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BLASCO LADRERO Pablo.pdf (3.06 MB)

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Bachelor thesis

Publication date

2019-01

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cc-by-nc-nd (c) Blasco, 2019
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/140020

Effects of inter-nanocrystal distance on the photoluminescence and electrical properties of silicon nanocrystals

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Abstract

The effect of the variation of the distance between size-controlled silicon nanocrystals (Si NCs) on their electrical properties and low-temperature photoluminescence (PL) emission are studied in the present project. Via the superlattice approach, SiO2 barrier thicknesses from 1 nm to 3 nm, with 0.5 nm steps, alternated with layers of silicon-rich oxynitride (SRON), were deposited on a p-type Si substrate through plasma-enhanced chemical-vapor deposition. After an adequate annealing process, the precipitation of Si NCs was achieved. The low-temperature PL data were depositted using a physical model which takes into account the electron-phonon interaction between NCs, from which the average phonon energy was estimated. The obtained results demonstrate that thicker barriers (i.e., higher inter-NC distance) present lower average phonon energy, which is ascribed to a weaker NC-NC interaction and a greater carrier confinement. In addition, the I(V ) from NCs-containing device were studied. High applied electric fields resulted in Fowler-Nordheim (F-N) mechanism dominating charge transport, from which the values of the band offset energy between the electrode and the NCs-containing dielectric were figured out, being this value larger for thicker barriers, in agreement with a lower injection efficiency.

Description

Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2019, Tutors: Julià López Vidrier, Sergi Hernández Márquez

Subject

Nanocristalls, Luminescència, Propietats elèctriques, Treballs de fi de grau

Subject (English)

Nanocrystals, Luminescence, Electric properties, Bachelor's theses

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Treballs Finals de Grau (TFG) - Física

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BLASCO LADRERO, Pablo. Effects of inter-nanocrystal distance on the photoluminescence and electrical properties of silicon nanocrystals. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/140020

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