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Mixed AgBiS2 nanocrystals for photovoltaics and photodetectors

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10.1039/D2NR00589A
 
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hdl:2117/363570

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Burgués-Ceballos, Ignasi
Wang, Yongjie
Konstantatos, Gerasimos
Document typeArticle
Defense date2022-03-03
PublisherRoyal Society of Chemistry
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
ProjectHEINSOL - Hierarchically Engineered Inorganic Nanomaterials from the atomic to supra-nanocrystalline level as a novel platform for SOLution Processed SOLar cells (EC-H2020-725165)
Abstract
Heavy-metal-free colloidal nanocrystals are gaining due attention as low-cost, semiconducting materials for solution-processed optoelectronic applications. One common limitation of such materials is their limited carrier transport and trap-assisted recombination, which impede the performance of thick photoactive layers. Here we mix small-size and large-size AgBiS2 nanocrystals to judiciously favour the band alignment in photovoltaic and photodetector devices. The absorbing layer of these devices is fabricated in a gradient fashion in order to maximise charge transfer and transport. We implement this strategy to fabricate mixed AgBiS2 thin film solar cells with a power conversion of 7.3%, which significantly surpasses the performance of previously reported devices based on single-batch AgBiS2 nanocrystals. Additionally, this approach allows us to fabricate devices using thicker photoactive layers that show lower dark currents and external quantum efficiencies exceeding 40% over a broad bandwidth – covering the visible and near infrared range beyond 1 μm, thus unleashing the potential of colloidal AgBiS2 nanocrystals in photodetector applications.
CitationBurgués-Ceballos, I.; Wang, Y.; Konstantatos, G. Mixed AgBiS2 nanocrystals for photovoltaics and photodetectors. "Nanoscale", 3 Març 2022, 
URIhttp://hdl.handle.net/2117/363570
DOI10.1039/D2NR00589A
Publisher versionhttps://pubs.rsc.org/en/Content/ArticleLanding/2022/NR/D2NR00589A
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