This trend is more obvious for the sample with thermal annealing (see Figure 3b). Figure 3c depicts the O 1s bonding states near the La2O3/Si interface for the 600°C annealed sample. With Gaussian decomposition, three oxygen bonding states, i.e., La-O, La-O-Si, and Si-O, were found. It indicates that the thermal annealing does not only lead GDC-0994 nmr to the formation of the
interfacial silicate layer, but also results in the Si substrate oxidation. Figure 4 depicts the cross-sectional view of the W/La2O3/Si structure for the sample annealed at 600°C for 30 min; a thick silicate layer of about 2 nm was found at the interface. This thickness of layer is quite substantial as the original film thickness is 5 nm only. With capacitance-voltage measurements, the k value of this layer is estimated to be in the range of 8 to 13. Thus, from the EOT point of view, this layer contributes over 0.5 nm of the total thickness. In addition, the interface roughness was significantly increased which led to further channel mobility degradation. Hence, although some of the device properties may be improved
by forming the BX-795 concentration interfacial silicate layer and SiO2 layer, the silicate or SiO2 layer has much smaller k value and becomes the lower bound of the thinnest EOT. It needs to be minimized for the subnanometer EOT dielectric. Figure 3 XPS results showing the existence of interfacial silicate layer at the La 2 O 3 /Si interface. (a) La 3d spectra of the as-deposited sample. (b) La 3d spectra of the thermally annealed sample. (c) O 1s spectrum taken from the La2O3/Si interface region for the annealed sample. Figure 4 A TEM picture showing the cross-sectional view of the W/La 2 O 3 /Si stack. A silicate layer of about 2 nm
thick was found. It is further noted that the TEM picture also shows a rough interface between La2O3 and W. The rough interface should be due Gemcitabine molecular weight to the oxidation of tungsten and the reaction between La2O3 and tungsten at the interface. Although in real device applications, the W/La2O3 will not undergo such high-temperature annealing, the interface reaction should still exist in a certain extent as a similar phenomenon was also found in the sample which had undergone post-metallization annealing only [14]. Thermal budget and process sequences As mentioned, the interface between the high-k/Si and thermal stability have become the most challenging issues for next-generation subnanometer EOT gate dielectrics. Unlike silicon oxide or silicon nitride, high-k metal oxides are less thermally stable and are easier to be crystallized [1, 18]. A low-temperature treatment such as post-metallization annealing (PMA) of about 350°C may still lead to local crystallization of the selleckchem dielectric [1, 18]. Thermal processing above 500°C will result in the interface oxidation and the formation of a interfacial silicate layer.
Related posts:
- For simplicity, the magnetic moment was then directly measured fr
- This work aims at tuning these parameters to minimize strain and
- In order to avoid the possibility of over-nitridation, a lower am
- J Non-Crystalline Solids 2008, 354:2809–2815 CrossRef 10 Alberti
- To achieve optimum
esthetics, strong all-ceramic cores ar