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Broadband and picosecond intraband absorption in lead-based colloidal quantum dots

Bram De Geyter (UGent) , Arjan J Houtepen, Sergio Carrillo, Pieter Geiregat (UGent) , Yunan Gao, Sybren ten Cate, Juleon M Schins, Dries Van Thourhout (UGent) , Christophe Delerue, Laurens DA Siebbeles, et al.
(2012) ACS NANO. 6(7). p.6067-6074
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Abstract
Using femtosecond transient absorption spectroscopy, we demonstrate that lead chalcogenide nanocrystals show considerable photoinduced absorption (PA) in a broad wavelength range just below the band gap. The time-dependent decay of the PA signal correlates with the recovery of the band gap absorption, indicating that the same carriers are involved. On this basis, we assign this PA signal to intraband absorption, that is, the excitation of photogenerated carriers from the bottom of the conduction band or the top of the valence band to higher energy levels in the conduction and valence band continuum. We confirm our experiments with tight-binding calculations. This broadband response in the commercially interesting near- to mid-infrared range is very relevant for ultra-high-speed all-optical signal processing. We benchmark the performance with bulk Si and Si nanocrystals.
Keywords
PBSE NANOCRYSTALS, broadband, nanocrystals, SEMICONDUCTOR NANOCRYSTALS, FREE-CARRIER ABSORPTION, SILICON NANOCRYSTALS, OPTICAL GAIN, MULTIPLICATION, SPECTROSCOPY, TRANSITIONS, EMISSION, ELECTRON, intraband absorption, lead-based quantum dots, silicon photonics, semiconductor, PbSe, PbSe/CdSe

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Citation

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MLA
De Geyter, Bram, et al. “Broadband and Picosecond Intraband Absorption in Lead-Based Colloidal Quantum Dots.” ACS NANO, vol. 6, no. 7, 2012, pp. 6067–74, doi:10.1021/nn301149x.
APA
De Geyter, B., Houtepen, A. J., Carrillo, S., Geiregat, P., Gao, Y., ten Cate, S., … Hens, Z. (2012). Broadband and picosecond intraband absorption in lead-based colloidal quantum dots. ACS NANO, 6(7), 6067–6074. https://doi.org/10.1021/nn301149x
Chicago author-date
De Geyter, Bram, Arjan J Houtepen, Sergio Carrillo, Pieter Geiregat, Yunan Gao, Sybren ten Cate, Juleon M Schins, et al. 2012. “Broadband and Picosecond Intraband Absorption in Lead-Based Colloidal Quantum Dots.” ACS NANO 6 (7): 6067–74. https://doi.org/10.1021/nn301149x.
Chicago author-date (all authors)
De Geyter, Bram, Arjan J Houtepen, Sergio Carrillo, Pieter Geiregat, Yunan Gao, Sybren ten Cate, Juleon M Schins, Dries Van Thourhout, Christophe Delerue, Laurens DA Siebbeles, and Zeger Hens. 2012. “Broadband and Picosecond Intraband Absorption in Lead-Based Colloidal Quantum Dots.” ACS NANO 6 (7): 6067–6074. doi:10.1021/nn301149x.
Vancouver
1.
De Geyter B, Houtepen AJ, Carrillo S, Geiregat P, Gao Y, ten Cate S, et al. Broadband and picosecond intraband absorption in lead-based colloidal quantum dots. ACS NANO. 2012;6(7):6067–74.
IEEE
[1]
B. De Geyter et al., “Broadband and picosecond intraband absorption in lead-based colloidal quantum dots,” ACS NANO, vol. 6, no. 7, pp. 6067–6074, 2012.
@article{3007111,
  abstract     = {{Using femtosecond transient absorption spectroscopy, we demonstrate that lead chalcogenide nanocrystals show considerable photoinduced absorption (PA) in a broad wavelength range just below the band gap. The time-dependent decay of the PA signal correlates with the recovery of the band gap absorption, indicating that the same carriers are involved. On this basis, we assign this PA signal to intraband absorption, that is, the excitation of photogenerated carriers from the bottom of the conduction band or the top of the valence band to higher energy levels in the conduction and valence band continuum. We confirm our experiments with tight-binding calculations. This broadband response in the commercially interesting near- to mid-infrared range is very relevant for ultra-high-speed all-optical signal processing. We benchmark the performance with bulk Si and Si nanocrystals.}},
  author       = {{De Geyter, Bram and Houtepen, Arjan J and Carrillo, Sergio and Geiregat, Pieter and Gao, Yunan and ten Cate, Sybren and Schins, Juleon M and Van Thourhout, Dries and Delerue, Christophe and Siebbeles, Laurens DA and Hens, Zeger}},
  issn         = {{1936-0851}},
  journal      = {{ACS NANO}},
  keywords     = {{PBSE NANOCRYSTALS,broadband,nanocrystals,SEMICONDUCTOR NANOCRYSTALS,FREE-CARRIER ABSORPTION,SILICON NANOCRYSTALS,OPTICAL GAIN,MULTIPLICATION,SPECTROSCOPY,TRANSITIONS,EMISSION,ELECTRON,intraband absorption,lead-based quantum dots,silicon photonics,semiconductor,PbSe,PbSe/CdSe}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{6067--6074}},
  title        = {{Broadband and picosecond intraband absorption in lead-based colloidal quantum dots}},
  url          = {{http://doi.org/10.1021/nn301149x}},
  volume       = {{6}},
  year         = {{2012}},
}
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