Abstract

In this work, it is demonstrated the application of a high k dielectric, as hafnium oxide (HfO(2)), in poly-Si thin film transistors (TFTs) obtained by metal induced lateral crystallization (MILL). The dielectric layer was deposited at room temperature by sputtering, using argon and oxygen as process gases. As produced TFTs exhibit field effect mobility around 45 cm(2) V(-1) s(-1) and I(on)/I(off) ratio of about 2 x 10(5). After annealing in a forming gas atmosphere for about 1 h at 200 degrees C, the threshold voltage and the sub-threshold slope are reduced, respectively from 4.8 to 2 V and from 1.6 to 1.4 V/dec. Nevertheless, by doing so, we notice a reduction on the field effect mobility of about 45% and a decrease of about 2.5 times on the I(on)/I(off) ratio. Longer annealing time will not improve the TFT's performance.
Original languageEnglish
Pages (from-to)2534-2537
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume354
Issue number19-25
DOIs
Publication statusPublished - 1 May 2008

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