TWI783830B - Semiconductor device - Google Patents
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本揭露係關於半導體裝置,特別是關於一種包含高電子遷移率電晶體的半導體裝置。The present disclosure relates to semiconductor devices, and more particularly to a semiconductor device including high electron mobility transistors.
在半導體技術中,III-V族的化合物半導體可用於形成各種積體電路裝置,例如:高功率場效電晶體、高頻電晶體或高電子遷移率電晶體(high electron mobility transistor, HEMT)。HEMT是屬於具有二維電子氣(two dimensional electron gas, 2-DEG)的一種電晶體,其2-DEG會鄰近於能隙不同的兩種材料之間的接合面(亦即,異質接合面)。由於HEMT並非使用摻雜區域作為電晶體的載子通道,而是使用2-DEG作為電晶體的載子通道,因此相較於習知的金氧半場效電晶體(MOSFET),HEMT具有多種吸引人的特性,例如:高電子遷移率及以高頻率傳輸信號之能力。In semiconductor technology, III-V compound semiconductors can be used to form various integrated circuit devices, such as high-power field-effect transistors, high-frequency transistors, or high electron mobility transistors (high electron mobility transistors, HEMTs). HEMT is a type of transistor with two dimensional electron gas (2-DEG), and its 2-DEG will be adjacent to the junction between two materials with different energy gaps (ie, heterogeneous junction) . Since HEMT does not use the doped region as the carrier channel of the transistor, but uses 2-DEG as the carrier channel of the transistor, compared with the conventional metal oxide half field effect transistor (MOSFET), HEMT has many attractive features. Human characteristics such as high electron mobility and the ability to transmit signals at high frequencies.
半橋電路(half-bridge circuit)在電力電子領域的應用非常廣泛,當半橋電路的上橋(high side)開關元件和下橋(low side)開關元件共用同一個基底時,容易受到串接干擾(cross talk)的影響,因此很難實現系統單晶片(System on a Chip, SoC)的半橋電路。HEMT可以應用在半橋電路,作為半橋電路的上橋開關元件和下橋開關元件,達到系統單晶片(SoC)的好處,然而,當HEMT應用在半橋電路時,仍然存在一些需要克服的問題。Half-bridge circuits (half-bridge circuits) are widely used in the field of power electronics. When the high-side switching elements and low-side switching elements of the half-bridge circuit share the same substrate, they are vulnerable to series connection. Due to the influence of cross talk, it is difficult to implement a half-bridge circuit of a System on a Chip (SoC). HEMT can be applied in a half-bridge circuit as the upper-bridge switching element and lower-bridge switching element of the half-bridge circuit to achieve the benefits of a system on a chip (SoC). However, when HEMT is applied in a half-bridge circuit, there are still some problems to be overcome. question.
有鑑於此,本揭露提出一種包含改良背極的高電子遷移率電晶體之半導體裝置,以解決高電子遷移率電晶體應用在半橋電路時所面臨的問題。In view of this, the present disclosure proposes a semiconductor device including a high electron mobility transistor with an improved back electrode to solve the problems faced when the high electron mobility transistor is applied in a half-bridge circuit.
根據本揭露的一實施例,提供一種半導體裝置,包括基底、絕緣層、半導體層、化合物半導體疊層、第一電晶體、第二電晶體、隔離結構以及導電結構。絕緣層、半導體層和化合物半導體疊層,依序設置於基底上,第一電晶體位於第一元件區內,且包括第一閘極、第一源極和第一汲極設置於化合物半導體疊層上,第二電晶體位於第二元件區內,且包括第二閘極、第二源極和第二汲極設置於化合物半導體疊層上,隔離結構設置於第一電晶體和第二電晶體之間,導電結構位於第二元件區內,貫穿化合物半導體疊層,且電連接半導體層至第二源極,其中位於第一元件區內的半導體層與第一源極之間不具有電性連接。According to an embodiment of the present disclosure, a semiconductor device is provided, including a substrate, an insulating layer, a semiconductor layer, a compound semiconductor stack, a first transistor, a second transistor, an isolation structure, and a conductive structure. The insulating layer, the semiconductor layer and the compound semiconductor stack are sequentially arranged on the substrate, the first transistor is located in the first element region, and includes a first gate, a first source and a first drain arranged on the compound semiconductor stack layer, the second transistor is located in the second element region, and includes a second gate, a second source, and a second drain disposed on the compound semiconductor stack, and an isolation structure is disposed between the first transistor and the second transistor Between the crystals, the conductive structure is located in the second element region, runs through the compound semiconductor stack, and electrically connects the semiconductor layer to the second source, wherein there is no electrical connection between the semiconductor layer in the first element region and the first source. sexual connection.
