Source: http://www.google.com/patents/US8148779?dq=4168396
Timestamp: 2013-12-08 19:38:16
Document Index: 666552022

Matched Legal Cases: ['Application No. 2008', 'Application No. 10', 'Application No. 09', 'Application No. 10', 'Application No. 200910138568', 'Application No. 09251688', 'Application No. 09250845']

Patent US8148779 - Thin film transistor, method of manufacturing the same and flat panel ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA thin film transistor (TFT) using an oxide semiconductor as an active layer, a method of manufacturing the TFT, and a flat panel display device having the TFT include a gate electrode formed on a substrate; an active layer made of an oxide semiconductor and insulated from the gate electrode by a gate...http://www.google.com/patents/US8148779?utm_source=gb-gplus-sharePatent US8148779 - Thin film transistor, method of manufacturing the same and flat panel display device having the samePublication numberUS8148779 B2Publication typeGrantApplication numberUS 12/352,851Publication dateApr 3, 2012Filing dateJan 13, 2009Priority dateJun 30, 2008Also published asCN101621075A, CN101621075B, EP2141743A1, US20090321731, US20120153278Publication number12352851, 352851, US 8148779 B2, US 8148779B2, US-B2-8148779, US8148779 B2, US8148779B2InventorsTae-kyung Ahn, Jong-Han Jeong, Jae-Kyeong Jeong, Min-Kyu Kim, Yeon-Gon Mo, Hui-Won YangOriginal AssigneeSamsung Mobile Display Co., Ltd.Patent Citations (24), Non-Patent Citations (7), Referenced by (22), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetThin film transistor, method of manufacturing the same and flat panel display device having the sameUS 8148779 B2Abstract A thin film transistor (TFT) using an oxide semiconductor as an active layer, a method of manufacturing the TFT, and a flat panel display device having the TFT include a gate electrode formed on a substrate; an active layer made of an oxide semiconductor and insulated from the gate electrode by a gate insulating layer; source and drain electrodes coupled to the active layer; and an interfacial stability layer formed on one or both surfaces of the active layer. In the TFT, the interfacial stability layer is formed of an oxide having a band gap of 3.0 to 8.0 eV. Since the interfacial stability layer has the same characteristic as a gate insulating layer and a passivation layer, chemically high interface stability is maintained. Since the interfacial stability layer has a band gap equal to or greater than that of the active layer, charge trapping is physically prevented.
wherein the interfacial stability layer directly contacts at least one of an entire top surface and an entire bottom surface of the active layer. Description
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to and the benefit of Korean Patent Application No. 2008-62418, filed on Jun. 30, 2008, in the Korean Intellectual Property Office, the entire content of which is incorporated herein by reference.
SUMMARY OF THE INVENTION Accordingly, aspects of the present invention provide a thin film transistor (TFT) capable of improving interfacial characteristics of an active layer, a method of manufacturing the same, and a flat panel display device having the same.
DETAILED DESCRIPTION OF THE EMBODIMENTS In the following detailed description, only certain exemplary embodiments of the present invention have been shown and described, simply by way of illustration. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. In addition, when an element is referred to as being �on,� �formed on,� or �disposed on� another element, it can be directly on, formed directly on, or disposed directly on the element or one or more intervening elements may be disposed therebetween. Also, when an element is referred to as being �connected to,� �coupled to,� or �electrically coupled to� another element, it can be directly connected to the element or be indirectly connected to the element with one or more intervening elements interposed therebetween. Hereinafter, like reference numerals refer to like elements.
FIG. 7A is a graph showing reliability measurement results of a TFT according to aspects of the present invention in which an interfacial stability layer is formed by depositing an aluminum oxide (AlOx) using a physical method. Since a threshold voltage (Vth), an S-factor (Sub-threshold slope-factor), and an off-current were negligibly changed after a temperature was increased from a room temperature to 100� C., the TFT has an excellent reliability. FIG. 7B is a graph showing reliability measurement results of a TFT according to aspects of the present invention in which an interfacial stability layer is formed by depositing a silicon oxide (SiOx) using a plasma enhanced chemical vapor deposition (PECVD). As a temperature increased, a threshold voltage (Vth) was changed in a negative direction, and a slop-factor was degraded.
