Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We report here a novel electron rich small molecule (H101) which is synthesized based on 3,4-ethylenedioxythiophene . H101 shows similar absorption and emission spectra and thermal properties, compared to 2,2’,7,7’-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9’-spirobifluorene (spiro-OMeTAD). Employed as the hole transporting layer in perovskite-based solar cell, H101 showed very promising results with highest current density of 20.5mA/cm2, highest voltage of 1.06V and thus, the power-conversion-efficiency (PCE, ŋ) reached 13.8 % under AM 1.5G solar simulation. Chemical doping by Cobalt-dopant is employed to improve the fill factor. This device performance is comparable with that obtained using the well-known spiro-OMeTAD, with good repeatability. Stability data results of the device over high temperature storage conditions suggest that H101 outperforms spiro. This is the first reported heterocycle containing material achieving >13 % efficiency in perovskite based solar cell devices. It demonstrates great potential for H101 as a replacement candidate to spiro-OMeTAD considering its much simpler chemical structure and synthesis process.
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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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