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    • 13. 发明公开
    • Fabrication of self-aligned, T-gate hemt
    • Herstellung von einem selbstausrichtenden T-Gatter-Hemt。
    • EP0430289A2
    • 1991-06-05
    • EP90122995.5
    • 1990-11-30
    • Hughes Aircraft Company
    • Mishra, Umesh K.Thompson, Mark A.Jelloian, Linda M.
    • H01L21/335H01L21/28H01L29/76
    • H01L29/66462H01L21/28587Y10S148/10Y10S148/102Y10S148/143Y10S438/951
    • A generally T-shaped gate (34) is formed by electron beam irradiation of a multilevel resist structure (20) on a substrate (12). The resist structure (20) has an upper layer (24) which is more sensitive to the electron beam than a lower layer (22) thereof. A generally T-shaped opening (30) is formed in the resist structure (20) by etching of the irradiated areas. An electrically conductive metal is deposited to fill the opening and thereby form a T-shaped gate (34) on the substrate (12). After the resist layer structure (20) and metal deposited thereon is removed, a masking layer (40) is formed on the substrate (12) around the gate (34), having an opening therethrough which is aligned with and wider than the cross section of the gate (34), and defining first and second lateral spacings (52, 54) between opposite extremities of the cross section and adjacent edges of the opening. Deposition of an electrically conductive metal forms source and drain metallizations (48,50) on the substrate (12) on areas underlying the first and lateral spacings (52, 54) respectively. The metallizations (48, 50) are self-aligned to the gate (34) and separated therefrom by the masking effect of the gate (34) during the metal deposition. The gate (34') may have an asymmetrical top section (34b') which provides a larger spacing between the gate (34') and source metallization (48) to increase the breakdown voltage of the device. Insulative oxide sidewalls (38) may be formed on the gate.
    • 通常在基板(12)上通过电子束照射多层抗蚀剂结构(20)形成大致T形的栅极(34)。 抗蚀剂结构(20)具有比其下层(22)对电子束更敏感的上层(24)。 通过蚀刻照射区域,在抗蚀剂结构(20)中形成大致T形的开口(30)。 沉积导电金属以填充开口,从而在基板(12)上形成T形门(34)。 在除去抗蚀剂层结构(20)和沉积在其上的金属之后,在栅极(34)周围的基板(12)上形成掩模层(40),该掩模层具有与其横截面对准并且宽于其截面的开口 并且限定在所述横截面的相对两端和所述开口的相邻边缘之间的第一和第二横向间隔(52,54)。 导电金属的沉积分别在第一和侧向间隔(52,54)下方的区域上的基底(12)上形成源极和漏极金属化层(48,50)。 金属化(48,50)在栅极(34)处自对准,并且在金属沉积期间通过栅极(34)的掩蔽效应与其分离。 栅极(34')可以具有不对称的顶部部分(34b'),其在栅极(34')和源极金属化(48)之间提供更大的间隔,以增加器件的击穿电压。 绝缘氧化物侧壁(38)可以形成在栅极上。