Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Tin (Sn), a viable substitute for toxic lead (Pb) in hybrid metal halide perovskites is ideal for lower band gap solar cells. A critical challenge for commercialization of perovskite-based solar cells is long-term stability. Using optical pump–terahertz probe (OPTP) spectroscopy, we investigate the effect of ultraviolet (UV) radiation exposure on the charge carrier dynamics of triple cation lead-tin halide perovskite and to assess degradation. The unexposed films showed a higher photoconductivity, a remarkably high charge carrier mobility of ~30 cm2 V-1 s-1, a factor of 4 higher than the UV-exposed films and a long charge carrier diffusion length of ~0.8 μm. The UV-exposed films exhibited faster trap-assisted and bimolecular recombination than the unexposed films.
The authors gratefully acknowledge support from EPSRC DTP Scholarship and ERC (Starting Grant 716471) ACrossWire.
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