Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.97: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Electroluminescence from silicon nanoparticles — •Jens Theis1, Martin Geller1, Axel Lorke1, Hartmut Wiggers2, and Cedrik Meier3 — 1Fakultät für Physik and CeNIDE, Universität Duisburg-Essen — 2Institut für Verbrennung und Gasdynamik and CeNIDE, Universität Duisburg-Essen — 3Nanophotonics & Nanomaterials Group, University Paderborn
Si nanoparticles are tuneable light emitters and therefore a promising material for optoelectronic applications. We have fabricated an electroluminescence device based on silicon nanoparticles on a micropatterned semiconductor heterostructure. The Si nanoparticles have been synthesized from the gas phase in a low-pressure microwave plasma using SiH4 as a precursor. The nanoparticles were dispersed from an aqueous solution onto the patterned substrate. For carrier injection, the particle layer was sandwiched between a transparent ITO layer and a Si-doped GaAs back contact. A strong EL emission from the Si nanoparticles is observed with the unaided eye[1]. The EL spectra of the devices were investigated in a µ-photoluminescence setup, confirming that the EL in the visible range is indeed caused by the Si nanoparticles. Additionally, we study the influence of the waveform, frequency and amplitude of the driving AC voltage on the electroluminescence.
[1] Theis et al. Nanotechnology 21, 455201 (2009)