TY - JOUR
T1 - Experimental and theoretical investigation of electronic structure in colloidal indium phosphide quantum dots
AU - Ellingson, Randy J.
AU - Blackburn, Jeffrey L.
AU - Nedeljkovic, Jovan
AU - Rumbles, Garry
AU - Jones, Marcus
AU - Fu, H.
AU - Nozik, Arthur J.
PY - 2003/12/1
Y1 - 2003/12/1
N2 - We present detailed electronic structure calculations, based on an atomistic pseudopotential approach, for a 42 Å InP QD; theoretical results are correlated to results of experimental measurements. To better understand energy loss dynamics and mechanisms for hot carriers in QDs, we investigate relaxation between electronic levels in InP QDs with diameters significantly smaller than twice the Bohr exciton radius. Energy level spacings exceeding the optical phonon energy present the opportunity for slowed charge carrier cooling (phonon bottleneck effect). However, interaction between confined electrons and holes provides an alternate, efficient relaxation route. Therefore, we expect sufficiently fast charge separation to weaken the Coulomb interaction and decrease the electronic energy loss rate. We study electronic relaxation in InP QDs using variations of subpicosecond transient absorption spectroscopy.
AB - We present detailed electronic structure calculations, based on an atomistic pseudopotential approach, for a 42 Å InP QD; theoretical results are correlated to results of experimental measurements. To better understand energy loss dynamics and mechanisms for hot carriers in QDs, we investigate relaxation between electronic levels in InP QDs with diameters significantly smaller than twice the Bohr exciton radius. Energy level spacings exceeding the optical phonon energy present the opportunity for slowed charge carrier cooling (phonon bottleneck effect). However, interaction between confined electrons and holes provides an alternate, efficient relaxation route. Therefore, we expect sufficiently fast charge separation to weaken the Coulomb interaction and decrease the electronic energy loss rate. We study electronic relaxation in InP QDs using variations of subpicosecond transient absorption spectroscopy.
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U2 - 10.1002/pssc.200303100
DO - 10.1002/pssc.200303100
M3 - Conference article
AN - SCOPUS:34247259306
SP - 1229
EP - 1232
JO - Physica Status Solidi C: Conferences
JF - Physica Status Solidi C: Conferences
SN - 1862-6351
IS - 4
T2 - 2nd International Conference on Semiconductor Quantum Dots, QD 2002
Y2 - 30 September 2002 through 3 October 2002
ER -