Tuning Solute-Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum-Dot Optoelectronics.
Shaheen, Basamat S.
Kim, Yong Ho
Mohammed, Omar F.
Sargent, Edward H
Kim, Jin Young
Jung, Yeon Sik
KAUST DepartmentChemical Science Program
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Embargo End Date2020-06-01
Permanent link to this recordhttp://hdl.handle.net/10754/656356
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AbstractSolution-processed colloidal quantum dots (CQDs) are attractive materials for the realization of low-cost and efficient optoelectronic devices. Although impressive CQD-solar-cell performance has been achieved, the fabrication of CQD films is still limited to laboratory-scale small areas because of the complicated deposition of CQD inks. Large-area, uniform deposition of lead sulfide (PbS) CQD inks is successfully realized for photovoltaic device applications by engineering the solute redistribution of CQD droplets. It is shown experimentally and theoretically that the solute-redistribution dynamics of CQD droplets are highly dependent on the movement of the contact line and on the evaporation kinetics of the solvent. By lowering the friction constant of the contact line and increasing the evaporation rate of the droplets, a uniform deposition of CQD ink in length and width over large areas is realized. By utilizing a spray-coating process, large-area (up to 100 cm2 ) CQD films are fabricated with 3-7% thickness variation on various substrates including glass, indium tin oxide glass, and polyethylene terephthalate. Furthermore, scalable fabrication of CQD solar cells is demonstrated with 100 cm2 CQD films which exhibits a notably high efficiency of 8.10%.
CitationChoi, M., Kim, Y., Lim, H., Alarousu, E., Adhikari, A., Shaheen, B. S., … Jung, Y. S. (2019). Tuning Solute-Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum-Dot Optoelectronics. Advanced Materials, 1805886. doi:10.1002/adma.201805886
SponsorsM.-J.C. and Y.K. contributed equally to this work. This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT) (NRF-2017R1A2B2009948 and NRF-2016M3D1A1900035). This work was also supported by the KIST Institutional Program (2E27301).