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Tuning Solute‐Redistribution Dynamics for Scalable Fabrication of Colloidal Quantum‐Dot Optoelectronics
Author(s) -
Choi MinJae,
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
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201805886
Subject(s) - materials science , lead sulfide , fabrication , quantum dot , nanotechnology , solar cell , indium tin oxide , redistribution (election) , deposition (geology) , optoelectronics , thin film , paleontology , alternative medicine , pathology , sediment , politics , political science , law , biology , medicine
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%.