Choosing the right nanoparticle size-designing novel ZnO electrode architectures for efficient dye-sensitized solar cells

Markus W. Pfau, Andreas Kunzmann, Doris Segets, Wolfgang Peukert, Gordon G. Wallace, David L. Officer, Tim Clark, Rubén D. Costa, Dirk M. Guldi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A novel concept for constructing optimized ZnO-based photoanodes as integrative components of dye-sensitized solar cells (DSSCs) is realized by deploying differently sized nanoparticles, ranging from 2 to 10 nm, together with commercially available 20 nm nanoparticles. The 2 nm nanoparticles were used to construct an efficient buffer layer for transparent electrodes based on 10 nm nanoparticles, resulting in a relative increase of device efficiency from 1.8 to 3.0% for devices without and with a buffer layer, respectively. A mixture of 10 and 20 nm nanoparticles was optimized to maximize the diffuse reflection and to minimize the charge transport resistance in a light-scattering layer. This optimization resulted in a homogenous layer of more than 15 μm that provided a device efficiency of 3.3%. The buffer layer, transparent electrode, and light-scattering electrode, were then combined to give an overall efficiency of around 5%. Thus, this work demonstrates that varying the electrode architecture with nanoparticles of different diameters is a powerful strategy for improving the overall efficiency of ZnO-based DSSCs.

Original languageEnglish
Pages (from-to)7516-7522
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number16
DOIs
Publication statusPublished - 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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