為了讓本揭露之特徵明顯易懂,下文特舉出實施例,並配合所附圖式,作詳細說明如下。In order to make the features of the present disclosure more comprehensible, the following specifically cites the embodiments, together with the accompanying drawings, for a detailed description as follows.
本揭露提供了數個不同的實施例,可用於實現本揭露的不同特徵。為簡化說明起見,本揭露也同時描述了特定構件與佈置的範例。提供這些實施例的目的僅在於示意,而非予以任何限制。舉例而言,下文中針對「第一特徵形成在第二特徵上或上方」的敘述,其可以是指「第一特徵與第二特徵直接接觸」,也可以是指「第一特徵與第二特徵間另存在有其他特徵」,致使第一特徵與第二特徵並不直接接觸。此外,本揭露中的各種實施例可能使用重複的參考符號和/或文字註記。使用這些重複的參考符號與註記是為了使敘述更簡潔和明確,而非用以指示不同的實施例及/或配置之間的關聯性。The present disclosure provides several different embodiments, which can be used to realize different features of the present disclosure. For simplicity of illustration, the present disclosure also describes examples of certain components and arrangements. These examples are provided for the purpose of illustration only, without any limitation. For example, the following description of "the first feature is formed on or over the second feature" may refer to "the first feature is in direct contact with the second feature" or "the first feature is in direct contact with the second feature". There are other features between the features", so that the first feature is not in direct contact with the second feature. In addition, various embodiments in the present disclosure may use repeated reference characters and/or textual notations. The use of these repeated reference signs and notations is to make the description more concise and clear, but not to indicate the relationship between different embodiments and/or configurations.
另外,針對本揭露中所提及的空間相關的敘述詞彙,例如:「在...之下」,「低」,「下」,「上方」,「之上」,「上」,「頂」,「底」和類似詞彙時,為便於敘述,其用法均在於描述圖式中一個元件或特徵與另一個(或多個)元件或特徵的相對關係。除了圖式中所顯示的擺向外,這些空間相關詞彙也用來描述半導體裝置在使用中以及操作時的可能擺向。隨著半導體裝置的擺向的不同(旋轉90度或其它方位),用以描述其擺向的空間相關敘述亦應透過類似的方式予以解釋。In addition, for the space-related narrative vocabulary mentioned in this disclosure, for example: "below", "low", "below", "above", "above", "on", "top "," "bottom" and similar words, for the convenience of description, are used to describe the relative relationship between one element or feature and another (or more) elements or features in the drawing. In addition to the orientations shown in the drawings, these space-related terms are also used to describe possible orientations of semiconductor devices during use and operation. Depending on the orientation of the semiconductor device (rotated by 90 degrees or other orientations), the spatially relative descriptions used to describe its orientation should be interpreted in a similar manner.
雖然本揭露使用第一、第二、第三等等用詞,以敘述種種元件、部件、區域、層、及/或區塊(section),但應了解此等元件、部件、區域、層、及/或區塊不應被此等用詞所限制。此等用詞僅是用以區分某一元件、部件、區域、層、及/或區塊與另一個元件、部件、區域、層、及/或區塊,其本身並不意含及代表該元件有任何之前的序數,也不代表某一元件與另一元件的排列順序、或是製造方法上的順序。因此,在不背離本揭露之具體實施例之範疇下,下列所討論之第一元件、部件、區域、層、或區塊亦可以第二元件、部件、區域、層、或區塊之詞稱之。Although the present disclosure uses terms such as first, second, third, etc. to describe various elements, components, regions, layers, and/or sections, it should be understood that these elements, components, regions, layers, and/or blocks should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, and/or block from another element, component, region, layer, and/or block, and do not imply or represent the element The presence of any preceding ordinal number does not imply an order of arrangement of one element over another, or an order in method of manufacture. Therefore, without departing from the scope of the specific embodiments of the present disclosure, the first element, component, region, layer, or block discussed below may also be referred to as the second element, component, region, layer, or block Of.
本揭露中所提及的「約」或「實質上」之用語通常表示在一給定值或範圍的20%之內,較佳是10%之內,且更佳是5%之內,或3%之內,或2%之內,或1%之內,或0.5%之內。應注意的是,說明書中所提供的數量為大約的數量,亦即在沒有特定說明「約」或「實質上」的情況下,仍可隱含「約」或「實質上」之含義。The terms "about" or "substantially" mentioned in this disclosure usually mean within 20%, preferably within 10%, and more preferably within 5%, of a given value or range Within 3%, or within 2%, or within 1%, or within 0.5%. It should be noted that the quantities provided in the description are approximate quantities, that is, the meaning of "about" or "substantial" may still be implied if "about" or "substantial" is not specified.
