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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00481643" target="_blank" >RIV/61389021:_____/17:00481643 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/c7nr04495j" target="_blank" >http://dx.doi.org/10.1039/c7nr04495j</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c7nr04495j" target="_blank" >10.1039/c7nr04495j</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nanoscale

ISSN

2040-3364

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

34

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

12503-12508

UT code for WoS article

000409215300033

EID of the result in the Scopus database

2-s2.0-85028699658