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Effect of Thermal Annealing on the Electrical Properties of Inverted Organic Solar Cells Based on PCDTBT: PC70BM Nanocomposites

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Abstract

Inverted organic solar cells based on poly[N-90 0-hepta-decanyl-2,7-carbazole-alt-5,5-(40,70-di-2-thienyl-20,10,30-benzothiadiazole)/[6,6]-phenyl-C61-butyric acid methyl ester [PCDTBT: PC70BM] bulk-heterojunction (BHJ) were elaborated. We have studied the effects of thermal annealing of PCDTBT: PC70BM active layer on electrical properties in dark condition of different elaborated inverted structures. The PCDTBT: PC70BM thin film was sandwiched between indium tin oxide (ITO)/ZnO front and PEDOT:PSS/aluminum (Al) back electrodes in which PEDOT:PSS was a hole transporting layer (HTL) and ZnO was an electron transport layer (ETL). The elaborated inverted device structure was ITO/ZnO/PCDTBT: PC70BM/PEDOT:PSS/Al. The active layer of organic devices were annealed at different temperatures: as cast, 70°C, 110°C, 150°C and 190°C. In this study, we aimed to elaborate inverted organic solar cells (OSCs) with better electrical parameters for photovoltaic applications using different temperatures. The electrical properties have been studied using J–V measurement in dark condition. The different electrical parameters, such as the barrier height ϕb, the ideality factor n and the series resistance Rs, were calculated. The experimental result shows that these parameters depended strongly on the annealing temperature.

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Authors and Affiliations

  1. Équipe Dispositifs Électroniques Organiques et Photovoltaïque Moléculaire, Laboratoire de la Matière Condensée et des Nanosciences, Faculté des Sciences de Monastir, Université de Monastir Avenue de l’environnement, 5019, Monastir, Tunisia

    Asya Mhamdi, Fatma Ben Slama Sweii & Abdelaziz Bouazizi

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  1. Asya Mhamdi
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  2. Fatma Ben Slama Sweii
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  3. Abdelaziz Bouazizi
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Correspondence to Asya Mhamdi.

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Mhamdi, A., Ben Slama Sweii, F. & Bouazizi, A. Effect of Thermal Annealing on the Electrical Properties of Inverted Organic Solar Cells Based on PCDTBT: PC70BM Nanocomposites. J. Electron. Mater. 48, 352–357 (2019). https://doi.org/10.1007/s11664-018-6696-5

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  • DOI: https://doi.org/10.1007/s11664-018-6696-5

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