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Hybrid dual-stage flow-synthesis of eco-friendly ZnCuInSSe quantum dots for solar cells: Improvement in efficiency using inorganic ligand exchange

Title
Hybrid dual-stage flow-synthesis of eco-friendly ZnCuInSSe quantum dots for solar cells: Improvement in efficiency using inorganic ligand exchange
Author(s)
Hwang, Dae-KueJo, Hyo-JeongKim, Dae-HwanLee, Eui JinChang, Robert P.H.
Issued Date
2023-01
Citation
Journal of Power Sources, v.555
Type
Article
Author Keywords
Quantum-dot-sensitized solar cellHybrid flow reactor methodLigand-exchange procedureSurfactant
ISSN
0378-7753
Abstract
The large-scale synthesis of non-toxic, efficient quantum dots (QDs) is critical for expanding the practical application scope of QD-based photovoltaic (PV) devices. In this study, we synthesize ZnCuInSSe (ZCISSe) QDs on a gram scale (3.5 g) using a hybrid flow reactor method. This method is capable of producing QDs in gram quantities using solid-state chemicals. Additionally, by observing the composition, composition ratio, and reaction temperature, it is possible to produce ZCISSe QDs with highly controllable stoichiometry and a tuneable bandgap. Moreover, to improve the surface conditions of ZCISSe QDs, we propose for the first time the use of different types of surfactants with oleylamine (OAm) and S2− surface ligands via ligand-exchange techniques. Subsequently, we validate the PV quality of the manufactured ZCISSe QDs. Additionally, we develop QD-based solar cells, in which the TiO2 film functions as an n-type semiconductor. The S2--ligand-capped QD solar cell has a 25% higher power conversion efficiency than the OAm-ligand-capped QD solar cell. © 2022 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/17193
DOI
10.1016/j.jpowsour.2022.232344
Publisher
Elsevier BV
Related Researcher
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Appears in Collections:
Division of Energy Technology 1. Journal Articles

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