Charge transport mechanisms of PbSnSe2 and observation of transition from direct to Fowler–Nordheim tunneling
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and
M. A.
Rafiq
*a
Abstract
In this study, we report the observation of various conduction mechanisms in mechanically exfoliated PbSnSe2 based on temperature-dependent current and voltage characteristics. A transition from direct tunneling to Fowler–Nordheim tunneling in PbSnSe2 was observed at 2.63 V. At lower temperatures, the 3D Mott variable range hopping model fits the data, yielding a density of states of ∼8.80 × 1020 eV−1 cm−3 at 2 V. The values of Whop and Rhop were 64 meV and 22.7 nm, respectively, at 250 K. The Poole–Frenkel conduction was observed in the Au/PbSnSe2/Au device and the dielectric constant of PbSnSe2 was calculated to be 1.4. At intermediate voltages, a space charge limited current with an exponential distribution of traps was observed and a trap density of ∼9.53 × 1013 cm−3 and a trap characteristic temperature of 430 K were calculated for the Au/PbSnSe2/Au device.
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