English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Cation exchange synthesis and optoelectronic properties of type II CdTe-Cu2-xTe nano-heterostructures

Kriegel, I., Wisnet, A., Kandada, A. R. S., Scotognella, F., Tassone, F., Scheu, C., et al. (2014). Cation exchange synthesis and optoelectronic properties of type II CdTe-Cu2-xTe nano-heterostructures. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, 2(17), 3189-3198. doi:10.1039/c3tc32049a.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B88D-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6E5A-0
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Kriegel, Ilka1, 2, 3, Author              
Wisnet, Andreas2, 4, Author              
Kandada, Ajay Ram Srimath5, Author              
Scotognella, Francesco1, Author              
Tassone, Francesco5, Author              
Scheu, Christina2, 6, Author              
Zhang, Hui7, Author              
Govorov, Alexander O.7, Author              
Rodriguez-Fernandez, Jessica2, 3, Author              
Feldmann, Jochen2, 3, Author              
Affiliations:
1Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy, ou_persistent22              
2Nanosystems Initiative Munich (NIM), Munich, Germany, ou_persistent22              
3Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München, Munich, Germany, ou_persistent22              
4Department of Chemistry, Ludwig-Maximilians-Universität and Center for NanoScience (CeNS), Butenandtstraße 11, 81377 Munich, Germany, ou_persistent22              
5CNST of IITatPOLIMI, Via Pascoli 70/3, 20133 Milano, Italy, ou_persistent22              
6Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians Universität München, Germany, ou_persistent22              
7Department of Physics and Astronomy, Ohio University, Athens OH 45701, USA, ou_persistent22              

Content

show
hide
Free keywords: CDSE QUANTUM DOTS; SURFACE-PLASMON RESONANCES; ANISOTROPIC SEMICONDUCTOR NANOCRYSTALS; PHOTOINDUCED CHARGE SEPARATION; DISCRETE-DIPOLE APPROXIMATION; OCTAPOD SHAPED NANOCRYSTALS; CORE/SHELL NANOCRYSTALS; OPTICAL-PROPERTIES; SELECTIVE GROWTH; EPITAXIAL-GROWTHMaterials Science; Physics;
 Abstract: Rod-shaped CdTe-Cu2-xTe nano-heterostructures with tunable dimensions of both sub-units and a type II band alignment were prepared by Cd2+/Cu+ cation exchange. The light absorption properties of the heterostructures are dominated by the excitonic and plasmonic contributions arising, respectively, from the CdTe and the Cu2-xTe sub-units. These results were confirmed over a wide range of sub-unit length fractions through optical modelling based on the discrete dipole approximation (DDA). Although assuming electronically independent sub-units, our modelling results indicate a negligible ground state interaction between the CdTe exciton and the Cu2-xTe plasmon. This lack of interaction may be due to the low spectral overlap between exciton and plasmon, but also to localization effects in the vacancy-doped sub-unit. The electronic interaction between both sub-units was evaluated with pump-probe spectroscopy by assessing the relaxation dynamics of the excitonic transition. In particular, the CdTe exciton decays faster in the presence of the Cu2-xTe sub-unit, and the decay gets faster with increasing its length. This points towards an increased probability of Auger mediated recombination due to the high carrier density in the Cu2-xTe sub-unit. This indication is supported through length-fraction dependent band structure calculations, which indicate a significant leakage of the CdTe electron wavefunction into the Cu2-xTe sub-unit that increases along with the shortening of the CdTe sub-unit, thus enhancing the probability of Auger recombination. Therefore, for the application of type II chalcogenide-chalcogenide heterostructures based on Cu and Cd for photoenergy conversion, a shorter Cu-based sub-unit may be advantageous, and the suppression of high carrier density within this sub-unit is of high importance.

Details

show
hide
Language(s): eng - English
 Dates: 2014-05-07
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000334124800013
DOI: 10.1039/c3tc32049a
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Abbreviation : J. Mater. Chem. C
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 2 (17) Sequence Number: - Start / End Page: 3189 - 3198 Identifier: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526