Abstract
Nanometer-sized particles of indium antimonide (InSb) offer opportunities in areas such as solar energy conversion and single photon sources. Here, we measure electron-hole pair dynamics, spectra, and absorption cross sections of strongly quantum-confined colloidal InSb nanocrystal quantum dots using femtosecond transient absorption. For all samples, we observe a bleach feature that develops on ultrafast time scales, which notably moves to lower energy during the first several picoseconds following excitation. We associate this unusual red shift, which becomes larger for larger particles and more distinct at lower sample temperatures, with hot exciton cooling through states that we suggest arise from energetically proximal conduction band levels. From controlled optical excitation intensities, we determine biexciton lifetimes, which range from 2 to 20 ps for the studied 3-6 nm diameter particle sizes.
| Original language | English |
|---|---|
| Pages (from-to) | 8513-8519 |
| Number of pages | 7 |
| Journal | ACS Nano |
| Volume | 8 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2014 |
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Keywords
- Auger recombination
- indium antimonide
- InSb
- intraband relaxation
- nanocrystal quantum dots
- semiconductor nanocrystals
- transient absorption
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)
Cite this
Carrier dynamics in highly quantum-confined, colloidal indium antimonide nanocrystals. / Chang, Angela Y.; Liu, Wenyong; Talapin, Dmitri V.; Schaller, Richard D.
In: ACS Nano, Vol. 8, No. 8, 2014, p. 8513-8519.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Carrier dynamics in highly quantum-confined, colloidal indium antimonide nanocrystals
AU - Chang, Angela Y.
AU - Liu, Wenyong
AU - Talapin, Dmitri V.
AU - Schaller, Richard D
PY - 2014
Y1 - 2014
N2 - Nanometer-sized particles of indium antimonide (InSb) offer opportunities in areas such as solar energy conversion and single photon sources. Here, we measure electron-hole pair dynamics, spectra, and absorption cross sections of strongly quantum-confined colloidal InSb nanocrystal quantum dots using femtosecond transient absorption. For all samples, we observe a bleach feature that develops on ultrafast time scales, which notably moves to lower energy during the first several picoseconds following excitation. We associate this unusual red shift, which becomes larger for larger particles and more distinct at lower sample temperatures, with hot exciton cooling through states that we suggest arise from energetically proximal conduction band levels. From controlled optical excitation intensities, we determine biexciton lifetimes, which range from 2 to 20 ps for the studied 3-6 nm diameter particle sizes.
AB - Nanometer-sized particles of indium antimonide (InSb) offer opportunities in areas such as solar energy conversion and single photon sources. Here, we measure electron-hole pair dynamics, spectra, and absorption cross sections of strongly quantum-confined colloidal InSb nanocrystal quantum dots using femtosecond transient absorption. For all samples, we observe a bleach feature that develops on ultrafast time scales, which notably moves to lower energy during the first several picoseconds following excitation. We associate this unusual red shift, which becomes larger for larger particles and more distinct at lower sample temperatures, with hot exciton cooling through states that we suggest arise from energetically proximal conduction band levels. From controlled optical excitation intensities, we determine biexciton lifetimes, which range from 2 to 20 ps for the studied 3-6 nm diameter particle sizes.
KW - Auger recombination
KW - indium antimonide
KW - InSb
KW - intraband relaxation
KW - nanocrystal quantum dots
KW - semiconductor nanocrystals
KW - transient absorption
UR - http://www.scopus.com/inward/record.url?scp=84906712041&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84906712041&partnerID=8YFLogxK
U2 - 10.1021/nn5031274
DO - 10.1021/nn5031274
M3 - Article
VL - 8
SP - 8513
EP - 8519
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 8
ER -