Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.047
Publication date: 27th October 2017
Small molecule organic solar cells (OSCs) are very interesting in the photovoltaic field since they are expected to open a novel field of solar cells, that is, flexible, light
weight, and potential low-cost photovoltaic cells. In this work, we fabricated inverted structured boron subphthalocyanine chloride (SubPc)/fullerene (C60) based small molecule organic solar cells were fabricated. The effect of bathocuproine (BCP)/Ag doped BCP (Ag:BCP) in inverted organic solar cells was investigated. We demonstrated that BCP layer can be used as a buffer layer in inverted structure OSCs and the device performance was greatly improved. Unfortunately, the device exhibited an anomalous kink in the current density-voltage (J–V) characteristics, namely, an S-shaped J–V curve, leading to a low fill factor and low power conversion efficiency (PCE). To improve device performance, Ag:BCP was used to replace the BCP layer. The results showed that the Ag:BCP layer can eliminate the S-kink in the J–V curve, resulting in a large improvement of fill factor and PCE. The origin of the S-shaped J–V curve was demonstrated to originate from the charge accumulation at the C60/BCP interface. On the contrary, the C60/Ag:BCP interface has favorable electronic properties with beneficial gap states for the transport of free carriers. Together with the good conductivity of Ag:BCP layer and the smooth morphology properties, the device performance was greatly improved by Ag:BCP buffer layer.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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