Polyimide-based ultraviolet-operated nonvolatile photomemory device

Ultraviolet light induced changes in polyimide liquid-crystal alignment films

Ultraviolet light induced changes in polyimide liquid-crystal alignment films were investigated. Infrared, UV-visible, x-ray photoelectron spectroscopy, and electron-spin-resonance measurements indicated that bond breaking and subsequent oxidation reactions occur in polyimide films ~SE7210, OCG284, DuPont 2555 and 2540! during the broadband UV illumination in air. Mechanical rubbing has no effe...

An Electronic Nonvolatile Memory Device Based On Electrostatic Deflection of a Bistable Mechanical Beam

The speed of memory structures is considerably slower than that of logic thus permitting a variety of approaches to achieving and using bistability. We used the bistability of a doubly clamped beam to attain two states that can potentially be used in the implementation of a nonvolatile memory [1]. The device is designed such that a bistable beam acts as the gate of an air gap transistor. In the...

BPDA-PDA Polyimide: Synthesis, Characterizations, Aging and Semiconductor Device Passivation

MTJ-Based Nonvolatile 9T SRAM Cell

This paper presents a spin-transfer torquemagnetic tunnel junction (STT-MTJ) based non-volatile 9-transistor (9T) SRAM cell. The cell achieves low power dissipation due to its series connected MTJ elements and read buffer which offer stacking effect. The paper studies the impact of PVT (process, voltage, and temperature) variations on the design metric of the SRAM cell such as write delay and c...

Alignment of Liquid Crystals on Polyimide Films Exposed To Ultraviolet Light

The influence of unpolarized and linearly polarized UV exposure on previously rubbed as well untreated thin polyimide ͑PI͒ alignment layers was studied. Optical retardation and surface morphology measurements were carried out to understand the nature of surface modification as a function of the polarization and the exposure time of the UV light under different surface conditions. The exposure of ...