Photoconductivity in lead chloride and lead bromide

J. F. Verwey, N. G. Westerink

Photoconductivity measurements on PbCl2 and PbBr2 at liquid nitrogen temperature are described. It was found that the holes are the dominant mobile charge carriers in these crystals. The range per unit field was estimated to be 1.2 × 10-4 cm2/V for PbBr2. For PbCl2 the ranges are 4 × 10-4 cm2/V and 0.3 × 10-4 cm2/V for surface and bulk conductivity, respectively. The wavelength dependence indicated that the first maximum at the long wavelength side of the fundamental absorption of PbBr2 and PbCl2 is an exciton peak.

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Materials
Curve 1
Temperature K: ~298 Wavelength Range, µm: 0.378-0.602 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Single crystals (~1 mm thick); grown by zone-refined material by the Bridgman method.
Curve 2
Temperature K: 77 Wavelength Range, µm: 0.342-0.641 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions; data extracted from smooth curve.
Curve 1
Temperature K: ~298 Wavelength Range, µm: 0.52-0.800 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Single crystal (~0.5 mm thick); grown by zone-refined material by the Bridgman method.
Curve 1
Temperature K: ~298 Wavelength Range, µm: 0.312-0.703 Geometry θ' ω': ~0°~0° Composition (weight percent), Specifications, and Remarks: LEAD DICHLORIDE, PbCl₂; single crystal (~1 mm thick); grown from zone-refined material by the Bridgman method.