An image-forming member for electrophotography comprises a photoconductive layer including as constituting layers, a hydrogenated amorphous silicon layer and an amorphous inorganic semiconductor layer. The amorphous inorganic semiconductor layer is laminated on the hydrogenated amorphous silicon layer to thereby provide a heterojunction.
This application is a division, of application Ser. No. 141,158, filed Jan. 6, 1988, now abandoned which in turn is a division of application Ser. No. 077,102, filed July 23, 1987, now issued as U.S. Pat. No. 4,737,428, which is turn is a division of application Ser. No. 923,027, filed Oct. 24, 1986, now issued as U.S. Pat. No. 4,701,394, which in turn is a continuation of application Ser. No. 358,356, now issued as U.S. Pat. No. 4,673,628, which is turn is a continuation of application Ser. No. 131,495, filed Mar. 18, 1980, now abandoned.
An improved photoelectric converter with reduced dark current includes a first electrode on a substrate covered by a semiconductor layer for photoelectric conversion. A second electrode is disposed on the semiconductor layer. An electron injection preventive layer is inserted between the semiconductor layer and the second electrode for preventing electrons from being injected from the second electrode into the semiconductor layer. The electron injection preventive layer is formed of a material satisfying the inequality: where the work function of the second electrode is .phi..sub.M, the electron affinity of the electron injection preventive layer is x.sub.2, and the band gap energy of the semiconductor layer is Eg.sub.1.
A process for preparing an electrophotographic imaging member having a coating of photoconductive particles dispersed in a polymerizable film forming monomer, which when polymerized forms a charge generating layer.
Methods are provided for improved production of hIL-3 either in glycosylated form from mammalian and yeast cells or in unglycosylated form from prokaryotes. Recombinantly produced human IL-3 is purified in a series of steps, initially employing hydrophobic interaction, followed by ion exchange chromatography and gel filtration.
