Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)
HL 95.7: Poster
Thursday, March 19, 2015, 14:00–20:00, Poster B
Cadmium Selenide / Cadmium Sulfide Core-Shell Quantum Dots in Titanium Dioxide — •Beate Horn1, Svenja Herbertz1, Thomas Heinzel1, and Klaus Schierbaum2 — 1Solid State Physics Laboratory, Heinrich-Heine-Universität Düsseldorf — 2Material Science Laboratory, Heinrich-Heine-Universität Düsseldorf
Cadmium selenide (CdSe) quantum dots (QD) were synthesised following procedure described by[2]. The growth of the CdS-shell is done in another chemical reaction adapting the procedure from[1]. A red shift of about 20nm in the emission and absorption spectra and the enlargement of quantum yield from 6.7% to 51.2% prove shell formation around the QD-core. The CdSe/CdS QD's were redissolved in chloroform and inserted into porous titanium dioxide[4] using mercaptopropionic acid. Frontface-fluorescence spectroscopy indicated adsorption of CdSe/CdS QD's into the titanium dioxide . A lower fluorescence signal after annihilation of the CdSe/CdS titanium dioxide samples indicates direct contact between the titanium dioxide and the CdSe/CdS QDs. Photo current measurements further prove the adsorption of the CdSe/CdS QDs'. Finally the influence of the CdSe/CdS QDs' on hydrogen sensing is investigated (and compared to [3]), using a platinum-titanium dioxide Schottky barrier with inserted CdSe/CdS QDs. Moreover the effect of electroformation was investigated. [1] Yue Y., Chem. Res. Ch. Un. 2010, 26(6), 871-875 [2] Murray C., Norris D., J. Am. Chem. Soc. 1993, 115, 8706-8715 [3] Cerchez, M. Langer, H. El Achhab, M. Heinzel, T., Appl. Phys. 103, 033522 (2013) [4] Achhab E., Erbe A., 2014, Appl. Phys. A (2014) 116:20392044