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Suppressed Degradation and Enhanced Performance of CsPbI3Perovskite Quantum Dot Solar Cells via Engineering of Electron Transport Layers

Suppressed Degradation and Enhanced Performance of CsPbI3Perovskite Quantum Dot Solar Cells via Engineering of Electron Transport Layers
Lim, Sung JunKim, JigeonPark, Jin YoungMin, Jung-wookYun, SeokjinPark, TaihoKim, YounghoonChoi, Jongmin
DGIST Authors
Lim, Sung Jun; Kim, Jigeon; Park, Jin Young; Min, Jung-wook; Yun, Seokjin; Park, Taiho; Kim, Younghoon; Choi, Jongmin
Issue Date
ACS Applied Materials and Interfaces, 13(5), 6119-6129
Author Keywords
CsPbI3 perovskite quantum dotscolloidal quantum dotsphase stabilitysolar cellselectron transport layers
Cell engineeringChlorine compoundsConversion efficiencyElectron transport propertiesNanocrystalsNanostructured materialsOpen circuit voltagePerovskitePhotocatalytic activityPhotocurrentsQuantum chemistrySemiconductor quantum dotsSolar cellsTiO2 nanoparticlesTitanium dioxideAmbient conditionsDevice stabilityElectron transport layersLight-harvestingOperational stabilityPhotocurrent densityPower conversion efficienciesQuantum dot solar cellsLead compounds
CsPbI3 perovskite quantum dots (CsPbI3-PQDs) have recently come into focus as a light-harvesting material that can act as a platform through which to combine the material advantages of both perovskites and QDs. However, the low cubic-phase stability of CsPbI3-PQDs in ambient conditions has been recognized as a factor that inhibits device stability. TiO2 nanoparticles are the most regularly used materials as an electron transport layer (ETL) in CsPbI3-PQD photovoltaics; however, we found that TiO2 can facilitate the cubic-phase degradation of CsPbI3-PQDs due to its vigorous photocatalytic activity. To address these issues, we have developed chloride-passivated SnO2 QDs (Cl@SnO2 QDs), which have low photocatalytic activity and few surface traps, to suppress the cubic-phase degradation of CsPbI3-PQDs. Given these advantages, the CsPbI3-PQD solar cells based on Cl@SnO2 ETLs show significantly improved device operational stability (under conditions of 50% relative humidity and 1-sun illumination), compared to those based on TiO2 ETLs. In addition, the Cl@SnO2-based devices showed improved open circuit voltage and photocurrent density, resulting in enhanced power conversion efficiency (PCE) up to 14.5% compared to that of TiO2-based control devices (PCE of 13.8%). © 2021 American Chemical Society.
American Chemical Society
Related Researcher
  • Author Choi, Jongmin Chemical & Energy Materials Engineering (CEME) Laboratory
  • Research Interests Advanced Metal Oxides; Colloidal Quantum Dots; Perovskite-Quantum Dot Hybrid Nanomaterials; Photocatalytic Materials
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Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles

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