Journal
NANO LETTERS
Volume 13, Issue 3, Pages 994-999Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3041417
Keywords
PbS; CdS; quantum dot; chemical bath deposition; heterojunction; solar cell
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Funding
- U.S. Army through Institute for Soldier Nanotechnologies [W911NF-07-D-0004]
- Chesonis Fellowship Fund
- Fannie and John Hertz Foundation
- National Science Foundation
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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 degrees 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.
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