Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Perovskite solar cell (PSC) is an attractive device and since its discovery high conversion efficiencies exceeding 20 % have been found in a short period of time. These high conversion efficiency cells were obtained by combining a mixed-cation mixed-halide type perovskite and the 2,2',7,7'-tetrakis-(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD). However, Spiro-OMeTAD is relatively expensive among the component materials of PSCs. To reduce power generation costs, it is important to replace them with low cost materials. Therefore, we focused on Phthalocyanine which is used extensively as a pigment and an organic semiconductor, and synthesized various derivatives as soluble hole-transporting materials (HTM).
In this presentation, we show the evaluation results of the dopant concentration dependences of the conversion efficiency of PSC using the phthalocyanine derivative as HTM (Pc-HTM). PSCs with doped Pc-HTM showed an increase in conversion efficiency as the dopant concentration increased. Besides that, the highest occupied molecular orbital (HOMO) energy level of Pc-HTM film also changed. Here, HOMO energy level was estimated from the ionization potential measured by ultraviolet photoelectron spectroscopy. As the dopant concentration increased, HOMO energy level decreased and the preferred HOMO energy level for the perovskite layer appeared under certain conditions. It supports that electronic energy level mismatch between HTM and perovskite results in a Voc loss. By optimization, PSC showed conversion efficiency up to 15.6 % using our phthalocyanine derivative and showed its effectiveness as HTM.
This presentation is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
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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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