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We present nonmagnetic organic transistors with wideband-gap polymer:bis[(4,6-difluorophenyl)pyridinato-N, \C^2]-(picolinato)iridium(III) (P36HCTPSi:FIrpic) mixed heterojunctions, achieving a high stable current gain of 73 and 14% organic magnetocurrent effect over a wide range of collector–emitter voltages and an external magnetic field, respectively. We employed a substrate heating treatment technique during deposition of the mixed emitter layer to achieve low surface roughness and, consequently, improved the on-to-off current ratio of around \10^5. [ABSTRACT FROM PUBLISHER]

We have studied the effects of the fullerene \C70 on the device performance of a composite-emitter multilayer metal-base transistor (MBT). It is shown that the higher molecular weight leads to high common–emitter current gain \beta of over 252 in a wide range of collector–emitter voltage. By selecting an appropriate maximum and minimum base current IB, an on-to-off current ratio \4.73 \times \10^6 is achieved. This is a substantial improvement over an identical MBT employing \C60 having \beta = \8 and on-to-off current ratio 4.25. [ABSTRACT FROM AUTHOR]