Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Stable and non-toxic bismuth iodide, which can address the intrinsic problems of lead based perovskites, has become one of emerging promising materials for solar cell active layer with its prospective optical properties such as narrow band gap (1.7 eV) and high absorption coefficient (105 cm−1).1,2 Despite these promising features, solar cells employing this material has only achieved around 1% yet which is quite far apart from the theoretical limitation from its band gap, 28%.3,4 This unsatisfactory efficiency may come from its very short carrier lifetimes (180-240ps).2 Therefore, efficient separation of mobile excitons is necessary through optimisation of thin film architectures. In this talk, we will present some of our results and progress on optimisation of the device structure for bismuth iodide. In particular, we will report the use of bismuth sulphur iodide interlayers to achieve efficient charge separation. We will also present results from transient optical spectroscopy studies addressing interfacial charge separation dynamics and yields in photoactive layers comprising hole transporting materials and bismuth iodide. Finally, we will present devices based on bismuth iodide absorbers that exhibit power conversion efficiencies > 1.2% efficiency and good operation stability.
References
1. N. J. Podraza, et al., Journal of Applied Physics., 2013, 114, 033110.
2. R. E. Brandt, et al., J. Phys. Chem. Lett., 2015, 6, 4297.
3. U. H. Hamdeh, et al., Chem. Mater., 2016, 28, 6567.
4. W. Shockley and H. J. Queisser, J. Appl. Phys., 1961, 32, 510.
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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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