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Schulz D.,Komax Systems LCF SA | Holz E.,Komax Systems LCF SA | Yusoff A.R.B.M.,Federal University of Parana | Song Y.,Komax Systems Malaysia | Shuib S.A.,Komax Systems Malaysia
IEEE Transactions on Electron Devices | Year: 2012

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. © 2006 IEEE.


Bin Mohd Yusoff A.R.,Federal University of Parana | Da Silva W.J.,Federal Technological University of Parana | Song Y.,Komax Systems Malaysia | Holz E.,Komax Systems LCF SA | And 2 more authors.
IEEE Transactions on Electron Devices | Year: 2012

This paper reports the radio frequency (RF) and direct current performance of organic metal-base transistors using double emitter hole injection layers. We report on transistors exhibiting a cutoff frequency (f T) of 430 kHz at room temperature. Besides the cutoff frequency, other important key parameters for RF transistors are current gain and on /off current ratio, which are 293.46 and 50.5, respectively. © 2006 IEEE.


Yusoff A.R.B.M.,Federal University of Parana | Schulz D.,Komax Systems LCF SA | Holz E.,Komax Systems LCF SA | Song Y.,Komax Systems Malaysia | Shuib S.A.,Komax Systems Malaysia
IEEE Transactions on Electron Devices | Year: 2011

This work examines the response of current gain, on-to-off current ratio, and organic magnetocurrent effect (OME) to variations of temperatures and applied magnetic field (MF) for large-band-gap double-emitter nonmagnetic organic transistors (NOTs). The NOTs showed exceptionally high on-to-off ratio up to 10 6. The current gain and OME were 736, and 8%, respectively. With the presence of magnetic field, these features behaved accordingly and explained. © 2011 IEEE.


Schulz D.,Komax Systems LCF SA | Holz E.,Komax Systems LCF SA | Yusoff A.R.B.M.,Federal University of Parana | Song Y.,Komax Systems Malaysia | Shuib S.A.,Komax Systems Malaysia
IEEE Electron Device Letters | Year: 2011

In this letter, we propose an organic transistor using a C 70 sandwich emitter to reduce the leakage current. An off -state leakage current that is smaller than 10 -10 (minimum of 1 ×10 -11A can be achieved (from V CE = 0-5 V and I B=0. The substantially reduced leakage current results in an excellent on-to-off current ratio that is up to 1.8 ×10 6. A small magnetocurrent effect of about 15% is obtained with an optimum emitter thickness. © 2011 IEEE.


Yusoff A.R.B.M.,Federal University of Parana | Song Y.,Komax Systems Malaysia | Holz E.,Komax Systems LCF SA | Schulz D.,Komax Systems LCF SA | Shuib S.A.,Komax Systems Malaysia
IEEE Transactions on Nanotechnology | Year: 2012

In this paper, we examined the influence of magnetic field with different substrate temperatures during the deposition of the Ir(ppy) 3:Ir(mpp) 3 blend layer heterojunction organic nonmagnetic organic transistor. It is shown that substrate heating treatment during evaporation leads to a significant improvement in the nonmagnetic metal-base transistor performance mainly due to an increase in current gain and ON-to-OFF current ratio. This is attributed to the improvement of thermal energy. Upon heating the substrate to 110°C in the presence of magnetic field, current gain and ON-to-OFF current ratio of 281 and 3.30 × 10 6 were obtained compared to 219 and 2.06 × 10 6 for an identical device prepared at 26°C, respectively. Magnetocurrent effect of ∼28% was obtained with applied 2T and 110°C. © 2011 IEEE.

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