Silicon nanocrystal surface engineering and their electronic interaction with carbon based materials

V. Švrček, D. Mariotti, S. Cook, S. Kazaoui, Y. Shibata, M. Kondo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hybrid nanomaterials that consist of silicon nanocrystals (Si-ncs) and carbon-based nanostructures (i.e. nanotubes, fullerenes C 60, etc.) may represent a new class of materials for photovoltaics (PV) with potential for improvements in efficiency and ease of device integration. In this contribution we present results on photovoltaic applications of surfactant-free, quantum confined and surface-engineered Si-ncs combined with semiconducting single walled carbon nanotubes (SWCNTs) or C 60. We show that both types of carbon-based nanomaterials allow for electronic interactions with the Si-ncs. Firstly, the electronic interactions between Si-ncs and purified semiconducting SWCNTs has shown opto-electronic conversion over a large spectral range (300-1600 nm). but, in order to enhance interface interactions, the accurate control of Si-ncs surface properties is essential. Secondly, our approach to achieve effective Si-ncs surface engineering is based on nanosecond pulsed laser processing in liquid media. We provide evidence that laser processing in water induces Si-ncs dipole-dipole surface interactions that result in self-organized Si-ncs patterns. The subsequent deposition of a C 60 nano-layer on the Si-ncs forms a bulk-type heterojunction. Solar cell devices made out of these surface-engineered Si-ncs and the C 60 nano-layer showed photovoltaic action with increased conversion efficiency due to Si-ncs surface engineering.

Original languageEnglish
Title of host publicationProgram - 37th IEEE Photovoltaic Specialists Conference, PVSC 2011
Pages281-285
Number of pages5
DOIs
Publication statusPublished - 2011 Dec 1
Externally publishedYes
Event37th IEEE Photovoltaic Specialists Conference, PVSC 2011 - Seattle, WA, United States
Duration: 2011 Jun 192011 Jun 24

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Other

Other37th IEEE Photovoltaic Specialists Conference, PVSC 2011
CountryUnited States
CitySeattle, WA
Period11/6/1911/6/24

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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