PHOTO-HALL MEASUREMENT BY AN IMPROVED REDFIELD METHOD

Improvements in electrodes and in instrumentation allow measurement of Hall mobilities as low as 1 cm2/V·sec in photoconducting insulators. Resistance strip electrodes are replaced by parallel wire electrostatic potential dividers. Pulsed photocurrents resulting from electric fields of alternating polarity are averaged in a dual channel boxcar." This signal is then averaged over multiple field sweeps of alternating polarity by a small digital computer. © 1969 The American Institute of Physics."