Open AccessModel To Determine a Distinct Rate Constant for Carrier Multiplication from Experiments
Author(s) -
Frank C. M. Spoor,
Gianluca Grimaldi,
Sachin Kinge,
Arjan J. Houtepen,
Laurens D. A. Siebbeles
Publication year - 2018
Publication title -
acs applied energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.833
H-Index - 36
ISSN - 2574-0962
DOI - 10.1021/acsaem.8b01779
Subject(s) - charge carrier , relaxation (psychology) , constant (computer programming) , photon , time constant , multiplication (music) , photon energy , electron , absorption (acoustics) , semiconductor , yield (engineering) , materials science , computational physics , physics , atomic physics , condensed matter physics , optoelectronics , optics , quantum mechanics , thermodynamics , computer science , electrical engineering , psychology , social psychology , acoustics , programming language , engineering
Carrier multiplication (CM) is the process in which multiple electron-hole pairs are created upon absorption of a single photon in a semiconductor. CM by an initially hot charge carrier occurs in competition with cooling by phonon emission, with the respective rates determining the CM efficiency. Up until now, CM rates have only been calculated theoretically. We show for the first time how to extract a distinct CM rate constant from experimental data of the relaxation time of hot charge carriers and the yield of CM. We illustrate this method for PbSe quantum dots. Additionally, we provide a simplified method using an estimated energy loss rate to estimate the CM rate constant just above the onset of CM, when detailed experimental data of the relaxation time is missing.
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