Source: http://www.google.fr/patents/US6541294?hl=fr
Timestamp: 2013-12-13 02:16:39
Document Index: 579942276

Matched Legal Cases: ['Application No. 6', 'application No. 09', 'application No. 09', 'application No. 09', 'Application No. 7', 'Application No. 8']

Brevet US6541294 - Semiconductor device and manufacturing method thereof - Google�BrevetsRecherche Images Maps Play YouTube Actualit�s Gmail Drive Plus »Connexion Recherche avanc�e dans les brevets BrevetsBy providing appropriate TFT structures arranged in various circuits of the semiconductor device in response to the functions required by the circuits, it is made possible to improve the operating performances and the reliability of a semiconductor device, reduce power consumption as well as realizing...http://www.google.fr/patents/US6541294?utm_source=gb-gplus-shareBrevet US6541294 - Semiconductor device and manufacturing method thereof Recherche avanc�e dans les brevets Num�ro de publicationUS6541294 B1Type de publicationOctroi Num�ro de demandeUS 09/618,930 Date de publication1 avr. 2003 Date de d�p�t18 juil. 2000 Date de priorit�22 juil. 1999�tat de paiement des fraisPay�Autre r�f�rence de publicationUS6743649, US7335911, US7968890, US20030180996, US20040192004, US20090101901, US20110254008 Num�ro de publication09618930, 618930, US 6541294 B1, US 6541294B1, US-B1-6541294, US6541294 B1, US6541294B1 InventeursShunpei Yamazaki, Hideomi Suzawa, Koji Ono, Yasuyuki Arai Cessionnaire d'origineSemiconductor Energy Laboratory Co., Ltd.Exporter la citationBiBTeX, EndNote, RefManCitations de brevets (38), Citations hors brevets (27), R�f�renc� par (73), Classifications (35), �v�nements juridiques (3) Liens externes: USPTO, Cession USPTO, EspacenetSemiconductor device and manufacturing method thereofUS 6541294 B1 R�sum� By providing appropriate TFT structures arranged in various circuits of the semiconductor device in response to the functions required by the circuits, it is made possible to improve the operating performances and the reliability of a semiconductor device, reduce power consumption as well as realizing reduced manufacturing cost and increase in yield by lessening the number of processing steps. An LDD region of a TFT is formed to have a concentration gradient of an impurity element for controlling conductivity which becomes higher as the distance from a drain region decreases. In order to form such an LDD region having a concentration gradient of an impurity element, the present invention uses a method in which a gate electrode having a taper portion is provided to thereby dope an ionized impurity element for controlling conductivity accelerated in the electric field so that it penetrates through the gate electrode and a gate insulating film into a semiconductor layer.
Images(25) Revendications(40)
μ0J=r o t B (Equation 1) - ∂ B ∂ t = rotE ( Equation   2 ) Electrons are accelerated in the θ direction in the induced electric field E and collide with gas molecules, generating plasma. The direction of the induced electric field is the θ direction, and therefore the probability of energy disappearing by charged particles colliding with the reaction chamber walls and the substrate is reduced. Further, there is almost no magnetic field B downstream of the antenna coil 903, and consequently a high density plasma region spread out in a sheet shape is formed. By regulating the high frequency electric power applied to the lower electrode 904, it is possible to independently control the plasma density and the bias voltage applied to the substrate 906. Further, it is also possible to vary the frequency of the applied high frequency electric power in response to the material of the piece to be processed.
A conductive metallic film is formed next by sputtering or vacuum evaporation. Then a resist mask pattern is formed by using a sixth photomask (PM6) and then etched to thereby form source wirings 144 to 148 and drain wirings 149 to 153. The drain wiring 153 here is for functioning as the pixel electrode. A drain wiring 154 indicates the pixel electrode belonging to a neighboring pixel. Although not shown in the figures, in this embodiment, these wirings are formed such that a Ti film is formed at a thickness of between 50 and 100 nm, a contact is formed with a semiconductor film that forms the source or the drain region of the island semiconductor layer, and an aluminum (Al) film is formed at a thickness of between 300 and 400 nm superposing the Ti film(indicated by the reference numerals 144 a to 154 a in FIG. 3C). A transparent conductive film is further formed on top of the aluminum film at a thickness of between 80 and 120 nm (indicated by the reference numerals 144 b to 154 b in FIG. 3C). An indium oxide/zinc oxide alloy (In2O3�ZnO) and a zinc oxide (ZnO) are also suitable materials for the transparent conductive film. In order to further improve the transmissivity of visible light and conductivity, zinc oxide added with gallium (Ga) (ZnO:G), etc. may be used preferably.
