TWI225714B - Electrode structure for a light-emitting device - Google Patents

Abstract

An electrode structure for a light-emitting device includes a first electrode and a second electrode. The first electrode has a plurality of first fingers paralleling with each other, a first connective element, and at least a first contact element. Each first finger has a first end and a second end. A plurality of first ends connect to the first connective element. The first contact element interposes between any first end and the first connective element. The second electrode has a plurality of second fingers paralleling with each other, a second connective element, and at least a second contact element. Each second finger has a third end and a fourth end, and any second finger is between and parallels to any two first fingers. A plurality of third ends connect to the second connective element. The second contact element interposes between any third end and the second connective element. The second electrode defines a plurality of hexagonal units among a plurality of second ends. Each hexagonal unit shares its four sides to its adjacent hexagonal units, and the four sides include two of the second fingers and the second connective element. Each second end extends to the center of each hexagonal unit.

Description

1225714 Case No. 921344RQ V. Description of the invention (1) 1. [Technical field to which the invention belongs] The present invention: Electricity related to the photovoltaic element-a kind of electricity of the photovoltaic element formed with a hexagonal structure :: Yes About II. [Previous technology] Because gallium nitride (GaN) has a wide band gap (at a 3 · 4eV) and its light emission range is in the blue light wave, Eg at temperature-cooperation as a material for short-wavelength light-emitting elements , 丄 ::: Gallium carbide is very suitable for silver and metals. After continuous research and development, the basic technology can be stabilized, and the gallium lice can grow sapphire sapphire (sapphire) system steadily, and if appropriate epitaxial and electrode arrangements, you can make short-wavelength light emission element. As shown in the first figure, 'is a schematic plan view of an electrode of a conventional light-emitting element. The first electrode 11 〇 When a voltage is applied, a current flows into the light-emitting element through a contact pad connected to the first electrode 11, and energy is generated by recombination of minority carriers caused by passing through the internal P / N junction in a forward direction. After the light is emitted, the current will converge to the second electrode 120 through different paths (for example, the current paths 11 2, 11 and 116, etc.), and flow out of the light emitting element through the contact pad connected to the second electrode 120. However, the paths from which the current flows from the first electrode 110 to the second electrode 12 are not all equidistant current paths, which also causes a phenomenon of non-uniform current distribution and causes uneven brightness of the light-emitting element. . For example: the current density of the edge current path from 11 2 and 11 6 is longer than the center current path due to the longer path distance.

Page 6 1225714-Case No. 92134469 __Year Month Day Amendment ___ V. Description of the invention (2) The current density of the diameter 1 1 4 is low, so the luminous immunity of the light emitting element at its edge portion is not as good as that of its center portion. Luminous brightness. In addition, uneven current density distribution is also one of the main reasons for the poor reliability of light emitting devices. In order to improve the luminous brightness of light-emitting elements, gallium nitride (GaN) light-emitting elements have gradually shifted to the development of high-power and large-area elements. As shown in the second figure, it is the outline of another finger-type electrode common in high-power semiconductor elements. Top view of structure. The first electrode 150 is perpendicularly connected to the extending electrodes 150 and 1 which are parallel to each other to form a so-called finger electrode structure. The second electrode 160 is also vertically connected to the extending electrodes 16-1, ι-a and = which are parallel to each other to form another finger electrode structure. Because the two-finger electrode is formed as a parallel electrode structure, each extension electrode and the adjacent extension = = the distance is ㈣ ', so' the current flow from the extension electrode to the adjacent extension electric part is an equal distance current path ' Each extension in the average light-emitting element:?: Density and luminous intensity. However, the above-mentioned finger-like structure will change as the distance from the electrode increases, for example: point B to brother-electrode! 50 impedance is greater than point A to ^ This means the intensity of the current flowing to point B It will be better than gold flowing to eight o'clock = ^. Therefore, the current density near the extension electrode B is also small, 々 丨 L, and small. ^ T ^ · Jtt Γ-! The luminous intensity is also weak near the electric muscle. The 4-pair ratio Δ point is attached to the above-mentioned limitation of the light-emitting element electrode structure during production, and there is a need for continuous development.

