Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
The development of organic-inorganic lead triiodide perovskites as absorbers in the solar cells resulted in a new class of devices that achieved power conversion efficiency (PCE) over 20%.1 Compared with other light to electricity processing devices, the perovskite based ones are distinguished by easy and cheap preparation route, giving rise to the formation of the sensitizer, characterized by high and broad absorption, slow charge recombination, and relatively high charge carriers mobility.2-4 Here, we present time-resolved terahertz (THz) and flash photolysis studies on the charge carriers generation, migration and recombination in formamidinium lead triiodide (FAPbI3) perovskite polycrystalline film.5 The THz measurements indicate high initial charge carrier mobility (75 cm2 V−1 s−1), which remains constant for at least 8 ns, and corresponds to a carrier diffusion length of 25 μm. Following excitation at 800 nm we find decreased mobility (40 cm2 V−1 s−1), which indicates existence of sub-band gap states characterized by lower mobility of the generated charge carriers. Additionally, the THz dynamics show presence of rising components (<1 and 20 ps) attributed to dissociation of excitons having different binding energies. The time constant of 7 and 85 ms resulted from flash photolysis reveal the presence of very long lived trap states.
1. W. S. Yang, et al. Science 2015, 348 (6240), 1234-1237.
2. P. Piatkowski, et al. Phys. Chem. Chem. Phys. 2015, 17 (22), 14674-14684.
3. C. S. Ponseca, et al. J. Am. Chem. Society 2015, 137 (51), 16043-16048.
4. W. Rehman, et al. Adv. Mater. 2015, 27 (48), 7938-7944.
5. P. Piatkowski, et al. J. Phys. Chem. Lett. 2016, 7 (1), 204-10.
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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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