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Nano-crater morphology in hybrid electron-collecting buffer layers for high efficiency polymer:nonfullerene solar cells with enhanced stability

Abstract

Organic solar cells based on solution processes take strong advantages over conventional silicon solar cells due to possible low-cost manufacturing of flexible large-area solar modules at low temperatures. However, the benefit of low temperature process is faded by thermal annealing step at high temperatures (≥200 oC), which cannot be practically applied for typical plastic film substrates with glass transition temperatures lower than 200 oC, for inorganic charge-collecting buffer layers such as zinc oxide (ZnO) in high efficiency inverted-type organic solar cells. Here we demonstrate that novel hybrid electron-collecting buffer layers with a particular nano-crater morphology, which are prepared by the low-temperature (150 oC) thermal annealing process of ZnO precursor films containing poly(2-ethyl-2-oxazoline) (PEOz), can deliver high efficiency (12.35%) similar to the pristine ZnO layers prepared by conventional high-temperature process (200 oC) for inverted-type polymer:nonfullerene solar cells. The nano-crater morphology was found to greatly enhance the stability of solar cells due to the improved adhesion between the acitve layers and ZnO:PEOz hybrid buffer layers.

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Publication details

The article was received on 21 Sep 2018, accepted on 23 Nov 2018 and first published on 24 Nov 2018


Article type: Communication
DOI: 10.1039/C8NH00319J
Citation: Nanoscale Horiz., 2018, Accepted Manuscript
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    Nano-crater morphology in hybrid electron-collecting buffer layers for high efficiency polymer:nonfullerene solar cells with enhanced stability

    J. Seo, S. Nam, H. Kim, D. Bradley and Y. Kim, Nanoscale Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C8NH00319J

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