Solvent Engineering of Colloidal Quantum Dot Inks for Scalable Fabrication of Photovoltaics
- Authors
- Yang, Jonghee; Kim, Minseon; Lee, Seungjin; Yoon, Jung Won; Shome, Sanchari; Bertens, Koen; Song, Hochan; Lim, Seul Gi; Oh, Jae Taek; Bae, Sung Yong; Lee, Bo Ram; Yi, Whikun; Sargent, Edward H.; Choi, Hyosung
- Issue Date
- Aug-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- solvent engineering; colloidal quantum dot; large-area photovoltaics; spray-coating; Lewis acid; Lewis base
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.13, no.31, pp.36992 - 37003
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 13
- Number
- 31
- Start Page
- 36992
- End Page
- 37003
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/141414
- DOI
- 10.1021/acsami.1c06352
- ISSN
- 1944-8244
- Abstract
- Development of colloidal quantum dot (CQD) inks enables single-step spin-coating of compact CQD films of appropriate thickness, enabling the promising performance of CQD photovoltaics (CQDPVs). Today's highest-performing CQD inks rely on volatile n-butylamine (BTA), but it is incompatible with scalable deposition methods since a rapid solvent evaporation results in irregular film thickness with an uneven surface. Here, we present a hybrid solvent system, consisting of BTA and N,Ndimethylformamide, which has a favorable acidity for colloidal stability as well as an appropriate vapor pressure, enabling a stable CQD ink that can be used to fabricate homogeneous, large-area CQD films via spray-coating. CQDPVs fabricated with the CQD ink exhibit suppressed charge recombination as well as fast charge extraction compared with conventional CQD ink-based PVs, achieving an improved power conversion efficiency (PCE) of 12.22% in spin-coated devices and the highest ever reported PCE of 8.84% among spray-coated CQDPVs.
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