Cited 9 time in webofscience Cited 10 time in scopus

High-Voltage and Green-Emitting Perovskite Quantum Dot Solar Cells via Solvent Miscibility-Induced Solid-State Ligand Exchange

Title
High-Voltage and Green-Emitting Perovskite Quantum Dot Solar Cells via Solvent Miscibility-Induced Solid-State Ligand Exchange
Authors
Cho, SinyoungKim, JigeonJeong, Soon MoonKo, Min JaeLee, Jong-SooKim, Younghoon
DGIST Authors
Jeong, Soon MoonLee, Jong-SooKim, Younghoon
Issue Date
2020-10
Citation
Chemistry of Materials, 32(20), 8808-8818
Type
Article
Article Type
Article
Keywords
ALPHA-CSPBI3 PEROVSKITEROOM-TEMPERATUREHALIDE CSPBX3EFFICIENTBRNANOCRYSTALSEMISSIONCLLUMINESCENCEBRIGHT
ISSN
0897-4756
Abstract
Advances in surface chemistry and manipulation of CsPbI3 perovskite quantum dots (PQDs) have enabled the replacement of native long-chain ligands with short-chain ligands, leading to their photovoltaic applications; however, there are no reports on those of wide-bandgap and green-emitting CsPbBr3 PQDs that are promising in high-voltage and colorful building-integrated photovoltaics. Binding energies required for ligand adsorption/desorption alter according to halide compositions of PQDs because of different soft/hard acid/base interactions, and therefore, the surface ligand-exchange process for CsPbBr3 PQDs should be developed. Herein, we demonstrate the utilization of CsPbBr3 PQDs in green light-emitting solar cells with a high open-circuit voltage (VOC) of 1.6 V, realized via solvent miscibility-induced ligand exchange. Carboxylate esters with different alkyl chain lengths are used; longer carboxylate esters show high miscibility with hydrophobic substances, leading to more efficient ligand exchange with preserving CsPbBr3 PQD size but at the same time undesired less film thickness because of the stripping-out of as-cast CsPbBr3 PQDs. Based on these results, we devise a suitably optimized solvent mixture of carboxylate esters to enable efficient ligand exchange with suppressed stripping-out phenomena. Therefore, the resultant CsPbBr3 PQD solids show a power conversion efficiency of 4.23% and a VOC of ∼1.6 V with green electroluminescence under applied voltage. © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/12668
DOI
10.1021/acs.chemmater.0c02102
Publisher
American Chemical Society
Related Researcher
  • Author Lee, Jong-Soo MNEDL(Multifunctional Nanomaterials & Energy Devices Lab)
  • Research Interests Design of new type of multifunctional nanoparticles for energy-related devices; 다기능성 나노재료; 무기물 태양전지; 열전소자
Files:
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Collection:
Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringMNEDL(Multifunctional Nanomaterials & Energy Devices Lab)1. Journal Articles


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