Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Chemical doping is a powerful method to improve the charge transport and to control the conductivity in organic semi-conductors. Although most of the research community mainly focuses on the achievement of high power conversion efficiencies, moisture degradation of perovskite via ingress through the hole transporter material (HTM) represents a substantial problem. In fact, the commonly used Li-TFSI oxidant (p-doping) for spiro-OMeTAD in solution-processed organic–inorganic perovskite solar cells leads to fast cell degradation. New additives are required to maximize the performance and the long-term stability of thin-film perovskite solar cells. We demonstrate that molybdenum complexes with higher electron affinity than commonly used organic dopants increases the conductivity of the hole transporter by orders of magnitude, and do not diffuse through the material like others. We show improved power conversion efficiency by replacing lithium salts, typical p-dopants for spiro-OMeTAD, with these air-stable dopants as well as a major improvement in device stability. Thus, these new high electron-affinity molybdenum complexes have the potential to replace standard Li-TFSI oxidant.
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International Conference on Hybrid and Organic Photovoltaics
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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