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Alkali acetate-assisted enhanced electronic coupling in CsPbI3 perovskite quantum dot solids for improved photovoltaics

Alkali acetate-assisted enhanced electronic coupling in CsPbI3 perovskite quantum dot solids for improved photovoltaics
Kim, JigeonKoo, BonkeeKim, Wook. Hyun.Choi, JongminChoi, ChangsoonLim, Sung JunLee, Jong-SooKim, Dae-HwanKo, Min JaeKim, Younghoon
DGIST Authors
Kim, Wook. Hyun.; Choi, JongminChoi, ChangsoonLim, Sung JunLee, Jong-SooKim, Dae-HwanKim, Younghoon
Issue Date
Nano Energy, 66
Article Type
Author Keywords
Colloidal quantum dotsCsPbI3 perovskitesSodium acetateSolar cellsSolids-state ligand exchange
Conventional approachLigand exchangesLong chain hydrocarbonsPhotovoltaic absorbersPhotovoltaic performancePower conversion efficienciesSodium acetateLead compoundsSemiconductor quantum dotsSodium compoundsSolar cellsSolar power generationSolsColloidal quantum dotsLigandsMethanolNanocrystalsPerovskitePerovskite solar cells
Fully inorganic CsPbI3 perovskite quantum dots (CsPbI3-PQDs) are known as the best-performing photovoltaic absorber in colloidal quantum dot solar cells. This is achieved by improving the cubic-phase-stabilization and electronic-coupling in CsPbI3-PQD solids. In conventional approaches, the hydrolysis of methyl acetate (MeOAc) resulting in acetic acid and methanol as intermediate substances plays a key role in replacing long-chain hydrocarbons with short-chain ligands, which improves charge transport in the CsPbI3-PQD solids. However, CsPbI3-PQDs suffer from lattice distortion and instability under acidic conditions including protons and polar media, leading to CsPbI3-PQD fusion and poor photovoltaic performance. Herein, we report that electronic coupling and photovoltaic performance of CsPbI3-PQD solids are improved by efficient removal of long-chain oleate ligands using a solution of sodium acetate (NaOAc) in MeOAc, which results in the direct generation of OAc ions without forming protons and methanol. NaOAc-based ligand exchange of CsPbI3-PQDs enables preservation of their nanocrystal size without fusion and minimization of surface trap states originating from metal hydroxide formation on their surfaces. Consequently, the best solar cell comprising NaOAc-treated CsPbI3-PQDs shows an improved device performance with a power conversion efficiency (PCE) of 13.3%, as compared with a lead nitrate-treated control device (12.4% PCE). © 2019
Elsevier Ltd
Related Researcher
  • Author Choi, Jongmin Chemical & Energy Materials Engineering (CEME) Laboratory
  • Research Interests
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Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles
Division of Nanotechnology1. Journal Articles
Department of Energy Science and EngineeringMNEDL(Multifunctional Nanomaterials & Energy Devices Lab)1. Journal Articles

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