Tuning Solute-Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum-Dot Optoelectronics.

Min-Jae Choi, YongJoo Kim, Hunhee Lim, Erkki Alarousu, Aniruddha Adhikari, Basamat S. Shaheen, Yong Ho Kim, Omar F. Mohammed, Edward H Sargent, Jin Young Kim, Yeon Sik Jung

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Solution-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%.
Original languageEnglish (US)
Pages (from-to)1805886
JournalAdvanced materials (Deerfield Beach, Fla.)
StatePublished - May 30 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: M.-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).


Dive into the research topics of 'Tuning Solute-Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum-Dot Optoelectronics.'. Together they form a unique fingerprint.

Cite this