FIG. 8C is a graph showing stress measurement results of a TFT according to aspects of the present invention in which an interfacial stability layer is formed using a silicon oxide (SiOx). The silicon oxide (SiOx) is generally used in manufacturing a poly-silicon TFT, and a thermal oxide (SiO2) formed at a temperature of 900� C. using a dry (O2) or wet (H2O) thermal oxidation method as the silicon oxide (SiOx). When a voltage VGS of 15V was applied to a gate electrode for 1 hour, the change in threshold voltage (Vth) was 2.1V, and when a voltage VGS of −15V was applied to the gate electrode for 1 hour, the change in threshold voltage (Vth) was −2.8V. Therefore, it can be seen that reliability of the TFT is remarkably improved as compared with the conventional TFT through the results of FIGS. 8A and 8B.
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No. 12/424,860, filed Apr. 16, 2009, Min-Kyu Kim et al., Samsung Mobile Display Co., Ltd.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8344387Nov 24, 2009Jan 1, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the sameUS8367489Nov 22, 2010Feb 5, 2013Semiconductor Energy Laboratory Co., Ltd.Method of fabricating a stacked oxide material for thin film transistorUS8384079Jul 29, 2010Feb 26, 2013Semiconductor Energy Laboratory Co., Ltd.Oxide semiconductor deviceUS8420441Jul 29, 2010Apr 16, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing oxide semiconductor deviceUS8421067Jul 29, 2010Apr 16, 2013Semiconductor Energy Laboratory Co., Ltd.Oxide semiconductor deviceUS8421083Jul 29, 2010Apr 16, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device with two oxide semiconductor layers and manufacturing method thereofUS8426868Oct 23, 2009Apr 23, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the sameUS8440510May 10, 2011May 14, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8461007Apr 21, 2011Jun 11, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8461584Mar 25, 2011Jun 11, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device with metal oxide filmUS8492757Mar 4, 2010Jul 23, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the sameUS8492758Sep 22, 2010Jul 23, 2013Semiconductor Energy Laboratory Co., Ltd.Oxide semiconductor film and semiconductor deviceUS8502221Mar 29, 2011Aug 6, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device with two metal oxide films and an oxide semiconductor filmUS8530285Dec 22, 2010Sep 10, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8530289Apr 21, 2011Sep 10, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8536571Jan 9, 2012Sep 17, 2013Semiconductor Energy Laboratory Co., Ltd.Manufacturing method of semiconductor deviceUS8546180Jul 29, 2010Oct 1, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing oxide semiconductor deviceUS8546182Nov 19, 2012Oct 1, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the sameUS8546225Apr 21, 2011Oct 1, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8551810Mar 25, 2011Oct 8, 2013Semiconductor Energy Laboratory Co., Ltd.Method for manufacturing semiconductor deviceUS8552434Nov 19, 2012Oct 8, 2013Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the sameUS20110062435 *Sep 13, 2010Mar 17, 2011Semiconductor Energy Laboratory Co., Ltd.Semiconductor device and method for manufacturing the same* Cited by examinerClassifications U.S. Classification257/347, 257/E21.002, 257/72, 257/59, 257/E21.476International ClassificationH01L29/12, H01L21/02, H01L31/0256, H01L31/00Cooperative ClassificationH01L29/7869, H01L29/78696, H01L29/4908European ClassificationH01L29/786K, H01L29/786S, H01L29/49BLegal EventsDateCodeEventDescriptionAug 29, 2012ASAssignmentFree format text: MERGER;ASSIGNOR:SAMSUNG MOBILE DISPLAY CO., LTD.;REEL/FRAME:028868/0413Owner name: SAMSUNG DISPLAY CO., LTD., KOREA, REPUBLIC OFEffective date: 20120702Jan 16, 2009ASAssignmentOwner name: SAMSUNG MOBILE DISPLAY CO., LTD., KOREA, REPUBLICFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JEONG, JAE-KYEONG;JEONG, JONG-HAN;KIM, MIN-KYU;AND OTHERS;REEL/FRAME:022164/0973Effective date: 20090112RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google