Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Solar cells based on organic-inorganic halide perovskites already reach efficiencies close to highly optimized silicon solar cells. However, perovskite solar cells suffer from current-voltage hysteresis impeding large-scale commercial applications. Hysteresis is commonly attributed to ion migration within the perovskite layer due to the presence of vacancies, defects, or substitutions. We use admittance spectroscopy and deep-level transient spectroscopy to measure activation energy, density, and attempt-to-escape frequency for ion migration in methylammonium lead triiodide (MAPI) perovskite solar cells. We identify three mobile ion species with activation energies of 0.8, 0.6, and 0.4 eV. We attribute this to vacancy-assisted migration of iodide (I and II) and methylammonium ions respectively. We find that the ion migration is strongly correlated with the observed current-voltage hysteresis. This quantification of mobile ions in MAPI will help to develop a better understanding of ion migration, which will help to develop hysteresis-free perovskite solar cells.
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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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