本揭露中所提及的「耦接」、「耦合」、「電連接」一詞包含任何直接及間接的電氣連接手段。舉例而言,若文中描述第一部件耦接於第二部件,則代表第一部件可直接電氣連接於第二部件,或透過其他裝置或連接手段間接地電氣連接至該第二部件。The words "coupling", "coupling" and "electrical connection" mentioned in this disclosure include any direct and indirect electrical connection means. For example, if it is described that a first component is coupled to a second component, it means that the first component may be directly electrically connected to the second component, or indirectly electrically connected to the second component through other devices or connection means.
在本揭露中,「三五族半導體(group III-V semiconductor)」係指包含至少一第三族(group III)元素與至少一第五族(group V)元素的化合物半導體。其中,第三族元素可以是硼(B)、鋁(Al)、鎵(Ga)或銦(In),而第五族元素可以是氮(N)、磷(P)、砷(As)或銻(Sb)。進一步而言,「三五族半導體」可以是二元化合物半導體、三元化合物半導體或四元化合物半導體,包括:氮化鎵(GaN)、磷化銦(InP)、砷化鋁(AlAs)、砷化鎵(GaAs)、氮化鋁鎵(AlGaN)、氮化銦鋁鎵(InAlGaN)、氮化銦鎵(InGaN)、氮化鋁(AlN)、磷化鎵銦(GaInP)、砷化鋁鎵(AlGaAs)、砷化鋁銦(InAlAs)、砷化鎵銦(InGaAs)、氮化鋁(AlN)、磷化鎵銦(GaInP)、砷化鋁鎵(AlGaAs)、砷化鋁銦(InAlAs)、砷化鎵銦(InGaAs)、其類似物或上述化合物的組合,但不限於此。此外,端視需求,三五族半導體內亦可包括摻質,而為具有特定導電型的三五族半導體,例如n型或p型三五族半導體。在下文中,三五族半導體又可稱為III-V族半導體。In this disclosure, "group III-V semiconductor" refers to a compound semiconductor including at least one group III element and at least one group V element. Among them, the third group element can be boron (B), aluminum (Al), gallium (Ga) or indium (In), and the fifth group element can be nitrogen (N), phosphorus (P), arsenic (As) or Antimony (Sb). Further, "three and five group semiconductors" can be binary compound semiconductors, ternary compound semiconductors or quaternary compound semiconductors, including: gallium nitride (GaN), indium phosphide (InP), aluminum arsenide (AlAs), Gallium Arsenide (GaAs), Aluminum Gallium Nitride (AlGaN), Indium Aluminum Gallium Nitride (InAlGaN), Indium Gallium Nitride (InGaN), Aluminum Nitride (AlN), Gallium Indium Phosphide (GaInP), Aluminum Arsenide Gallium (AlGaAs), Aluminum Indium Arsenide (InAlAs), Aluminum Indium Arsenide (InGaAs), Aluminum Nitride (AlN), Gallium Indium Phosphide (GaInP), Aluminum Gallium Arsenide (AlGaAs), Aluminum Indium Arsenide (InAlAs) ), indium gallium arsenide (InGaAs), its analogs, or a combination of the above compounds, but not limited thereto. In addition, depending on the requirements, dopants may also be included in the III-V semiconductor, and it is a III-V semiconductor with a specific conductivity type, such as an n-type or a p-type III-V semiconductor. Hereinafter, III-V semiconductors may also be referred to as III-V semiconductors.
雖然下文係藉由具體實施例以描述本揭露的發明,然而本揭露的發明原理亦可應用至其他的實施例。此外,為了不致使本發明之精神晦澀難懂,特定的細節會被予以省略,該些被省略的細節係屬於所屬技術領域中具有通常知識者的知識範圍。Although the invention disclosed in the present disclosure is described below through specific embodiments, the principles of the invention disclosed in the present disclosure can also be applied to other embodiments. In addition, in order not to obscure the spirit of the present invention, certain details will be omitted, and these omitted details belong to the knowledge scope of those having ordinary skill in the art.
