A new process of fabricating inverted-staggered tri-layer thin-filmtransistors |
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Authors: | Wen-Jian Lin Hsiung-Kuang Tsai |
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Affiliation: | Electron. Res. & Servive Organ., Ind. Technol. Res. Inst., Hsinchu; |
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Abstract: | A new method of fabricating a-Si:H TFT with etching-stop structure has been proposed. Only one plasma-enhanced chemical vapor deposition is required in this new method and a PH3/H2 plasma treatment during the deposition has been used to form the TFT contact and thus saved another plasma deposition. With this method, a TFT of 500 Å active layer has been fabricated successfully. The drain current and saturation mobility of this device is 2.4×10-7 A and 0.1 cm2/V sec, respectively, which is comparable to the conventional fabricating method. The plasma treatment will also form an additional leakage path on the TFT top surface and increase the TFT subthreshold slope. However, a current of less than 1 pA at VG=-2.4 V can still be obtained. The possible mechanism of the contact formation by the plasma treatment is also discussed |
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