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Water-resistant AgBiS 2 colloidal nanocrystal solids for eco-friendly thin film photovoltaics

Water-resistant AgBiS 2 colloidal nanocrystal solids for eco-friendly thin film photovoltaics
Oh, Jae TaekBae, Sung YongHa, Su RyongCho, HongjooLim, Sung JunBoukhvalov, Dana W.Kim, YounghoonChoi, Hyosung
DGIST Authors
Lim, Sung JunKim, Younghoon
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Article Type
Lead removal (water treatment)NanocrystalsNanostructured materialsSemiconductor quantum dotsSilver compoundsSolar absorbersSolar power generationSolsSulfur compoundsThin film solar cellsThin filmsWater treatmentBismuth compoundsChemical analysisCrystal structureDensity functional theoryIV-VI semiconductorsLayered semiconductorsLead compoundsX ray photoelectron spectroscopyChemical compositionsColloidal nanocrystalsColloidal quantum dotsPhotoactive materialsPhotovoltaic absorbersSurface hydroxylationsThin film photovoltaicsX ray photon spectroscopySolar cells
Lead-free, water-resistant photovoltaic absorbers are of significant interest for use in environment-friendly and water-stable thin film solar cells. However, there are no reports on the water-resistance characteristics of such photoactive materials. Here, we demonstrate that silver bismuth sulfide (AgBiS 2 ) nanocrystal solids exhibit inherent water resistance and can be employed as effective photovoltaic absorbers in all-solid-state thin film solar cells that show outstanding air and moisture stabilities under ambient conditions. The results of X-ray photon spectroscopy (XPS) and X-ray diffraction (XRD) analyses show that there is no change in the chemical composition and crystal structure of the AgBiS 2 nanocrystal solids after a water treatment. Based on these results, AgBiS 2 nanocrystal solar cells are fabricated. These devices also do not show any drop in performance after a water treatment, confirming that the AgBiS 2 nanocrystal solids are indeed highly water-resistant. In contrast, lead sulfide (PbS) colloidal quantum dot (CQD) solar cells show significant decrease in performance after a similar water treatment. Using XPS analysis and density functional theory (DFT) calculations, we confirm that the iodine removal and the surface hydroxylation of the water-treated PbS CQD solids are the primary reasons for the observed decrease in the device performance of the CQD solar cells. © 2019 The Royal Society of Chemistry.
Royal Society of Chemistry
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