Flash2009_Pres - Flash Memory By: Matt Gorman David...

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Flash Memory By: Matt Gorman David Martinsek Jeremy Nuzzo Andrew Werner
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Agenda Why flash memory? How it gets programmed Basic design Fowler Nordheim Tunneling Capacitors in flash memory Capacitors Dielectrics Materials Gate Coupling Ratio Hot electron effect Current problems and Future of flash memory Demonstration
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Why Flash Memory?
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Why Flash Memory? Key Uses: iPods Netbooks Photo storage Disadvantages: Slower read-write speed Long-term storage unreliable Advantages: Low power consumption Small size Portable Non-volatile
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How Flash Memory Gets Programmed
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Flash Memory Basic Design Floating gate and control gate are both transistors When electrons are present on the floating gate, no current flows through the transistor, indicating logic 0. The transistor is conducting, indicating logic 1, when electrons are removed from the floating gate. The process of forcing electrons to/from floating gate is achieved by applying a voltage between a control gate and source or drain and called Fowler-Nordheim (F-N) Tunneling.
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What Is Tunneling? Ability of electrons to move through a barrier Importance: Prevents electrons from flowing freely between gates
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Wave Particle Duality Double slit experiment: Wave – like behavior Photoelectic effect: Particle – like behavior
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Tunneling Electron acting as particle Electron acting as wave
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Energy Required for Tunneling
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Writing Flash Apply voltage to control and drain Programmed = 0
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Erasing Flash Apply voltage to control and source Erased = 1
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Flash Bits
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Capacitors in Flash Memory
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Flash2009_Pres - Flash Memory By: Matt Gorman David...

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