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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..
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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
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Materials Chemistry Nano Technology
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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

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