Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
The use of dopant-free hole-transporting material (HTM) for perovskite solar cells (PSC) has recently been proved to protect the perovskite photoactive layer from exposure to ambient environments, thus enhancing the resistance to degradation of perovskite and achieving highly stable devices. In this work, the design of an HTM bearing oligothiophene which is a very important conjugated building block due to its high electron density, charge-carrier mobility and an intensive exposure of its functional aromatic rings to perovskite layer via side-chain engineering is attempted. Two alternating copolymers comprised of a 4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl unit linked with two different thiophene p-spacers, thieno[3,4-b][1,4]dioxepine unit and 2,5-bis(3-hexylthiophen-2-yl)-thieno[3,4-b][1,4]dioxepine unit, were designed, synthesized and characterized. The effects of the π-conjugated spacer units on optical and electrochemical properties, molecular aggregation, film morphology, hole mobilities and performance as dopant-free organic HTM in PSC have been fully investigated. The PSC based on this polymer showed high device stability with a reasonable PSC power conversion efficiency.
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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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