Solids
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† Optoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
‡ Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
*E-mail: [email protected]
Abstract
Carrier multiplication (CM)—the Coulomb scattering whereby a sufficiently energetic charge excites a valence electron—is of interest for highly efficient quantum dot (QD) photovoltaics. Using time-resolved microwave conductivity experiments on 1,2-ethanedithiol-linked PbSe QD solids infilled with Al2O3 or Al2O3/ZnO by atomic layer deposition, we find that CM and hot-carrier cooling are temperature independent from 90–295 K and that spontaneous phonon emission limits the yield of charges resulting from the CM–cooling competition.
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