Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Low power conversion efficiencies and material instability caused by moisture effects under ambient conditions are the pertinent issues for perovskite solar cells. Herein, an optimal small amount of water additive into methyl ammonium lead iodide (CH3NH3PbI3) solution helps to improve perovskite crystallization and stability of perovskite films. Addition of optimal fraction of water into N, N -dimethylformamide (DMF) results in controlled perovskite growth due to the higher vapour pressure and lower boiling point of water compared to DMF. The optimal water concentration of 1% by volume was found to yield preferential crystallization in the (110) plane, together with improved grain size,smaller amount of pin holes and defects compared to non-water added film. The device performance improved from 10.1% to 12.3% in 1% water added perovskite films, but decreases upon further inclusion of water content. Pump fluence dependent photoluminescence shows the reduced trap density from 4.8´1017 cm-3 to 3.2´1017 cm-3 on inclusion of 1% water to the perovskite film. The presence of the optimal amount of water enhances the charge carrier lifetimes and diffusion lengths in blend film confirmed by the transient measurements and hence improved device performance. We conclude that these detects in perovskite are dominated by surface trap states and inclusion of an optimal amount of water as an additive help to passivate these traps. The ï¬ndings in this work correlates the device performance, thin film morphology with transient dynamics and provide a route to control the growth of crystal perovskites and new insights for improving the stability of organic–inorganic halide perovskites.
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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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