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The ability of thermoelectric power measurements to permit a description of carrier-density and phonon-drag variations caused by photoexcitation was tested in 100-Ω·cm n- and p-type silicon. At low temperatures the major effect of photexcitation is to decrease the phonon-drag contribution to the thermoelectric power by increasing the phonon density in the crystal. At higher temperatures the thermoelectric effect can be used to investigate changes in the electronic contribution due to photoexcitation. An apparently anomalous increase in thermoelectric power with photoexcitation was consistently found in p-type silicon over an intermediate temperature range.

Discoid lupus is an autoimmune disorder with primarily cutaneous manifestations. Carcinomatous changes in discoid lupus can lead to the development of squamous cell carcinoma. While this most often occurs in Caucasians, the presented patient is an African American. She developed numerous squamous cell carcinomas in areas of scarring from discoid lupus. This case illustrates the need for careful observation of discoid lupus for the development of squamous cell carcinoma in the African American patient.