Digitala Vetenskapliga Arkivet

Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Drastic difference between hole and electron injection through the gradient shell of CdxSeyZn1−xS1−y quantum dots
Lund Univ, Div Chem Phys, Box 124, S-22100 Lund, Sweden.;Lund Univ, NanoLund, Box 124, S-22100 Lund, Sweden.;South Valley Univ, Qena Fac Sci, Dept Chem, Qena 83523, Egypt..
Univ Copenhagen, Dept Chem, DK-2100 Copenhagen, Denmark..
Lund Univ, Div Chem Phys, Box 124, S-22100 Lund, Sweden.;Lund Univ, NanoLund, Box 124, S-22100 Lund, Sweden..
Tech Univ Denmark, Dept Chem, Kemitorvet Bldg 207, DK-2800 Lyngby, Denmark.;Dalian Univ Technol, Zhang Dayu Sch Chem, Dalian 116024, Peoples R China..
Show others and affiliations
2017 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 9, no 34, p. 12503-12508Article in journal (Refereed) Published
Abstract [en]

Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1-xS1-y gradient core-shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell thicknesses was studied. Complementary photoelectrochemical cell measurements were carried out to confirm that the hole injection from the active core through the gradient shell to NiO takes place. The hole injection from the valence band of the QDs to NiO depends much less on the shell thickness when compared to the corresponding electron injection to n-type semiconductor (ZnO). We simulate the charge carrier tunneling through the potential barrier due to the gradient shell by numerically solving the Schrodinger equation. The details of the band alignment determining the potential barrier are obtained from X-ray spectroscopy measurements. The observed drastic differences between the hole and electron injection are consistent with a model where the hole effective mass decreases, while the gradient shell thickness increases.

Place, publisher, year, edition, pages
2017. Vol. 9, no 34, p. 12503-12508
National Category
Materials Chemistry Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-335189DOI: 10.1039/c7nr04495jISI: 000409215300033PubMedID: 28819669OAI: oai:DiVA.org:uu-335189DiVA, id: diva2:1163857
Note

Title in WoS: Drastic difference between hole and electron injection through the gradient shell of CdxSeyZn1-xS1-y quantum dots

Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-28Bibliographically approved

Open Access in DiVA

fulltext(1471 kB)311 downloads
File information
File name FULLTEXT01.pdfFile size 1471 kBChecksum SHA-512
98c34137b9614151069036961cbc9e9cd5b446501c0de02f8bd5972587a790b91554fd1efea5ce33c7de14251e3aac6e5f4e3f085e4108f98283944911a25a00
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed
By organisation
Physical Chemistry
In the same journal
Nanoscale
Materials ChemistryNano Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 312 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 1922 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf