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

Jonghee Yang; Minseon Kim; Seungjin Lee; Jung Won Yoon; Sanchari Shome; Koen Bertens; Hochan Song; Seul Gi Lim; Jae Taek Oh; Sung Yong Bae; Bo Ram Lee; Whikun Yi; Edward H. Sargent; Hyosung Choi

doi:10.1021/acsami.1c06352

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

Jonghee Yang, Minseon Kim, Seungjin Lee, Jung Won Yoon, Sanchari Shome, Koen Bertens, Hochan Song, Seul Gi Lim, Jae Taek Oh, Sung Yong Bae, Bo Ram Lee, Whikun Yi, Edward H. Sargent, Hyosung Choi

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

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,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.

Original language	English
Pages (from-to)	36992-37003
Number of pages	12
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	31
DOIs	https://doi.org/10.1021/acsami.1c06352
Publication status	Published - 2021 Aug 11

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Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

General Materials Science

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title = "Solvent Engineering of Colloidal Quantum Dot Inks for Scalable Fabrication of Photovoltaics",

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,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.",

keywords = "Lewis acid, Lewis base, colloidal quantum dot, large-area photovoltaics, solvent engineering, spray-coating",

author = "Jonghee Yang and Minseon Kim and Seungjin Lee and Yoon, {Jung Won} and Sanchari Shome and Koen Bertens and Hochan Song and Lim, {Seul Gi} and Oh, {Jae Taek} and Bae, {Sung Yong} and Lee, {Bo Ram} and Whikun Yi and Sargent, {Edward H.} and Hyosung Choi",

note = "Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

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language = "English",

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AU - Yang, Jonghee

AU - Kim, Minseon

AU - Lee, Seungjin

AU - Yoon, Jung Won

AU - Shome, Sanchari

AU - Bertens, Koen

AU - Song, Hochan

AU - Lim, Seul Gi

AU - Oh, Jae Taek

AU - Bae, Sung Yong

AU - Lee, Bo Ram

AU - Yi, Whikun

AU - Sargent, Edward H.

AU - Choi, Hyosung

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AB - 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.

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KW - Lewis base

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KW - solvent engineering

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

Abstract

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