All solid state multiply layered PbS colloidal quantum-dot-sensitized photovoltaic cells

Sang Hyuk Im, Hi Jung Kim, Sung Woo Kim, Sang Wook Kim, Sang Ii Seok

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

The combination of solution processable colloidal quantum dots (CQDs) and organic conjugated polymers has attracted growing interest in the past few years, because devices fabricated using this combination can have potentially low cost and high efficiency. In this paper, we propose a new device architecture of multiply layered PbS CQD-sensitized photovoltaic cells. The multiple layers of PbS CQDs were formed by the repeated spin-coating of oleic-acid-capped PbS CQD solution and 1 wt% 1,2-ethanedithiol (EDT) solution onto mesoporous (mp)-TiO 2 as photoanode. Through the structural advantage of a sensitized type device and post-treatment in 10 wt% EDT solution for 16 h, we could fabricate efficient photovoltaic cells having an overall energy conversion efficiency of 2.9% under 1 sun illumination, and an external quantum efficiency of over 15% at zero bias with a signal attenuation to frequency of 10 kHz levels in the near-infrared (NIR) range.

Original languageEnglish
Pages (from-to)4181-4186
Number of pages6
JournalEnergy and Environmental Science
Volume4
Issue number10
DOIs
Publication statusPublished - 2011 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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