The use of multi-size arrays of colloidal quantum dots to study energy and electron transport in QD junctions

Emily A. Weiss, Scott M. Geyer, Venda J. Porter, Ryan C. Chiechi, Moungi G. Bawendi, George M. Whitesides

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

Abstract

This paper describes the electrical characteristics of junctions composed of three-dimensional arrays of colloidal CdSe quantum dots (QDs) with tin-doped indium oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and eutectic Ga-In (EGaIn) electrodes. It focuses on a comparison of junctions containing QDs of one size to those of arrays containing QDs of multiple sizes. This comparison makes it possible to estimate the relative contributions of transport across various interfaces (e.g., between the QDs and between the QDs and the electrodes) to the observed electrical characteristics of the junction and to evaluate the dependence of these contributions on the locations of various sizes of QDs within the junction. The junctions were diodes, and their turn-on voltage depended on the size of the QDs next to the PEDOT:PSS. We describe this dependence using a Marcus model to estimate the barrier for charge transfer induced by the difference in energies between the orbitale of the QDs and the valence band of PEDOT:PSS.

Original languageEnglish
Title of host publicationNext-Generation and Nano-Architectured Photovoltaics
Pages1-10
Number of pages10
Publication statusPublished - Dec 1 2009
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 30 2009Dec 4 2009

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1121
ISSN (Print)0272-9172

Other

Other2009 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/30/0912/4/09

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Weiss, E. A., Geyer, S. M., Porter, V. J., Chiechi, R. C., Bawendi, M. G., & Whitesides, G. M. (2009). The use of multi-size arrays of colloidal quantum dots to study energy and electron transport in QD junctions. In Next-Generation and Nano-Architectured Photovoltaics (pp. 1-10). (Materials Research Society Symposium Proceedings; Vol. 1121).