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- 저자 : Yasumitsu Matsuo (검색결과 2 건)
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Yasumitsu Matsuo,Junko Hatori,Takehiko Ijichi,Seiichiro Ikehata 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
A field effect transistor (FET) based on the ferroelectric tri-glycine sulfate (TGS) single crystal and pentacene film has been fabricated and the electrical properties have been investigated. It was found that the drain current decreases drastically with the increase of the gate electric field at around 100 V/cm, and shows a minimum at 400 V/cm which corresponds to the coercive electric field of TGS. This decrease of the drain current is caused by the appearance of the depletion layer in the pentacene film. This result indicates that the FET based on the TGS single crystal and pentacene film operates at low gate electric field owing to the rapid generation of the surface charge accompanied by the appearance of the spontaneous polarization in the ferroelectric TGS insulator. It was also found that the drain current does not return to the initial value (before the gate electric field of 450 V/cm is applied) for one week even if the gate electric field is turned from 450 to 0 V/cm. This result indicates that the surface charge of pentacene remains for one week. From these results, it is suggested that the FET based on the TGS single crystal and pentacene film shows the memory effect.
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Electrical properties of fuel cell based on DNA film
Yasumitsu Matsuo,Go Kumasaka,Junko Hatori,Keiko Saito,Seiichiro Ikehata 한국물리학회 2006 Current Applied Physics Vol.6 No.3
We have investigated the electrical properties of a fuel cell based on DNA lm. It is found that open-circuit voltage appears in theDNA lm, optimum condition exists. From the analyses of the frequency dependence of electrical conductivity, it is also found that elec-trical conductivity consists of the component of electrical conductivity caused by the dielectric dispersion, and the component of DCelectrical conductivity. Furthermore, we have found that the ratio,d, of DC conductivity to the component caused by dielectric disper-sion becomes large in the middle-humidity region between 17% and 60% and reaches a maximum at approximately 57% where open-loss are achieved. From these results, it is deduced that optimum conduction of the fuel cell based on DNA lm is determined bynot only the proton conductivity but also by the dielectric loss accompanied by the dielectric dispersion.
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