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Download fileOptical and Electrical Properties of Perovskite Variant (CH3NH3)2SnI6
journal contribution
posted on 2018-05-01, 00:00 authored by Fuji Funabiki, Yoshitake Toda, Hideo HosonoIn recent years,
lead halide perovskites have emerged as excellent
photovoltaic materials for solar power generation. However, because
they are toxic and chemically unstable in air, lead-free perovskites
are also being investigated. In this study, the perovskite variant
(CH3NH3)2SnI6 was studied.
Polycrystalline films of (CH3NH3)2SnI6 were prepared using the thermal evaporation method.
The films had a direct band gap of 1.81 eV with a strong absorption
coefficient of ∼7 × 104 cm–1. In addition, the films were n-type with a carrier concentration
of ∼2 × 1015 cm–3 and an
electron mobility of ∼3 cm2 V–1 s–1. Moreover, the conductivity was increased
by a factor of 4 under simulated solar illumination (100 mW cm–2). These results indicate that (CH3NH3)2SnI6 is a lead-free optical semiconductor
suitable for solar cell applications.