Stephanie O. Adeyemo, Srabani Kar, S. Silva, I. Jayawardena, Ravi Silva, H. Joyce
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High Charge Carrier Mobilities and Long Diffusion Lengths in Tin Based Metal Halide Perovskite
Tin (Sn)-based perovskites are promising for lower band gap and tandem solar cells due to their red-shifted band gap towards the infrared region. However, Sn based hybrid metal halide perovskite is well known to suffer rapid photoconductivity decay due to the oxidation of Sn2+ to Sn4+ under atmospheric oxygen. Here, the charge carrier dynamics of tin based metal halide perovskite is investigated using optical pump-terahertz probe (OPTP) spectroscopy. Also, the performance of the perovskite films at different annealing temperatures is compared and the best performing temperature is identified. The Sn based perovskite films exhibited a remarkable charge carrier mobility and diffusion length.
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