本揭露係關於包含高電子遷移率電晶體(HEMT)的半導體裝置,HEMT可作為半橋電路的高壓(high voltage)開關元件(或稱為上橋開關元件)和低壓(low voltage)開關元件(或稱為下橋開關元件),根據本揭露之實施例,作為上橋開關元件的HEMT的背極與源極之間不會有電性連接,而是將上橋開關元件的HEMT的背極電連接至接地端,或者讓上橋開關元件的HEMT的背極為電浮置層(electrically floating layer),如此可以讓上橋開關元件的背極與半導體裝置的基底之間不會有寄生電容產生,進而避免半導體裝置的輸入/輸出電壓受到影響,以及避免半導體裝置的背極與基底之間的厚度對裝置供電電壓(Vbus)的能力造成限制。The present disclosure relates to a semiconductor device including a high electron mobility transistor (HEMT), which can be used as a high voltage (high voltage) switching element (or called a high voltage switching element) and a low voltage (low voltage) switching element ( or called the lower bridge switching element), according to the embodiment of the present disclosure, there is no electrical connection between the back pole and the source of the HEMT as the upper bridge switching element, but the back pole of the HEMT of the upper bridge switching element Electrically connected to the ground terminal, or make the back of the HEMT of the high-side switching element an electrically floating layer (electrically floating layer), so that there will be no parasitic capacitance between the back of the high-side switching element and the substrate of the semiconductor device , thereby preventing the input/output voltage of the semiconductor device from being affected, and preventing the thickness between the back electrode and the substrate of the semiconductor device from limiting the capability of the device supply voltage (Vbus).
第1圖是根據本揭露一實施例所繪示的半導體裝置的剖面示意圖。如第1圖所示,在一實施例中,半導體裝置100包含由下至上依序設置的基底101、絕緣層103、半導體層105和化合物半導體疊層110。根據一些實施例,基底101的材料可包含陶瓷、碳化矽(SiC)、氮化鋁(AlN)、藍寶石(sapphire)或矽。當基底101為高硬度、高導熱性、及低導電性的材質時,例如陶瓷基底,則更適用於高壓半導體裝置。其中,上述的高硬度、高導熱性、及低導電性係相較於單晶矽基底而言,且高壓半導體裝置係指操作電壓高於50V的半導體裝置。絕緣層103的材料可包含氧化矽、氮化矽、氮氧化矽或前述之組合,半導體層105的材料可包含矽或多晶矽。在一實施例中,基底101例如是矽,絕緣層103例如是氧化矽,半導體層105例如是矽,並且基底101、絕緣層103和半導體層105構成絕緣層上覆半導體(semiconductor on insulator,SOI)基底,亦即本揭露一實施例之基底101、絕緣層103和半導體層105可由SOI基底提供。在另一實施例中,基底101、絕緣層103和半導體層105可由核心基材被複合材料層包裹所構成的複合基底(又稱為QST基板)提供,其中核心基材包含陶瓷、碳化矽、氮化鋁、藍寶石或矽,複合材料層包含絕緣材料層和半導體材料層,絕緣材料層可以是單層或多層的氧化矽、氮化矽或氮氧化矽,半導體材料層可以是矽或多晶矽,並且在半導體裝置的製作過程中,位於核心基材背面的複合材料層會經過減薄製程而被移除,例如經由研磨或蝕刻製程,使得核心基材的背面被暴露出。在一些實施例中,絕緣層103的厚度範圍可約為1微米(µm)至3微米(µm),例如約2微米(µm),半導體層105的厚度範圍可約為5奈米(nm)至350奈米(nm),半導體層105的厚度可以被適度的調整,使其不會產生破裂。在一些實施例中,基底101為絕緣基底,其材料包含陶瓷、氮化鋁或藍寶石。在另一些實施例中,基底101電連接至接地端。FIG. 1 is a schematic cross-sectional view of a semiconductor device according to an embodiment of the disclosure. As shown in FIG. 1 , in one embodiment, the
