Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Chemical doping of organic semiconductors has been recognized as an effective way to enhance the electrical conductivity. In perovskite solar cells (PSCs) various types of dopants have been developed for organic hole transport materials (HTMs). For example, cobalt-based complexes have been added into spiro-OMeTAD, increased its hole conductivity significantly. However, there is luck of understanding of other effects of the dopants on the solar cells performance, such as interfacial recombination. This work intends to investigate the role of the dopants in PSCs. Three copper-based complexes with controlled redox activities are applied as dopants in PSCs, and it is found that the redox potentials of the dopants are crucial for the doping efficiency and conductivity of HTM as well as device performance. It is observed that one of the main limiting factors for the Voc of PSCs is the interfacial charge recombination across perovskite/hole conductor interface. Detailed characterization by electron lifetime and transient photoluminescence measurement suggested that both dopants and the oxidized spiro-OMeTAD (spiro-OMeTAD+) play important roles in the recombination kinetics. This work has demonstrated that the dopants in the HTMs participate in the interfacial recombination and significantly influence the Voc of the devices.
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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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