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Operating characteristics of Floating Gate Organic Memory

플로팅 게이트형 유기메모리 동작특성

  • Received : 2014.04.10
  • Accepted : 2014.08.07
  • Published : 2014.08.31

Abstract

Organic memory devices were made using the plasma polymerization method. The memory device consisted of ppMMA(plasma polymerization MMA) thin films as the tunneling and insulating layer, and a Au thin film as the memory layer, which was deposited by thermal evaporation. The organic memory operation theory was developed according to the charging and discharging characteristics of floating gate type memory, which would be measured by the hysteresis voltage and memory voltage with the gate voltage values. The I-V characteristics of the fabricated memory device showed a hysteresis voltage of 26 [V] at 60 ~ -60 [V] double sweep measuring conditions. The programming voltage was applied to the gate electrode in accordance with the result of this theory. A programming voltage of 60[V] equated to a memory voltage of 13[V], and 80[V] equated to a memory voltage of 18[V]. The memory voltage of approximately 40 [%]increased with increasing programming voltage. The charge memory layer charging or discharging according to the theory of the memory was verified experimentally.

유기메모리 제작을 위해 플라즈마 중합법에 의해 절연박막, 터널링 박막을 제작하였고, Au 메모리박막을 이용하여 플로팅게이트형 유기메모리를 제작하였다. 플로팅 게이트형 유기메모리의 메모리층의 전하충전 및 방전에 따른 유기메모리 동작특성을 생각해 보았고, 이를 증명하고자 게이트전압에 따른 히스테리전압 및 메모리전압을 측정하였다. 그 결과 게이트 전압의 인가에 따른 메모리층의 동작 이론을 증명하고자 게이트전압이 증가함에 따른 소스-드레인 전류의 히스테리시스 현상이 심해지는 것을 확인하였고, -60~60[V]전압 인가시 26[V]의 큰 히스테리시스 전압값을 보였다. 또한 게이트 전극에 쓰기전압인가에 따른 현상을 본 결과, 60[V]의 쓰기 전압을 인가하였을 시 13[V]의 memory 전압을 나타내었고, 80[V]의 쓰기전압을 인가하였을 시 18[V]로 memory 전압이 약 40[%] 향상된 수치를 보였다. 이로부터 메모리층의 전하 충전 및 방전에 따른 메모리 동작특성 이론을 실험적으로 검증하였다.

Keywords

References

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