CuInS 2 quantum dots coated with cds as high-performance sensitizers for TiO 2 electrodes in hydrogen production and photovoltaic applications

T. L. Li, H. Teng

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

Abstract

We demonstrate a high-performance photoanode composed of a nanoporous TiO 2 film co-sensitized with CuInS 2 quantum dots (QDs) and CdS polycrystalline layers, exhibiting the excellent performance in both photosynthetic and photovoltaic applications. The CuInS 2 QDs are synthesized via a solvothermal route and the average particle size is 3.5 nm, attached on TiO 2 surface by assistance of bifunctional linker. The subsequent CdS layers are coated using successive ionic layer adsorption and reaction. The back reaction of interfacial charge recombination can be prohibited by the CdS coating. Besides, the CdS shell coating results in remission of the quantum confinement of the QDs, leading to a widening of optical absorption spectra. In a photosynthetic photoelectrochemical cell, this heterostructural electrode exhibits a saturated photocurrent of 16 mA cm -2 under illumination of AM 1.5G at full sun intensity. On the other hand, this high-performance photoanode exhibits a power conversion efficiency of 4.08% in a sandwich-type quantum dot sensitized solar cells (QDSSCs) using CuS as counter electrode. The superior performance is mainly ascribed to the extension of the absorption spectra and significant enhancement of charge separation via CdS coating.

Original languageEnglish
Title of host publicationPhotovoltaics for the 21st Century 7
Pages221-231
Number of pages11
Edition4
DOIs
Publication statusPublished - 2011 Dec 1
EventPhotovoltaics for the 21st Century 7 - 220th ECS Meeting - Boston, MA, United States
Duration: 2011 Oct 92011 Oct 14

Publication series

NameECS Transactions
Number4
Volume41
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherPhotovoltaics for the 21st Century 7 - 220th ECS Meeting
CountryUnited States
CityBoston, MA
Period11-10-0911-10-14

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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