Supersonically Spray-Coated Colloidal Quantum Dot Ink Solar Cells
[1]
- Korea Inst. of Machinery and Materials, Daejeon (Korea, Republic of). Nano-Mechanical Systems Research Division; Korea Univ. of Science and Technology (UST) Daejeon (Korea, Republic of)
- Korea Univ., Seoul (Korea, Republic of). School of Mechanical Engineering
- Korea Inst. of Machinery and Materials, Daejeon (Korea, Republic of)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
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. Here in this paper, 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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); Korea Institute for Advancement of Technology (KIAT)
- Grant/Contract Number:
- AC36-08GO28308; NRF-2016R1A2B3014182
- OSTI ID:
- 1351938
- Report Number(s):
- NREL/JA-5900-68321
- Journal Information:
- Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Organic-to-Aqueous Phase Transfer of Cadmium Chalcogenide Quantum Dots Using a Sulfur-Free Ligand for Enhanced Photoluminescence and Oxidative Stability
Secondary treatment of films of colloidal quantum dots for optoelectronics and devices produced thereby