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/<4. The mobility of electrons above 30K, when limited by optical phonon scattering may be fitted by an effective band mass of 0.55 m0 where m0 is the mass of the free electron. Cyclotron resonance at 137 GHz gives a polaron mass m/sub ///mperpendicular to )12/=(0.68+or-0.16)m0, or a band mass (mb//mb perpendicular to )12/=(0.46+or-0.15)m0.
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