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Proceedings Paper

Charge transfer effects in graphene-CdSe/ZnS quantum dots composites
Author(s): Alexander V. Klekachev; Inge Asselberghs; Sergey N. Kuznetsov; Mirco Cantoro; Jeong Hun Mun; Byung-Jin Cho; Jun-ichi Hotta; Johan Hofkens; Marleen van der Veen; André L. Stesmans; Marc M. Heyns; Stefan De Gendt
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Paper Abstract

Graphene possesses unique physical properties, due to its specific energy bands configuration, substantially different from that of materials traditionally employed in solid-state optoelectronics. Among the variety of remarkable properties, strong field effect, high transparency in the visible-light range and low resistivity of graphene sheets are the most attractive ones for optoelectronic applications. Zero-dimensional colloidal semiconductor nanocrystals, known as quantum dots (QDs), attract immense attention in the field of photonics due to their size-dependent tunable optical properties. By combining these two types of nanomaterials together, we demonstrate the role of graphene as an efficient charge transfer medium from- and to II-VI quantum dots. The optical excitation of II-VI quantum dots dispersed on single layer graphene results in an electron transfer from the nanocrystals to graphene. This is evidenced from photoluminescence imaging and confirmed by the electrical measurements on QDs-decorated single layer graphene field effect transistors (SLG-FET). In the second part of this paper we demonstrate an efficient hole injection from graphene into QDs-layered nanocrystalline structures and the operation of the corresponding graphene-based quantum dot light emitting diodes (QD-LED). We also benchmark graphene vs. indium-tin-oxide (ITO) based QD-LEDs in terms of device electroluminescence intensity performance. Our experimental results show better hole injection efficiency for graphenebased electrode at current densities as high as 200 mA/cm2 and suggest single layer graphene as a strong candidate to replace ITO in QD-LED technology.

Paper Details

Date Published: 27 September 2012
PDF: 11 pages
Proc. SPIE 8462, Carbon Nanotubes, Graphene, and Associated Devices V, 84620L (27 September 2012); doi: 10.1117/12.930082
Show Author Affiliations
Alexander V. Klekachev, IMEC (Belgium)
Katholieke Univ. Leuven (Belgium)
Inge Asselberghs, IMEC (Belgium)
Katholieke Univ. Leuven (Belgium)
Sergey N. Kuznetsov, Petrozavodsk State Univ. (Russian Federation)
Mirco Cantoro, IMEC (Belgium)
Katholieke Univ. Leuven (Belgium)
Jeong Hun Mun, KAIST (Korea, Republic of)
Byung-Jin Cho, KAIST (Korea, Republic of)
Jun-ichi Hotta, Katholieke Univ. Leuven (Belgium)
Johan Hofkens, Katholieke Univ. Leuven (Belgium)
Marleen van der Veen, IMEC (Belgium)
André L. Stesmans, Katholieke Univ. Leuven (Belgium)
Marc M. Heyns, IMEC (Belgium)
Katholieke Univ. Leuven (Belgium)
Stefan De Gendt, IMEC (Belgium)
Katholieke Univ. Leuven (Belgium)

Published in SPIE Proceedings Vol. 8462:
Carbon Nanotubes, Graphene, and Associated Devices V
Didier Pribat; Young-Hee Lee; Manijeh Razeghi, Editor(s)

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