根據本揭露之實施例,化合物半導體疊層110設置於半導體層105上,以形成高電子遷移率電晶體。可經由磊晶成長方式在半導體層105上形成化合物半導體疊層110,半導體層105可作為化合物半導體疊層110的晶種層(nucleation layer)。根據一些實施例,化合物半導體疊層110可包含緩衝層(buffer layer)106、高電阻層(high resistance layer)(或稱為電隔離層)107、通道層(channel layer)108及阻障層(barrier layer)109,由下至上依序堆疊於半導體層105上,且化合物半導體疊層110的各層材料包含三五族化合物半導體(又稱為III-V族半導體)。在一實施例中,緩衝層106可以是超晶格(superlattice, SL)結構,例如包含複數層交替堆疊的氮化鋁鎵(AlGaN)層和氮化鋁(AlN)層,高電阻層107例如是摻雜碳的氮化鎵(c-GaN)層,通道層108例如是未摻雜的氮化鎵(u-GaN)層,阻障層109例如是氮化鋁鎵(AlGaN)層,但不限於此。此外,化合物半導體疊層110亦可進一步包含其他層,例如用於降低晶格缺陷的磊晶層(例如:AlN),該磊晶層可被設置於緩衝層106和半導體層105之間。化合物半導體疊層110的各層組成及結構配置可依據各種半導體裝置的需求而定。According to an embodiment of the present disclosure, the
根據本揭露之實施例,半導體裝置100還包含第一電晶體100-1和第二電晶體100-2,第一電晶體100-1位於第一元件區101-1內,且包含第一閘極G1、第一源極S1和第一汲極D1設置於化合物半導體疊層110上。第二電晶體100-2位於第二元件區101-2內,且包含第二閘極G2、第二源極S2和第二汲極D2設置於化合物半導體疊層110上。此外,第一電晶體100-1還包含第一蓋層111設置於第一閘極G1和阻障層109之間,第二電晶體100-2還包含第二蓋層112設置於第二閘極G2和阻障層109之間。在一實施例中,第一蓋層111和第二蓋層112例如是p型氮化鎵(p-GaN)層,但不限於此。由於通道層108和阻障層109間具有不連續的能隙,藉由將通道層108和阻障層109互相堆疊設置,電子會因壓電效應而被聚集於通道層108和阻障層109之間的異質接面,因而產生高電子遷移率的薄層,亦即二維電子氣區域2DEG。針對常關型(normally off)元件而言,當不施加電壓至第一閘極G1、第二閘極G2時,被第一蓋層111、第二蓋層112所覆蓋的區域不會形成二維電子氣(如第1圖所示),可視為是2DEG截斷區域,此時第一源極S1和第一汲極D1之間、第二源極S2和第二汲極D2之間不會導通。當施加正電壓至第一閘極G1、第二閘極G2時,被第一蓋層111、第二蓋層112所覆蓋的區域會形成二維電子氣,使得第一源極S1和第一汲極D1之間、第二源極S2和第二汲極D2之間產生連續的二維電子氣區域,而讓第一源極S1和第一汲極D1之間、第二源極S2和第二汲極D2之間導通。在本揭露的實施例中,第一電晶體100-1及第二電晶體100-2為高電子遷移率電晶體(HEMT)。According to an embodiment of the present disclosure, the
此外,半導體裝置100還包含隔離結構120設置於第一電晶體100-1和第二電晶體100-2之間。在一些實施例中,隔離結構120貫穿化合物半導體疊層110和半導體層105,並進一步向下延伸至絕緣層103的一深度位置,隔離結構120的底面可低於絕緣層103的頂面。可以經由在化合物半導體疊層110、半導體層105和絕緣層103中蝕刻出深溝槽,在深溝槽內填充介電材料,例如氧化矽、氮化矽或前述之組合,並經過化學機械平坦化(chemical-mechanical planarization, CMP)製程而形成隔離結構120。在一些實施例中,隔離結構120可為一圈或多圈的環狀絕緣柱結構,環繞住第一電晶體100-1及第二電晶體100-2。在本揭露的實施例中,半導體層105可作為第一電晶體100-1及第二電晶體100-2的背極(backside electrode),而貫穿化合物半導體疊層110和半導體層105的隔離結構120可以在第一電晶體100-1和第二電晶體100-2之間提供良好的電性隔離。In addition, the
第2圖是根據本揭露一實施例所繪示的半橋電路130,如第2圖所示,第一電晶體100-1可為半橋電路130的高壓(high voltage)開關元件(或稱為上橋開關元件),第二電晶體100-2可為半橋電路130的低壓(low voltage)開關元件(或稱為下橋開關元件),其中上橋開關元件的第一汲極D1電連接至一輸入電壓節點Vin,下橋開關元件的第二源極S2電連接至接地端GND,上橋開關元件的第一源極S1電連接至下橋開關元件的第二汲極D2,並且還可進一步電連接至一輸出電壓節點(未繪示)。請同時參閱第1圖和第2圖,半導體裝置100還包含導電結構113設置於第二元件區101-2內,導電結構113貫穿第二元件區101-2內的化合物半導體疊層110,並且將第二元件區101-2內的半導體層105電連接至第二源極S2。由於半導體層105可作為第一電晶體100-1的背極B1及第二電晶體100-2的背極B2,因此導電結構113可將第二電晶體100-2(又稱為下橋開關元件)的背極B2電連接至第二源極S2,而下橋開關元件的第二源極S2通常會電連接至接地節點,因此第二電晶體100-2的背極B2可經由導電結構113和第二源極S2而電性接地。FIG. 2 is a half-
