Solvent Engineering of Colloidal Quantum Dot Inks for Scalable Fabrication of Photovoltaics

Autor:	Whikun Yi, Jung Won Yoon, Sung Yong Bae, Jae Taek Oh, Sanchari Shome, Koen Bertens, Seul Gi Lim, Bo Ram Lee, Jonghee Yang, Edward H. Sargent, Minseon Kim, Seungjin Lee, Hochan Song, Hyosung Choi
Rok vydání:	2021
Předmět:	Colloid Fabrication Materials science Inkwell Quantum dot business.industry Photovoltaics Vapor pressure Energy conversion efficiency Optoelectronics Deposition (phase transition) General Materials Science business
Zdroj:	ACS Applied Materials & Interfaces. 13:36992-37003
ISSN:	1944-8252 1944-8244
DOI:	10.1021/acsami.1c06352
Popis:	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,N-dimethylformamide, 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce06e736cf75a28022b3558f5f9d95a8 https://doi.org/10.1021/acsami.1c06352 Zobrazit plný text záznamu