Choi, Min-Joe Kim, YongJoo Lim, Hunhee Alarousu, Erkki Adhikari, Aniruddha Shaheen, Basamat S. Kim, Yong Ho Mohammed, Omar F. Sargent, Edward H. Kim, Jin Young Jung, Yeon Sik 2024-01-19T19:32:20Z 2024-01-19T19:32:20Z 2021-09-02 2019-08 0935-9648 https://pubs.kist.re.kr/handle/201004/119722 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 cm(2)) 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 cm(2) CQD films which exhibits a notably high efficiency of 8.10%. English WILEY-V C H VERLAG GMBH SOLAR-CELLS CONTACT LINE INKS DEPOSITION STAINS Tuning Solute-Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum-Dot Optoelectronics Article 10.1002/adma.201805886 1 ADVANCED MATERIALS, v.31, no.32 ADVANCED MATERIALS 31 32 scie scopus 000484239200004 2-s2.0-85066472070 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article SOLAR-CELLS CONTACT LINE INKS DEPOSITION STAINS colloidal quantums dot large-area solar cells solute redistribution