此外,根據本揭露之實施例,位於第一元件區101-1內的半導體層105與第一源極S1之間不具有電性連接,亦即第一電晶體100-1(又稱為上橋開關元件)的背極B1不會直接電性連接至第一源極S1,在第一源極S1的垂直投影區域內不具有貫穿化合物半導體疊層110且連接至半導體層105的導電結構。由於上橋開關元件的第一源極S1會透過互連結構117電性連接至下橋開關元件的第二汲極D2,並具有輸出電壓的電位,而本揭露之實施例的第一元件區101-1內的半導體層105不會電性連接至第一源極S1,因此第一元件區101-1內的半導體層105不會具有輸出電壓的電位,進而避免第一元件區101-1內的半導體層105與基底101之間產生寄生電容,藉此可避免半導體裝置100的輸入/輸出電壓受到影響,維持正常的工作電壓。In addition, according to the embodiment of the present disclosure, there is no electrical connection between the
根據本揭露一實施例,請同時參閱第1圖和第2圖,第一元件區101-1內的半導體層105(上橋開關元件的背極B1)可經由設置在第一閘極G1、第一源極S1和第一汲極D1外側的另一導電結構115電連接至接地端,如第2圖所示,在一實施例中,上橋開關元件的背極B1和下橋開關元件的第二源極S2皆電連接至相同的接地節點。如第1圖所示,在一實施例中,另一導電結構115設置在第一閘極G1、第一源極S1和第一汲極D1的垂直投影區域以外的區域中,並且導電結構115貫穿化合物半導體疊層110,電連接至半導體層105,導電結構115可經由設置在其上方的導電墊(conductive pad)116電連接至接地端,進而使得上橋開關元件的背極B1經由導電結構115、導電墊116和其他連接結構電連接至接地端。According to an embodiment of the present disclosure, please refer to FIG. 1 and FIG. 2 at the same time, the
第3圖是根據本揭露一實施例所繪示的半導體裝置的俯視示意圖。如第3圖所示,在一實施例中,第一元件區101-1及/或第二元件區101-2的週邊會被導電性的密封環140所環繞。第一元件區101-1內的導電墊116可經由導線118電連接至設置在半導體裝置100的元件區外圍的密封環(seal ring)140,並經由密封環140電連接至接地端,使得第一元件區101-1內位於導電墊116下方的的導電結構115電連接至接地端,進而讓第一元件區101-1內的半導體層105電性接地。上述的導線118可以被設置於導電墊116上方的介電層(圖未示)中,但不限定於此。雖然第3圖中僅繪出兩個第一元件區101-1和兩個第二元件區101-2被密封環140所圍繞,實際上被密封環140圍繞的元件區可以有更多個,且每個元件區被隔離結構120所圍繞,在一實施例中,各隔離結構120可互相連接形成網狀結構。此外,隔離結構120可以是絕緣柱結構,環繞導電墊116下方的導電結構115,以避免相鄰的第一元件區101-1及第二元件區101-2產生不必要電連接。FIG. 3 is a schematic top view of a semiconductor device according to an embodiment of the disclosure. As shown in FIG. 3 , in one embodiment, the periphery of the first device region 101 - 1 and/or the second device region 101 - 2 is surrounded by a
第4圖是根據本揭露另一實施例所繪示的半導體裝置的剖面示意圖。第4圖的半導體裝置100與第1圖的半導體裝置100的差異在於第一電晶體100-1的第一源極S1和第一汲極D1,以及第二電晶體100-2的第二源極S2和第二汲極D2皆向下延伸貫穿阻障層109到達通道層108的頂面,並且第二元件區101-2內的導電結構113設置在第二源極S2正下方,貫穿全部的通道層108、高電阻層107和緩衝層106,但不貫穿阻障層109。在另一實施例中,第一源極S1、第一汲極D1、第二源極S2和第二汲極D2還可以進一步向下延伸至通道層108的一深度位置,並且與第二源極S2接觸的導電結構113可以貫穿部份的通道層108以及高電阻層107和緩衝層106。FIG. 4 is a schematic cross-sectional view of a semiconductor device according to another embodiment of the disclosure. The difference between the
另外,在第4圖的半導體裝置100中,隔離結構120貫穿化合物半導體疊層110和半導體層105,到達絕緣層103的頂面,亦即隔離結構120的底面與絕緣層103的頂面在同一平面。在一些實施例中,基底101為絕緣基底,其材料包含陶瓷、氮化鋁或藍寶石。在另一些實施例中,基底101電連接至接地端。此外,在第4圖的半導體裝置100中,第一元件區101-1內的半導體層105可為電浮置層,亦即第一元件區101-1內的半導體層105沒有透過第1圖所示的另一導電結構115電連接至接地端,而是讓第一元件區101-1內的半導體層105具有接近0V的浮動電位,由於基底101具有接地電位或者為絕緣基底,因此在第一元件區101-1內的半導體層105與基底101之間不會產生寄生電容。In addition, in the
