A Novel SONOS Memory With Recessed-Channel Poly-Si TFT via Excimer Laser Crystallization


A silicon–oxide–nitride–oxide–silicon memory with recessed-channel (RC) polycrystalline-silicon (poly-Si) thin-film transistors (TFTs) via excimer-laser crystallization (ELC) has been demonstrated to achieve a high mobility of $sim hbox{400} hbox{cm}^{2}/ hbox{V} cdot hbox{s}$ and a large ON/OFF current ratio of $ sim hbox{10}^{8}$. Such a high performance is because the RC poly-Si TFTs possess only one perpendicular grain boundary (GB) in the channel and the corresponding protrusion at this GB. In addition, the proposed devices also exhibited the largest memory window of 2.63 V in 10 ms with respect to 2.37 and 1.31 V for the conventional-ELC and solid-phase-crystallized ones, respectively. Since the silicon grain growth could be artificially controlled, the device-to-device uniformity could be significantly improved. Therefore, such a simple scheme is promising for applications of low-temperature poly-Si TFTs in 3-D ICs and system on panel.

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