Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions

Liang Yi Chang, Richard R. Lunt, Patrick R. Brown, Vladimir Bulović, Moungi G. Bawendi

Research output: Contribution to journalArticle

  • 90 Citations

Abstract

PbS colloidal quantum dot heterojunction solar cells have shown significant improvements in performance, mostly based on devices that use high-temperature annealed transition metal oxides to create rectifying junctions with quantum dot thin films. Here, we demonstrate a solar cell based on the heterojunction formed between PbS colloidal quantum dot layers and CdS thin films that are deposited via a solution process at 80 C. The resultant device, employing a 1,2-ethanedithiol ligand exchange scheme, exhibits an average power conversion efficiency of 3.5%. Through a combination of thickness-dependent current density-voltage characteristics, optical modeling, and capacitance measurements, the combined diffusion length and depletion width in the PbS quantum dot layer is found to be approximately 170 nm.

LanguageEnglish (US)
Pages994-999
Number of pages6
JournalNano Letters
Volume13
Issue number3
DOIs
StatePublished - Mar 13 2013

Profile

Semiconductor quantum dots
Heterojunctions
heterojunctions
Solar cells
solar cells
quantum dots
Thin films
Temperature
Capacitance measurement
thin films
diffusion length
Oxides
Conversion efficiency
Transition metals
metal oxides
depletion
Current density
capacitance
transition metals
Ligands

Keywords

  • CdS
  • chemical bath deposition
  • heterojunction
  • PbS
  • quantum dot
  • solar cell

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions. / Chang, Liang Yi; Lunt, Richard R.; Brown, Patrick R.; Bulović, Vladimir; Bawendi, Moungi G.

In: Nano Letters, Vol. 13, No. 3, 13.03.2013, p. 994-999.

Research output: Contribution to journalArticle

Chang LY, Lunt RR, Brown PR, Bulović V, Bawendi MG. Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions. Nano Letters. 2013 Mar 13;13(3):994-999. Available from, DOI: 10.1021/nl3041417
Chang, Liang Yi ; Lunt, Richard R. ; Brown, Patrick R. ; Bulović, Vladimir ; Bawendi, Moungi G./ Low-temperature solution-processed solar cells based on PbS colloidal quantum dot/CdS heterojunctions. In: Nano Letters. 2013 ; Vol. 13, No. 3. pp. 994-999
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