Solar cells using quantum funnels

Illan J. Kramer, Larissa Levina, Ratan Debnath, David Zhitomirsky, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

Colloidal quantum dots offer broad tuning of semiconductor bandstructure via the quantum size effect. Devices involving a sequence of layers comprised of quantum dots selected to have different diameters, and therefore bandgaps, offer the possibility of funneling energy toward an acceptor. Here we report a quantum funnel that efficiently conveys photoelectrons from their point of generation toward an intended electron acceptor. Using this concept we build a solar cell that benefits from enhanced fill factor as a result of this quantum funnel. This concept addresses limitations on transport in soft condensed matter systems and leverages their advantages in large-area optoelectronic devices and systems.

Original languageEnglish (US)
Pages (from-to)3701-3706
Number of pages6
JournalNano letters
Volume11
Issue number9
DOIs
StatePublished - Sep 14 2011

Keywords

  • bandgap engineering
  • colloidal quantum dot
  • Depleted heterojunction
  • photovoltaics
  • quantum funnel
  • solar cell

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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