Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Planar heterojunction perovskites are particular suitable for tandem solar cells, because they can be low-temperature processed with a tunable bandgap directly on the bottom solar cell. Nevertheless, the highest reported power conversion efficiencies for planar perovskite solar cells are significantly lower than those collected from devices prepared with mesoscopic TiO2 at high temperature. In this work we demonstrate a low-temperature, planar perovskite solar cells with a record stabilized power conversion efficiency of 19.5% under AM1.5 full solar light. This was achieved using small amout of specific ionic liquids, methylammonium formate (MAF) as additives to retard the perovskite crystal growth, aiming for a compact perovskite layer with larger grains. MAF has relatively lower viscosity and boiling point 162.1°C than typical ionic liquids as well as it has the same cation (methylammonium) used in the perovskite composition and thus good affinity with the perovskite. We present an ionic liquid driven mechanism of crystal growth and we demonstrate that the larger perovskite grains enable more effective charge collection and thus better solar cell performances.
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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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