摘要:
The present invention relates to a method for producing a substrate with at least one covered via that electrically and preferably also thermally connects a first substrate side with an opposite second substrate side. The processing involves forming a trench on a the first substrate side remains and covering the trench with a permanent layer on top of a temporary, sacrificial cap-layer, which is decomposed in a thermal process step. The method of the invention provides alternative ways to remove decomposition products of the sacrificial cap-layer material without remaining traces or contamination even in the presence of the permanent layer This is, according to a first aspect of the invention, achieved by providing the substrate trench with an overcoat layer that has holes. The holes in the overcoat layer leave room for the removal of the decomposition products of the cap-layer material. According to the second aspect of the invention, opening the covered trench from the second substrate side and allowing the cap-layer material to be removed through that opening provides a solution. Both methods of the present invention are based on the common idea of using a temporary cap-layer even in a situation where the substrate opening is permanently covered before the removal of the temporary cap-layer
摘要:
The invention relates to a method of manufacturing a semiconductor device (10) in which, in a semiconductor body (1) with a temporary substrate (2), at least one semiconductor element (3) is formed which, on a side of the semiconductor body (1) opposite to the substrate (2), is provided with at least one connection region (4), and, on the said side, a dielectric (5) is formed and patterned to leave free the connection region (4), after which a metal layer (6) is deposited over the dielectric (5) so as to be in contact with the connection region (4), which metal layer (6) serves as an electric connection conductor of the connection region (4), after which the temporary substrate (2) is removed and the metal layer (6) also serves as a substrate of the device (10). According to the invention, before the metal layer (6) is deposited, there is formed, around the patterned part of the dielectric (5) and around the semiconductor element (3), an annular region (7) of a resin having a larger thickness than the dielectric (5), and the metal layer (6) is deposited within the rectangular annular region (7). In this way, an individual device (10) can readily be formed after the metal layer (6) has been deposited, preferably by pushing the device (10) out of the region (7). Preferably, a (different) photoresist is chosen for the dielectric (5) and the region (7). The invention also comprises a semiconductor device (10) obtained in this way.
摘要:
A method of making a comparatively small substrate (12) compatible with manufacturing equipment for a larger-size standard substrate is disclosed. The standard substrate (1) has a surface (10) in which a depression (8) is formed, in which depression the small substrate is connected by means of a layer of a bonding material (13). The depression is formed so as to have a flat bottom (9) extending parallel to the surface. The depression has a depth such that, after the small substrate has been connected with its rear side to the bottom of the depression of the standard substrate by means of the layer of bonding material, the front side (14) of the small substrate forms a free surface which practically coincides with the surface (10) of the carrier wafer. When the standard substrate with the small substrate positioned in the depression is placed into a lithographic stepper, the free surface of the small substrate is placed automatically in a position such that patterns having very small dimensions can be projected onto a photoresist layer formed on said free surface.
摘要:
The semiconductor device (100) comprises an integrated circuit (20) and a first and a second contact face (31,33). These are connected with vertical interconnects (32,34) to the integrated circuit (20). This integrated circuit (20) is present in a semiconductor layer of a substrate. This substrate is absent in a non-active area (B). This leads to the fact that on the side faces (101) of the device (100) neither conductive material nor parts of the semiconductor substrate are exposed. On lamination of the device between two metallized foils into an identification label, the risk of short-circuitry due to undesired contact at the side face (101) of the device (100), is prevented thereby.
摘要:
The invention relates to a method of manufacturing a thermoelectric device (10), in particular a thermoelectric generator (10), comprising a flexible foil (1) on which two groups (2, 3) of series-connected strip-shaped parts (2A, 3A) are formed, where the materials chosen for the two groups of parts (2A, 3A) are materials with a different thermoelectric coefficient and said two groups of parts are formed in a pattern (100) such that the connections (4) between one part (2A) of one group (2) and another part (3A) of the other group (3) are alternately positioned in two spaced apart areas (G1, G2) of the foil (1), and after the formation of the parts (2A, 3A) on a substrate (5), the foil (1) is attached to the stripshaped parts (2A, 3A), after which the substrate (5) is removed. According to the invention, for the substrate (5) use is made of a rigid (=relatively thick) substrate (5), and before the substrate (5) is removed a rigid (=relatively thick) carrier plate (6) is attached to the foil (1) that is removed again from the foil (1) after removal of the rigid substrate (5). In this way, the method is particularly suitable for the use of semiconductor substrates (5) which can be rapidly removed by chemical-mechanical polishing. Preferably, the foil (1) with the device (10) is folded or coiled before use.
