Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
The electron transport layer(ETL), one of the most vital components for high performing perovskite solar cells (PSCs), plays an important role in extracting the photogenerated electrons from perovskite and transporting these charges to electrodes and simultaneously assists as a hole blocking layer to suppress charge recombination. In general, TiO2 is most commonly employed as an ETL in PSCs due to the fast electron injection rates from perovskite to TiO2, easy fabrication, non-toxicity, and chemical stability [1]. However, the low electron mobility and transport properties may influence a negative impact on device performance[2]. The electronic properties of TiO2 can be modified in an efficient way by doping with one or more other elements such as alkali metals, non-metals, metalloids, transition metals, post-transition metals, and lanthanides [3].
In this work, we report on the effect of alkali Lithium metal doping of mesoporous TiO2 used as an ETL in the CH3NH3PbI3 PSCs. The surface morphology, optical properties, charge carrier dynamic, electron mobility, electrical conductivity, photovoltaic performance and hysteresis behavior of various lithium concentration of mesoporous TiO2 were systematically investigated. The experimental results indicate that the improved electron carrier extraction and collection efficiency, reduced electronic trap states, and higher electron mobility contribute to the superior performance of the PSCs utilizing Lithium-doped mesoporous TiO2. The power conversion efficiency (PCE) of the PSC was significantly enhanced from 13.64 % to 17.59 % with an optimized lithium doping concentration of 30mg/ml while reducing the J-V curve hysteresis behavior.
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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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