Efficient, stable infrared photovoltaics based on solution-cast colloidal quantum dots

Ghada I. Koleilat, Larissa Levina, Harnik Shukla, Stefan H. Myrskog, Sean Hinds, Andras G. Pattantyus-Abraham, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

424 Scopus citations

Abstract

Half of the sun's power lies in the infrared. As a result, the optimal bandgaps for solar cells in both the single-junction and even the tandem architectures lie beyond 850 nm. However, progress in low-cost, large-area, physically flexible solar cells has instead been made in organic and polymer materials possessing absorption onsets in the visible. Recent advances have been achieved in solution-cast infrared photovoltaics through the use of colloidal quantum dots. Here we report stable solution-processed photovoltaic devices having 3.6% power conversion efficiency in the infrared. The use of a strongly bound bidentate linker, benzenedithiol, ensures device stability over weeks. The devices reach external quantum efficiencies of 46% in the infrared and 70% across the visible. We investigate in detail the physical mechanisms underlying the operation of this class of device. In contrast with drift-dominated behavior in recent reports of PbS quantum dot photovoltaics, we find that diffusion of electrons and holes over hundreds of nanometers through our PbSe colloidal quantum dot solid is chiefly responsible for the high external quantum efficiencies obtained in this new class of devices.

Original languageEnglish (US)
Pages (from-to)833-840
Number of pages8
JournalACS nano
Volume2
Issue number5
DOIs
StatePublished - May 2008

Keywords

  • Benzenedithiol linker
  • Carrier transport
  • Infrared photovoltaics
  • PbSe nanocrystals
  • Rectifying junction

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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