The metal-induced crystallization of poly-Si and the mobility enhancement of thin film transistors fabricated on a glass substrate
In this study, we report on the fabrication of poly-crystalline silicon (poly-Si) using the metal-induced crystallization (MIC) method and its application to thin film transistors (TFTs). The top gate of the p-type TFTs, whose active layer used MIC poly-Si annealed for 1h at 650C, showed a field effect mobility (?FE) of 7.5cm2/Vs. By increasing the crystallization time to 5h, the quality of the MIC poly-Si was improved. The ?FE increased from 7.5 to 15cm2/Vs. In order to enhance the channel mobility, the Si dangling bonds, which were produced during the transformation from the amorphous phase to the poly-crystalline phase of silicon (Si), were reduced by using plasma hydrogenation. Measurements show that the ?FE reached 45cm2/Vs after passivation by an inductively coupled plasma chemical vapor deposition (ICPCVD) system.
metal-induced crystallization thin film transistor field effect mobility crystallizing time passivation poly-crystal silicon