Electronic transport and cyclotron resonance in 2H-PbI2

Abstract

Photoexcited electrons and holes in 2H-PbI₂ are studied by measurements of the Hall effect magnetoconductivity and cyclotron resonance. Transport by holes is dominant below 20K under long-wavelength illumination. Electron transport is dominant under white light illumination below 20K and under all illumination conditions above 20K. Hole mobility is anisotropic with 2< mu _{perpendicular to c}/ mu /sub //c/0 where m₀ is the mass of the free electron. Cyclotron resonance at 137 GHz gives a polaron mass m/sub ///m_{perpendicular to} )¹2/=(0.68+or-0.16)m₀, or a band mass (m_b//m_{b perpendicular to} )¹2/=(0.46+or-0.15)m₀.