TY - JOUR
T1 - Multiexciton generation in IV-VI nanocrystals
T2 - The role of carrier effective mass, band mixing, and phonon emission
AU - Zohar, Gal
AU - Baer, Roi
AU - Rabani, Eran
PY - 2013/1/17
Y1 - 2013/1/17
N2 - We study the role of the effective mass, band mixing, and phonon emission on multiexciton generation in IV-VI nanocrystals. A four-band k · p effective mass model, which allows for an independent variation of these parameters, is adopted to describe the electronic structure of the nanocrystals. Multiexciton generation efficiencies are calculated using a Green's function formalism, providing results that are numerically similar to impact excitation. We find that multiexciton generation efficiencies are maximized when the effective mass of the electron and hole are small and similar. Contact with recent experimental results for multiexciton generation in PbS and PbSe is made.
AB - We study the role of the effective mass, band mixing, and phonon emission on multiexciton generation in IV-VI nanocrystals. A four-band k · p effective mass model, which allows for an independent variation of these parameters, is adopted to describe the electronic structure of the nanocrystals. Multiexciton generation efficiencies are calculated using a Green's function formalism, providing results that are numerically similar to impact excitation. We find that multiexciton generation efficiencies are maximized when the effective mass of the electron and hole are small and similar. Contact with recent experimental results for multiexciton generation in PbS and PbSe is made.
KW - Physical Processes in Nanomaterials and Nanostructures
UR - http://www.scopus.com/inward/record.url?scp=84872732027&partnerID=8YFLogxK
U2 - 10.1021/jz301892z
DO - 10.1021/jz301892z
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AN - SCOPUS:84872732027
SN - 1948-7185
VL - 4
SP - 317
EP - 322
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 2
ER -