第5圖是根據本揭露另一實施例所繪示的半導體裝置的剖面示意圖。如第5圖所示,此實施例的半導體裝置200與第1圖和第4圖的半導體裝置100的差異在於,作為上橋開關元件的第一電晶體200-1之第一源極S1與第一元件區101-1內的半導體層105之間經由導電結構113電性連接。第6圖是根據本揭露另一實施例所繪示的半橋電路230,請同時參閱第5圖和第6圖,由於此實施例之半導體裝置200的第一元件區101-1內的半導體層105,亦即第一電晶體200-1的背極B1電連接至第一源極S1,而第一源極S1電連接至第二汲極D2,且還進一步電連接至輸出電壓的節點(未繪出),因此,此實施例之半導體裝置200的第一元件區101-1內的半導體層105會具有0V至輸出電壓的浮動電位,導致半導體裝置200的第一元件區101-1內的半導體層105與基底101之間產生寄生電容Cox,影響半導體裝置200的輸入/輸出電壓,造成電源無法維持正常的工作電壓。FIG. 5 is a schematic cross-sectional view of a semiconductor device according to another embodiment of the disclosure. As shown in FIG. 5, the difference between the
此外,此實施例之半導體裝置200的寄生電容Cox會受到絕緣層103的厚度影響,若要降低寄生電容Cox,必須增加半導體裝置200的絕緣層103的厚度,然而,當絕緣層103的厚度越厚,半導體裝置200的散熱能力也會變差,導致半導體裝置200的效能下降。In addition, the parasitic capacitance Cox of the
相較之下,針對第1圖至第4圖所例示之半導體裝置100,由於本揭露之實施例的半導體裝置100的第一元件區101-1內的半導體層105,亦即上橋開關元件的第一電晶體100-1之背極B1電連接至接地節點,或者為具有接近0V電位的電浮置層,因此在第一元件區101-1內的半導體層105與基底101之間不會有寄生電容產生,絕緣層103的厚度不會受到限制,亦即絕緣層103的厚度可以比較薄,以維持半導體裝置100的散熱能力。另外,根據本揭露的一些實施例,基底101為電絕緣且導熱的基底,例如由高度絕緣且高導熱的氮化鋁(AlN)製成,其導熱性高於絕緣層103的導熱性。此時,基底101不僅可以增加半導體裝置100的散熱能力,也可以增加構成寄生電容的整體絕緣的厚度(亦即為絕緣層103的厚度加上基底101的厚度),進而大幅地降低寄生電容,大致上可消除寄生電容而忽略不計,如此可以避免半導體裝置100的背極下方的絕緣層厚度(垂直方向厚度)對裝置供電電壓(Vbus)的限制。In contrast, for the
因此,本揭露之實施例的半導體裝置可以使用高電子遷移率電晶體作為半橋電路的上橋開關元件和下橋開關元件,達到系統單晶片(SoC)的好處,避免上下橋開關元件之間因打線造成的寄生電感與電容效應,同時還能消除上橋開關元件的背極與基底之間的寄生電容,避免背極下方的絕緣層厚度對裝置的供電電壓(Vbus)的限制,以維持半導體裝置的散熱功能,進而提昇半導體裝置的效能。 以上所述僅為本發明之較佳實施例,凡依本發明申請專利範圍所做之均等變化與修飾,皆應屬本發明之涵蓋範圍。 Therefore, the semiconductor device of the embodiment of the present disclosure can use high electron mobility transistors as the upper-bridge switching element and the lower-bridge switching element of the half-bridge circuit, so as to achieve the benefits of a system on a chip (SoC) and avoid the gap between the upper and lower bridge switching elements. The parasitic inductance and capacitance effects caused by wire bonding can also eliminate the parasitic capacitance between the back electrode and the substrate of the upper bridge switching element, avoiding the limitation of the thickness of the insulating layer under the back electrode on the power supply voltage (Vbus) of the device to maintain The heat dissipation function of the semiconductor device improves the efficiency of the semiconductor device. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.