摘要:
A simple method of manufacturing a magnetic head having a head face and including a planar magnetic coil (7) which extends parallel to the head face. According to the method, the magnetic coil is formed at a first side of a first substrate (1). Thereafter, the first substrate provided with the magnetic coil is adhered with its first side to a side of a second substrate, whereafter material of the first substrate is removed from a second side of the first substrate (9), the second side being turned away from the first side, in order to form the head face, in such a manner that the magnetic coil is situated near to the head face.
摘要:
The semiconductor device comprises a substrate (10) with a first (1) and an opposed second side (2), at which first side a plurality of transistors and interconnects is present, which are covered by a protective security covering (16), which device is further provided with bond pad regions (14). The protective security covering (16) comprises a substantially non-transparent and substantially chemically inert security coating (16), and the bond pad regions (14) are accessible from the second side of the substrate (10). The semiconductor device can be suitable made with a substrate transfer technique, in which a second substrate (24) is provided at the protective security covering (16).
摘要:
A method of manufacturing a piezoelectric filter with a resonator comprising a layer of a piezoelectric material (1) which is provided with an electrode (2,3) on either side, which resonator is situated on an acoustic reflector layer (4) formed on a surface (6) of a carrier substrate (7). In the method, the layer of piezoelectric material (1) is provided on a surface (8) of an auxiliary substrate (9), after which a first electrode (2) is formed on the layer of piezoelectric material (1). The acoustic reflector layer (4) is provided on and next to the first electrode (2), and the structure thus formed is secured with the side facing away from the auxiliary substrate (9) on the carrier substrate (7). The auxiliary substrate (9) is removed and a second electrode (3) situated opposite the first electrode (2) is provided.
摘要:
The invention relates to an essentially discrete semiconductor device comprising a semiconductor body (10) having a first, preferably bipolar, transistor (T1) with a first region (1) forming a collector (1) of T1, and a second, preferably also bipolar, transistor (T2) with a second region (2) forming a collector (2) of T2, which transistors (T1, T2) are in a cascode configuration wherein the collector (1) of T1is connected to the emitter (4) of T2. Such a device cannot suitably be used in a base station for mobile communication. According to the invention, the first region (1) and the second region (2) are positioned next to each other within a semiconductor region (5), a part of which situated below the first region (1) is provided with a higher doping concentration at the location of T1. In this way, T1 has a low collector-emitter breakdown voltage and a high cutoff frequency, whereas for T2 said voltage and frequency are, respectively, high(er) and low(er). The resultant device is very suitable, on the one hand, for a high voltage application, for example 28 V, and a high power application, for example 100 W and, on the other hand, the device can still operate at a very high speed and hence is very suitable for the above application. Moreover, the device can be manufactured very easily using a method according to the invention. Preferably, the device is rendered suitable for surface mounting, and the semiconductor body is attached to an isolating substrate (20), while the parts thereof that are situated outside T1 and T2 are removed.
摘要:
A thin-film magnetic head has a semiconductor substrate in which there is an integrated circuit, and on which a magnetic layer structure is arranged. During manufacturing the integrated circuit is formed on one side of the semiconductor substrate, and that side of the semiconductor substrate is then secured to a carrier body by a securing layer. The substrate may then be ground or etched to a thickness less than 35&mgr;m before forming the magnetic layer structure on the opposite side. Securing to the carrier body prevents deformation of the layer structure during manufacturing, so that the resulting head has reproducible properties. Preferably a support body is secured over the layer structure. The head face is then formed such that the layer structure and the support and carrier bodies terminate in it.