Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells: Article No. 622

Matthew Beard, Hyekyoung Choi, Jong-Gun Lee, Xuan Mai, Sam Yoon, Sohee Jeong

Research output: Contribution to journalArticlepeer-review

54 Scopus Citations

Abstract

Controlling the thickness of quantum dot (QD) films is difficult using existing film formation techniques, which employ pre-ligand-exchanged PbS QD inks, because of several issues: 1) poor colloidal stability, 2) use of high-boiling-point solvents for QD dispersion, and 3) limitations associated with one-step deposition. Herein, we suggest a new protocol for QD film deposition using electrical double-layered PbS QD inks, prepared by solution-phase ligand exchange using methyl ammonium lead iodide (MAPbI3). The films are deposited by the supersonic spraying technique, which facilitates the rapid evaporation of the solvent and the subsequent deposition of the PbS QD ink without requiring a post-deposition annealing treatment for solvent removal. The film thickness could be readily controlled by varying the number of spraying sweeps made across the substrate. This spray deposition process yields high-quality n-type QD films quickly (within 1 min) while minimizing the amount of the PbS QD ink used to less than 5 mg for one device (300-nm-thick absorbing layer, 2.5 x 2.5 cm2). Further, the formation of an additional p-layer by treatment with mercaptopropionic acid allows for facile hole extraction from the QD films, resulting in a power conversion efficiency of 3.7% under 1.5 AM illumination.
Original languageAmerican English
Number of pages8
JournalScientific Reports
Volume7
DOIs
StatePublished - 2017

NREL Publication Number

  • NREL/JA-5900-68321

Keywords

  • deposition
  • quantum dots
  • solar cells

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