Db. Mitzi et al., TRANSPORT, OPTICAL, AND MAGNETIC-PROPERTIES OF THE CONDUCTING HALIDE PEROVSKITE CH3NH3SNI3, Journal of solid state chemistry, 114(1), 1995, pp. 159-163
A low-temperature (T less than or equal to 100 degrees C) solution tec
hnique is described for the preparation of polycrystalline and single
crystal samples of the conducting halide perovskite, CH3NH3SnI3. Trans
port, Hall effect, magnetic, and optical properties are examined over
the temperature range 1.8-300 K, confirming that this unusual conducti
ng halide perovskite is a low carrier density p-type metal with a Hall
hole density, 1/R(H)e similar or equal to 2 x 10(19) cm(-3). The resi
stivity of pressed pellet samples decreases with decreasing temperatur
e with resistivity ratio rho(300 K)/rho(2 K) similar or equal to 3 and
room temperature resistivity rho(300 K) similar or equal to 7 m Omega
-cm. A free-carrier infrared reflectivity spectrum with a plasma edge
observed at approximately 1600 cm(-1) further attests to the metallic
nature of this compound and suggests a small optical effective mass, m
() similar or equal to 0.2. (C) 1995 Academic Press, Inc.