2021
DOI: 10.3390/nano11112909
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Lithium-Based Upconversion Nanoparticles for High Performance Perovskite Solar Cells

Abstract: In this work, we report an easy, efficient method to synthesize high quality lithium-based upconversion nanoparticles (UCNPs) which combine two promising materials (UCNPs and lithium ions) known to enhance the photovoltaic performance of perovskite solar cells (PSCs). Incorporating the synthesized YLiF4:Yb,Er nanoparticles into the mesoporous layer of the PSCs cells, at a certain doping level, demonstrated a higher power conversion efficiency (PCE) of 19%, additional photocurrent, and a better fill factor (FF)… Show more

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Cited by 7 publications
(5 citation statements)
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“…To explore the water solubility of the synthesized oleate-capped particles without losing their good optical properties, a surface–ligand exchange experiment was carried out. For this, the synthesized oleate-capped UCNPs were dispersed in acidic ethanol with a pH equal to 1 under strong sonication for one hour and collected after appropriate washing steps [ 19 , 22 ]. Details on this surface–ligand exchange method can be found in Materials and Methods.…”
Section: Resultsmentioning
confidence: 99%
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“…To explore the water solubility of the synthesized oleate-capped particles without losing their good optical properties, a surface–ligand exchange experiment was carried out. For this, the synthesized oleate-capped UCNPs were dispersed in acidic ethanol with a pH equal to 1 under strong sonication for one hour and collected after appropriate washing steps [ 19 , 22 ]. Details on this surface–ligand exchange method can be found in Materials and Methods.…”
Section: Resultsmentioning
confidence: 99%
“…The synthesized oleate-capped LiYF4:Yb,Er UCNPs (1.0 mL) were dispersed in a volume of 30 mL of acidic ethanol solution (pH = 1). The acidity of the ethanol solution was adjusted by concentrated hydrochloric acid [ 22 ]. A strong sonication was applied to the solution for 1 h to remove the oleate ligands and allow hydroxide ligand formation on the UCNPs’ surface.…”
Section: Methodsmentioning
confidence: 99%
“…Under a green excitation at an intensity of 20 W•cm −2 , the perovskite film in the UC-PSC device showed a strong emission peak at 780 nm, higher than that of the pristine film, as shown in Figure 3a. This observation could be attributed to the following explanations: first, that the grain boundaries were reduced by the electrodeposited UC thin films [27], second, that the non-radiative recombination was suppressed, and third, that the defect trap states were minimized [10,27]. Proceeding, we experimentally performed photocurrent density-voltage curves (J-V) under 1-sun illumination at AM 1.5 G to test the photovoltaic performance of the fabricated PSC devices.…”
Section: Resultsmentioning
confidence: 99%
“…Their ability to upconvert one or more low-energy NIR photons to one high-energy visible photon, as well as their photostability and photoluminescence tunability, opens the door for advanced and promising applications [1][2][3][4][5]. These include bio-applications, quantum sensing, optoelectronics, superresolution microscopy, and renewable energy [6][7][8][9][10][11][12][13][14][15].…”
Section: Introductionmentioning
confidence: 99%
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