Journal
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS
Volume 42, Issue 4A, Pages L347-L349Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.42.L347
Keywords
ZnO; CaHfOx; TFT; pulsed laser deposition; field effect mobility
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We have fabricated high performance ZnO thin film transistors (TFTs) using CaHfOx, buffer layer between ZnO channel and amorphous silicon-nitride gate insulator. The TFT structure, dimensions, and materials set are identical to, those of the commercial amorphous silicon (a-Si) TFTs in active matrix liquid crystal display, except for the channel and buffer layers replacing a-Si. The field effect mobility can be as high as 7 cm(2).V-1.s(-1) for devices with maximum process temperature of 300degreesC. The process temperature can be reduced to 150degreesC without much degrading the performance, showing the possibility of the use of polymer substrate.
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