High-performance poly-Si TFTs fabricated by implant-to-silicide technique

Abstract

High-performance poly-Si thin-film transistors (TFTs) with fully silicided source/drain (FSD) and ultrashort shallow extension (SDE) fabricated by implant-to-silicide (ITS) technique are proposed for the first time. Using the FSD structure, the S/D parasitic resistance can be suppressed effectively. Using the ITS technique, an ultrashort and defect-free SDE can also be formed quickly at about 600 degreesC. Therefore, the FSD poly-Si TFTs exhibits better current-voltage characteristics than those of conventional TFTs. It should be noted that the on/off current ratios of FSD poly-Si TFT (W/L = 1/4,mum) is over 3.3 x 10(7), and the field-effective mobility of that device is about 141.6 (cm(2)/Vs). Moreover, the superior short-channel characteristics of FSD poly-Si TFTs are also observed. It is therefore believed that the proposed FSD poly-Si TFT is a very promising TFT device.