100:半導體裝置 100-1:第一電晶體 100-2:第一電晶體 101:基底 101-1:第一元件區 101-2:第二元件區 103:絕緣層 105:半導體層 106:緩衝層 107:高電阻層 108:通道層 109:阻障層 110:化合物半導體疊層 111:第一蓋層 112:第二蓋層 113:導電結構 115:導電結構 116:導電墊 117:互連結構 118:導線 120:隔離結構 130:半橋電路 140:密封環 200:半導體裝置 200-1:第一電晶體 200-2:第一電晶體 230:半橋電路 G1:第一閘極 G2:第二閘極 S1:第一源極 S2:第二源極 D1:第一汲極 D2:第二汲極 2DEG:二維電子氣區域 B1、B2:背極 Vin:輸入電壓節點 GND:接地端 Cox:寄生電容100: Semiconductor device 100-1: The first transistor 100-2: The first transistor 101: Base 101-1: The first component area 101-2: Second component area 103: insulation layer 105: Semiconductor layer 106: buffer layer 107: High resistance layer 108: Channel layer 109: Barrier layer 110:Compound semiconductor stack 111: The first cover layer 112: Second cover layer 113: Conductive structure 115: Conductive structure 116: Conductive pad 117:Interconnect structure 118: wire 120: Isolation structure 130: Half bridge circuit 140: sealing ring 200: Semiconductor device 200-1: The first transistor 200-2: The first transistor 230: Half bridge circuit G1: the first gate G2: the second gate S1: first source S2: second source D1: the first drain D2: the second drain 2DEG: two-dimensional electron gas region B1, B2: back pole Vin: input voltage node GND: ground terminal Cox: parasitic capacitance
為了使下文更容易被理解,在閱讀本揭露時可同時參考圖式及其詳細文字說明。透過本文中之具體實施例並參考相對應的圖式,俾以詳細解說本揭露之具體實施例,並用以闡述本揭露之具體實施例之作用原理。此外,為了清楚起見,圖式中的各特徵可能未按照實際的比例繪製,因此某些圖式中的部分特徵的尺寸可能被刻意放大或縮小。 第1圖是根據本揭露一實施例所繪示的半導體裝置的剖面示意圖。 第2圖是根據本揭露一實施例所繪示的半橋電路。 第3圖是根據本揭露一實施例所繪示的半導體裝置的俯視示意圖。 第4圖是根據本揭露另一實施例所繪示的半導體裝置的剖面示意圖。 第5圖是根據本揭露又另一實施例所繪示的半導體裝置的剖面示意圖。 第6圖是根據本揭露另一實施例所繪示的半橋電路。 In order to make the following easier to understand, you can refer to the drawings and their detailed descriptions at the same time when reading this disclosure. Through the specific embodiments herein and referring to the corresponding drawings, the specific embodiments of the present disclosure are explained in detail, and the working principle of the specific embodiments of the present disclosure is explained. In addition, for the sake of clarity, the various features in the drawings may not be drawn according to the actual scale, so the size of some features in some drawings may be intentionally enlarged or reduced. FIG. 1 is a schematic cross-sectional view of a semiconductor device according to an embodiment of the disclosure. FIG. 2 is a half-bridge circuit according to an embodiment of the disclosure. FIG. 3 is a schematic top view of a semiconductor device according to an embodiment of the disclosure. FIG. 4 is a schematic cross-sectional view of a semiconductor device according to another embodiment of the disclosure. FIG. 5 is a schematic cross-sectional view of a semiconductor device according to yet another embodiment of the disclosure. FIG. 6 is a half-bridge circuit according to another embodiment of the disclosure.
100:半導體裝置 100: Semiconductor device
100-1:第一電晶體 100-1: The first transistor
100-2:第一電晶體 100-2: The first transistor
101:基底 101: Base
101-1:第一元件區 101-1: The first component area
101-2:第二元件區 101-2: Second component area
103:絕緣層 103: insulation layer
105:半導體層 105: Semiconductor layer
106:緩衝層 106: buffer layer
107:高電阻層 107: High resistance layer
108:通道層 108: Channel layer
109:阻障層 109: Barrier layer
110:化合物半導體疊層 110:Compound semiconductor stack
111:第一蓋層 111: The first cover layer
112:第二蓋層 112: Second cover layer
113:導電結構 113: Conductive structure
115:導電結構 115: Conductive structure
116:導電墊 116: Conductive pad
117:互連結構 117:Interconnect structure
120:隔離結構 120: Isolation structure
G1:第一閘極 G1: the first gate
G2:第二閘極 G2: the second gate
S1:第一源極 S1: first source
S2:第二源極 S2: second source
D1:第一汲極 D1: the first drain
D2:第二汲極 D2: the second drain
2DEG:二維電子氣區域 2DEG: two-dimensional electron gas region
Claims (20)
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EP2824700A1 (en) * | 2013-07-12 | 2015-01-14 | International Rectifier Corporation | Monolithic composite iii-nitride transistor with high voltage group iv enable switch |
US20200203345A1 (en) * | 2017-09-06 | 2020-06-25 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and method for manufacturing semiconductor device |
TWI718330B (en) * | 2016-08-24 | 2021-02-11 | 日商半導體能源硏究所股份有限公司 | Semiconductor device and manufacturing method thereof |
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EP2824700A1 (en) * | 2013-07-12 | 2015-01-14 | International Rectifier Corporation | Monolithic composite iii-nitride transistor with high voltage group iv enable switch |
TWI718330B (en) * | 2016-08-24 | 2021-02-11 | 日商半導體能源硏究所股份有限公司 | Semiconductor device and manufacturing method thereof |
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