Carrier multiplication in semiconductor nanocrystals: theoretical screening of candidate materials based on band-structure effects

Nano Letters
Jun-Wei LuoAlex Zunger

Abstract

Direct carrier multiplication (DCM) occurs when a highly excited electron-hole pair decays by transferring its excess energy to the electrons rather than to the lattice, possibly exciting additional electron-hole pairs. Atomistic electronic structure calculations have shown that DCM can be induced by electron-hole Coulomb interactions, in an impact-ionization-like process whose rate is proportional to the density of biexciton states rho XX. Here we introduce a DCM "figure of merit" R2(E) which is proportional to the ratio between the biexciton density of states rhoXX and the single-exciton density of states rhoX, restricted to single-exciton and biexciton states that are coupled by Coulomb interactions. Using R2(E), we consider GaAs, InAs, InP, GaSb, InSb, CdSe, Ge, Si, and PbSe nanocrystals of different sizes. Although DCM can be affected by both quantum-confinement effects (reflecting the underly electronic structure of the confined dot-interior states) and surface effects, here we are interested to isolate the former. To this end the nanocrystal energy levels are obtained from the corresponding bulk band structure via the truncated crystal approximation. We find that PbSe, Si, GaAs, CdSe, and InP nanocrystals have larger DCM...Continue Reading

References

Jun 15, 1995·Physical Review. B, Condensed Matter·L W Wang, A Zunger
Oct 15, 1996·Physical Review. B, Condensed Matter·G Kresse, J Furthmüller
Jul 15, 1990·Physical Review. B, Condensed Matter·J GeistF J Wilkinson
Oct 15, 1993·Physical Review. B, Condensed Matter·S B ZhangA Zunger
May 12, 2005·Nano Letters·Randy J EllingsonAlexander L Efros
Oct 22, 2005·Science·Ilan GurA Paul Alivisatos
Mar 9, 2006·Journal of the American Chemical Society·James E MurphyArthur J Nozik
Oct 13, 2006·Nano Letters·A FranceschettiA Zunger
Dec 14, 2006·Nano Letters·A ShabaevA J Nozik
Jul 25, 2007·Nano Letters·Matthew C BeardArthur J Nozik
May 21, 2008·Nano Letters·M Tuan TrinhLaurens D A Siebbeles

❮ Previous
Next ❯

Citations

Mar 28, 2013·Accounts of Chemical Research·Lazaro A PadilhaVictor I Klimov
Mar 6, 2013·Accounts of Chemical Research·Heather M JaegerOleg V Prezhdo
Oct 16, 2009·Accounts of Chemical Research·Andrew M Smith, Shuming Nie
Sep 8, 2010·The Journal of Chemical Physics·Andrei Piryatinski, Kirill A Velizhanin
Apr 3, 2012·The Journal of Chemical Physics·Jennifer M ElwardArindam Chakraborty
Mar 1, 2012·The Journal of Chemical Physics·Heather M JaegerOleg V Prezhdo
Sep 6, 2012·Artificial Cells, Nanomedicine, and Biotechnology·M A JalilP P Yupapin
Nov 18, 2014·Optics Express·A J NeukirchO V Prezhdo
Dec 11, 2014·Physical Chemistry Chemical Physics : PCCP·Andrew Sills, Marco Califano
Oct 30, 2009·Physical Chemistry Chemical Physics : PCCP·Marco Califano
Jun 17, 2014·Physical Chemistry Chemical Physics : PCCP·Stephen V KershawAndrey L Rogach
Nov 12, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Kim Hyeon-DeukOleg V Prezhdo
Aug 22, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Kim Hyeon-Deuk, Oleg V Prezhdo
Oct 12, 2018·Nature Communications·Chris de WeerdTom Gregorkiewicz
Jan 25, 2013·Physical Review Letters·S WippermannG Galli
Sep 30, 2009·Nano Letters·Adam GaliGiulia Galli
Jul 13, 2021·Nanoscale·Ivan Marri, Stefano Ossicini
Jun 17, 2010·Nano Letters·Byungmoon ChoDavid M Jonas
Aug 2, 2017·Nano Letters·Carl Jackson StolleBrian A Korgel

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.