摘要:
A drift layer (81) forms a first main surface (P1) of a silicon carbide layer (101) and has a first conductivity type. A source region (83) is provided to be spaced apart from the drift layer (81) by a body region (82), forms a second main surface (P2), and has the first conductivity type. A relaxing region (71) is provided within the drift layer (81) and has a distance L d from the first main surface (P1). The relaxing region (71) has a second conductivity type and has an impurity dose amount D rx . The drift layer (81) has an impurity concentration N d between the first main surface (P1) and the relaxing region (71). Relation of D rx > L d •N d is satisfied. Thus, a silicon carbide semiconductor device having a high breakdown voltage is provided.
摘要:
A silicon carbide semiconductor device (100) includes an insulation film (126), and a silicon carbide layer (109) having a surface covered with the insulation film (126). The surface includes a first region (R1). The first region (R1) has a first plane orientation at least partially. The first plane orientation is any of a (0-33-8) plane, (30-3-8) plane, (-330-8) plane, (03-3-8) plane, (-303-8) plane, and (3-30-8) plane.
摘要:
On a single-crystal substrate (20), a drift layer (32) is formed. The drift layer (32) has a first surface (S1) facing the single-crystal substrate (20), and a second surface (S2) opposite to the first surface (S1), is made of silicon carbide, and has first conductivity type. On the second surface (S2) of the drift layer (32), a collector layer (30) made of silicon carbide and having second conductivity type is formed. By removing the single-crystal substrate (20), the first surface (S1) of the drift layer (32) is exposed. A body region (33) and an emitter region (34) are formed. The body region (33) is disposed in the first surface (S1) of the drift layer (32), and has the second conductivity type different from the first conductivity type. The emitter region (34) is disposed on the body region (33), is separated from the drift layer (32) by the body region (33), and has first conductivity type.
摘要:
When viewed in a plan view, a termination region (TM) surrounds an element region (CL). A first side of a silicon carbide substrate (SB) is thermally etched to form a side wall (ST) and a bottom surface (BT) in the silicon carbide substrate (SB) at the termination region (TM). The side wall (ST) has a plane orientation of one of {0-33-8} and {0-11-4}. The bottom surface (BT) has a plane orientation of {000-1}. On the side wall (ST) and the bottom surface (BT), an insulating film (8T) is formed. A first electrode (12) is formed on the first side of the silicon carbide substrate (SB) at the element region (CL). A second electrode (14) is formed on a second side of the silicon carbide substrate (SB).
摘要:
A MOSFET (1) includes a semiconductor substrate having a trench formed in a main surface (10A), a gate oxide film (30), a gate electrode (40), and a source interconnection (60). A semiconductor substrate (10) includes an n-type drift layer (12) and a p-type body layer (13). The trench is formed to penetrate the body layer (13) and to reach the drift layer (12). The trench includes an outer peripheral trench (22) arranged to surround an active region when viewed two-dimensionally. On the main surface (10A) opposite to the active region when viewed from the outer peripheral trench (22), a potential fixing region (10C) where the body layer (13) is exposed is formed. The source interconnection (60) is arranged to lie over the active region when viewed two-dimensionally. The potential fixing region (10C) is electrically connected to the source interconnection (60).
摘要:
A substrate has a surface (SR) made of a semiconductor having a hexagonal single-crystal structure of polytype 4H. The surface (SR) of the substrate is constructed by alternately providing a first plane (S1) having a plane orientation of (0-33-8), and a second plane (S2) connected to the first plane (S1) and having a plane orientation different from the plane orientation of the first plane (S1). A gate insulating film is provided on the surface (SR) of the substrate. A gate electrode is provided on the gate insulating film.
摘要:
A termination configuration of a silicon carbide insulating gate type semiconductor device (100) includes a semiconductor layer (132) of a first conductivity type having a first main face (137), a gate electrode (142), and a source interconnection (101), as well as a circumferential resurf region (105). The semiconductor layer (132) includes a body region (133) of a second conductivity type, a source region (134) of the first conductivity type, a contact region (135) of the second conductivity type, and a circumferential resurf region (105) of the second conductivity type. A width of a portion of the circumferential resurf region (105) excluding the body region (133) is greater than or equal to 1/2 the thickness of at least the semiconductor layer (132). A silicon carbide insulating gate type semiconductor device (100) of high breakdown voltage and high performance can be provided.
摘要:
A semiconductor device having a construction capable of achieving suppressed deterioration of electric characteristics in an insulating member is provided. An n- SiC layer (12), a source contact electrode (16) formed on a main surface of the n- SiC layer (12), a gate electrode (17) arranged at a distance from the source contact electrode (16) on the main surface of the n - SiC layer (12), and an interlayer insulating film (210) located between the source contact electrode (16) and the gate electrode (17) are provided. A rate of lowering in electric resistance in the interlayer insulating film (210) when heating to a temperature not higher than 1200°C is carried out while the source contact electrode (16) and the interlayer insulating film (210) are adjacent to each other is not higher than 5 %.
摘要:
Each of first to third impurity regions (11 to 13) of a silicon carbide substrate (10) has a portion located on a flat surface (FT) of a first main surface (P1). On the flat surface (FT), a gate insulating film (21 G) connects the first and third impurity regions (11 and 13) to each other. On the flat surface (FT), a first main electrode (31) is in contact with the third impurity region (13). A second main electrode (42) is provided on a second main surface (P2). A side wall insulating film (21 S) covers a side wall surface (ST) of the first main surface (P1). The side wall surface (ST) is inclined by not less than 50° and not more than 80° relative to a {000-1} plane. In this way, a leakage current is suppressed in a silicon carbide semiconductor device (100).
摘要:
A gate insulating film (201) is provided on a trench (TR). The gate insulating film (201) has a trench insulating film (201A) and a bottom insulating film (201B). The trench insulating film (201 A) covers each of a side wall (SW) and a bottom portion (BT). The bottom insulating film (201B) is provided on the bottom portion (BT) with a trench insulating film (201A) being interposed therebetween. The bottom insulating film (201B) has a carbon atom concentration lower than that of the trench insulating film (201A). The gate electrode (202) is in contact with a portion of the trench insulating film (201A) on the side wall (SW). Accordingly, a low threshold voltage and a large breakdown voltage can be attained.