期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 65, 期 9, 页码 3739-3745出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2018.2859272
关键词
Inductively coupled plasma (ICP) treatment; ohmic contact; Schottky-barrier diode (SBD); Schottky-barrier height (SBH); silicon carbide (SiC); specific contact resistance
资金
- Ministry of Science and Technology, Taiwan [MOST 106-2622-E-009-022-CC2, MOST 107-2218-E-009-036]
The effects of Ar inductively coupled plasma (ICP) treatment followed by a 600 degrees C-1000 degrees C rapid thermal annealing (RTA) on the n-type 4H-silicon carbide (SiC) Schottky-barrier diodes and n(+)-implanted ohmic contacts were investigated. The ICP treatment created a 3-nm-thick, sp(2)-C-rich, and amorphous layer at the SiC surface. The RTA repaired the bombardment-induced damages before metal deposition to avoid current degradation. This ICP + RTA-treated surface strongly pinned the Schottky- barrier height (SBH) at a minimum of 0.88 eV. In theory, the low SBH is beneficial to decrease the specific contact resistance (rho(C)). rho(C) of the ICP + RTA-treated Ti ohmic contacts decreased to lower than 10(-5) Omega.cm(2) after 400 degrees C post-metal deposition annealing (PMDA). However, the additional O atoms, fixed in the amorphous layer by RTA, affected the rho(C) reduction. Fortunately, due to the chemical affinity for O of Ti, the in-diffused Ti could contend for the O atoms against the Si-O bonds during the PMDA. Therefore, the oxidized barricade was decomposed gradually, leading to the lowest rho(C), 1.3 x 10(-6) Omega.cm(2), after 600 degrees C PMDA. The lowest rho(C) is 25x and 8x lower than that of the Ni silicide and the nontreated Ti contacts, respectively, at the same doping concentration.
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