Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells

Hyekyoung Choi, Jong Gun Lee, Xuan Dung Mai, Matthew C. Beard, Suk Goo Yoon, Sohee Jeong

Research output: Contribution to journalArticle

14 Citations (Scopus)

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 × 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 languageEnglish
Article number622
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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Ink
Semiconductor quantum dots
Solar cells
Spraying
Ligands
Boiling point
Iodides
Ammonium Compounds
Conversion efficiency
Film thickness
Ion exchange
Evaporation
Lighting
Annealing
Acids
Substrates

ASJC Scopus subject areas

  • General

Cite this

Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells. / Choi, Hyekyoung; Lee, Jong Gun; Mai, Xuan Dung; Beard, Matthew C.; Yoon, Suk Goo; Jeong, Sohee.

In: Scientific Reports, Vol. 7, No. 1, 622, 01.12.2017.

Research output: Contribution to journalArticle

Choi, Hyekyoung ; Lee, Jong Gun ; Mai, Xuan Dung ; Beard, Matthew C. ; Yoon, Suk Goo ; Jeong, Sohee. / Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells. In: Scientific Reports. 2017 ; Vol. 7, No. 1.
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