title: Thermal endurance and microstructural evolution of PtGe for high-performance nano-scale Ge-on-Si MOSFETS.
abstract: The thermal endurance and microstructural evolution of Ni-germanide (NiGe) and Pt-germanide (PtGe) on a Ge-on-Si substrate were compared in this paper. In case of the Ni/TiN structure, the sheet resistance exhibited a stable RTP window of 350 to 600 degrees C, while that of the Pt/TiN structure showed more stable characteristics up to 700 degrees C. Furthermore, after post-germanidation annealing, NiGe exhibited the formation of islands due to the severe agglomeration as well as a prominent grain boundary grooving, which accounts for the sharp increase of the sheet resistance from 550 degrees C, whereas PtGe showed a smooth and continuous surface morphological stability without signs of agglomeration even up to 600 degrees C. Although about two times higher resistivity (31.5 micro ohms-cm) and greater Ge consumption (3.27 nm) were shown, PtGe showed more stable sheet resistance, better surface and interface morphological stability and a wider thermal processing window above 100 degrees C than NiGe. Therefore, PtGe is more suitable for the germanided shallow source/drain for nano-scale Ge MOSFETs than NiGe.
authors: Department of Electronics Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors: Min-Ho
authors: MH
authors: Kang
authors: Hong-Sik
authors: HS
authors: Shin
authors: Se-Kyung
authors: SK
authors: Oh
authors: Jung-Ho
authors: JH
authors: Yoo
authors: Ga-Won
authors: GW
authors: Lee
authors: Jung-Woo
authors: JW
authors: Oh
authors: Prashant
authors: P
authors: Majhi
authors: Raj
authors: R
authors: Jammy
authors: Hi-Deok
authors: HD
authors: Lee