Plasma Charging Damage Induced by a Power Ramp Down Step in the end of Plasma Enhanced Chemical Vapour Deposition (PECVD) Process
نویسندگان
چکیده
Plasma Enhanced Chemical Vapour Deposition (PECVD) is one of the main plasma processes which induce charging damage to gate oxides during the VLSI processes. All the previous studies, however, describe the charging phenomena only at the beginning of PECVD process, when a very thin oxide layer covers the metal lines. We present and analyze in this paper, a new strong charging phenomenon in the end of PECVD process when a thick oxide layer already covers and insulates the metal lines. The damage occurs during a plasma power ramp down (PPRD) step. The simultaneous presence of elevated temperatures, UV light, a large perimeter conductor and a highly non uniform plasma during PPRD step, causes the damage of gate oxide. Keywords—plasma charging damage; Plasma Enhanced Chemical Vapour Deposition (PECVD); gate oxide
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