Embodiment 2 Examples of using heat-resistant conductive materials such as W and Ta as materials for the gate electrode were shown in Embodiment 1. The reason for using these type of materials resides in that it is necessary to activate the impurity element that was doped into the semiconductor layer for the purpose of controlling the conductive type after the formation of the gate electrode by thermal annealing at between 400� C. and 700� C. By implementing this step, it is necessary that the gate electrode have heat-resistivity. However, this type of heat-resistant conductive material has a sheet resistivity of about 10 Ω, and hence is not always suitable for a liquid crystal display device having a screen size of a 4-inch class or more. This is because if a gate wiring to be connected to the gate electrode is formed of the same material, then the length of the lead wiring on the substrate inevitably becomes large. Thus, the problem of a wiring delay caused by the influence of wiring resistance cannot be ignored.
Embodiment 3 The active matrix substrate manufactured in Embodiment 1 is applicable for a reflection type liquid crystal display device as is. On the other hand, in the case of applying it to a transmission type liquid crystal display device, then it is appropriate to form the pixel electrodes provided in each pixel of the pixel portion with transparent electrodes. A method of manufacturing an active matrix substrate corresponding to the transmission type liquid crystal display device is explained in Embodiment 3 with references to FIGS. 9A to 9D.
Embodiment 5 A method of manufacturing an active matrix liquid. crystal display device from the active matrix substrate fabricated in Embodiment 1 will be explained here in this Embodiment. As shown in FIG. 14A, first a spacer made from a column-shape spacer is formed on the active matrix substrate in the state of FIG. 3C. The spacer may be provided by a method of spraying several μm of grains. A method of forming the spacer by patterning after forming a resin film on the entire surface of the substrate is adopted here in this embodiment. The material for such kind of spacer is not limited. For example, using the JSR product NN700, after application to the substrate by a spinner, a predetermined pattern is formed by exposure and development treatment. Furthermore, it is cured by being heated in a clean oven at 150� C. to 200� C. The shape of the spacer formed in this way may be made different depending on the conditions of the exposure and development treatment. As shown in FIG. 15, the spacer is formed so that its shape becomes a column-shape with a flat top, which is a preferred shape because when an opposing substrate is bonded to this substrate, its mechanical strength as a liquid crystal display panel can be ensured. The shape of the spacer such as a conical shape or a pyramid shape is not specially limited thereto. For example, when the spacer is a conical shape, its specific measurements are as follows: the height H is set between 1.2 and 5 μm, the average radius L1 is set between 5 and 7 μm, and the ratio of the average radius L1 and the radius of the bottom portion L2 is set to 1 to 1.5. The taper angle of the side surface at this point is �15� or less.
Embodiment 7 An active matrix substrate, a liquid crystal display device and an EL type display device manufactured by implementing the present invention can be used in various electro-optical devices. The present invention can then be applied to all electronic appliances that incorporate this kind of electro-optical device as a display medium. The following can be given as this type of electronic appliance: a personal computer; a digital camera; a video camera; a portable information terminal (such as a mobile computer, a portable telephone, and an electronic book); and a navigation system.
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H01L21/77, H01L29/786, H01L29/423, H01L21/84 Classification coop�rativeH01L29/78645, H01L21/32136, H01L29/42384, H01L27/12, H01L29/4908, H01L29/66757, H01L27/1214, H01L29/78621, G02F1/13454 Classification europ�enneH01L29/66M6T6F15A2, H01L27/12T, H01L29/49B, H01L21/3213C4B, H01L29/786D, H01L29/786B4B, H01L29/423D2B8, H01L27/12�v�nements juridiques DateCode�v�nementDescription1 sept. 2010FPAYFee paymentYear of fee payment: 88 sept. 2006FPAYFee paymentYear of fee payment: 411 juil. 2000ASAssignmentOwner name: SEMICONDUCTOR ENERGY LABORATORY CO., LTD., JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAZAKI, SHUNPEI;SUZAWA, HIDEOMI;ONO, KOJI;AND OTHERS;REEL/FRAME:013014/0910;SIGNING DATES FROM 20000630 TO 20000703Owner name: SEMICONDUCTOR ENERGY LABORATORY CO., LTD. 398 HASEFaire pivoterImage d'origineAccueil Google - Plan du site - T�l�chargements par lot sur l'USPTO - R�gles de confidentialit� - Conditions d'utilisation - � propos de Google�Brevets - Envoyer des 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