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Missing items in the previous art. Therefore, how to equidistant the current path between the two electrodes, how to average the distance impedance between the electrode and the extension electrode, and how to use the standard process to meet the different needs of high-power light-emitting elements, the technical field of the second and second technology will inevitably encounter The problem is also the amendment to be solved by the present invention. [Summary of the Invention] In the above-mentioned background of the invention, the pole structure in the art will have electric power of ^^^, which uses six sides to open ;; :: and distance impedance Different issues. The shape of the frame is the geometric characteristics of the plane. It provides a variety of techniques: disadvantages. The electrode structure of the element is used to improve the conventional electrode structure. The purpose of the present invention is to make the electrode structure, and the χ # a edge is the distance of the structure. Another purpose of the structure is to make the flow path from the first electrode to the second electrode Α μ ^ Mao Ming by using an electrode structure with hexagonal A π & Impedance of the distance between the electrode and the extension electrode. The concept of the door, the average cabinet According to the purpose described above, the present-electrode structure 'includes: a first electrode, ... electrode: the

The contact part eight is a Deng Wei, a first connecting part and at least the knife ~ the first finger part has a first end and-

1225714 on page 8 means that one end of the first connection portion and the first connection include a plurality of at least one second to one fourth end, the shape portion, the contact portion is inserted between the second electrode set, each six, Every two second fingers have four co-edges, with the edges extending to the geometric center of each hexagonal cell

i. No. 921344BQ 5. In the description of the invention (4), these first ends are connected to any of the second electrodes, and the second electrode, the first connection part and the part has a third end connected to any adjacent electrode. Two first fingers are connected between two connecting parts, and the second connecting part is between the two. Wherein the above-mentioned plural other hexagonal elements at the second end are close to each other = to form a hexagon of each hexagonal element s-the other two repairs of the early ―-the first contact part is inserted (between the parts; and the first parallel Touch the second finger part of each, any second finger part of each second finger position and these third ends are connected to the first third end and the second connection meaning a plurality of hexagonal units in The polygonal unit has four common edges and shaped portions and a second connecting portion, and each second end is composed of every six L.] A detailed description of ΐΐΓ 月白 士 勺 —Some embodiments will be described in detail below. However, in addition to the detailed text The scope of the invention can also be implemented in other embodiments in general, and the rails are not limited by the party, which is subject to the scope of the subsequent patents. Indications = Clearer description and easier to understand Month, the ratio of the scales of the picture: ΐ Γ draws some dimensions according to its relative size and draws them, and the two have been exaggerated; the irrelevant details are not complete. Seek the simplicity of the illustration.

1225714 92134469 V. Description of the invention (5) Month Θ Correction-Electricity provided an electrode structure of a photovoltaic element, including ...- th-point, 1M-, an electrode including a plurality of first fingers in parallel with each other The connection part and the at least one first connection are always eight, Yiyi potential Lb. The :: and a second end, where-: connected: "-end and the connection; part insertion (interPosion) in any-the first includes the complex ;;;: 二;:; "; = Second electrode, this second electrode has at least one second contact portion, like second, -second connection portion and -fourth end, any one of the first f / "分 有-between the third end and the shaped part, and these ί = part is located between any two first finger touch parts inserted in any-the third; ::: connected to the second connection part, the second connection The second thunder W — while the brother one is connected between the parts. Among the above, each: edge: ^ /, the edge unit is adjacent to the plurality of second end neighbors above, and every two fourth === the fourth hexagon unit has four coedges, and each —Section: 2f The knife constitutes a single side of each-hexagon extending to each—hexagon d:;: The other two configurations of the hexagonal unit are electrode junctions of a preferred embodiment of the present invention, and at least one -In between. In the example of the bottom part of the H-shaped part and the-connecting part, the two-contact parts of the rectangle are page 10 1225714

Insert the bottom end of the first finger-shaped portion 3 and the contact pad separately at intervals. It should be emphasized here that the first contact portion that makes the metal contact is not limited to the rectangular geometric embodiment. In other geometric shapes. " It may also be that the second electrode includes a plurality of second ones parallel to each other and connected to the bottom end of these second finger portions 34. Cent 340, and at least one second contact portion 36. Among them, the J-connecting portion 350 is interspersed in parallel with any first finger at the top of 34 °; the second contact portion is, and the second contact portion 3 60 can be inserted between any of the first ^ 310 and the first Er Lian Zheng neighbors eight πη howl + Xunhe-between the bottom end of the sun-like portion 340 and the total. In this embodiment, the two circles of the circle are respectively located at the bottom of the second finger portion 34 on both sides and are spotted, and the ::: 妾 section 3 50 are connected to form a metal contact pad. In the same way, the contact part is not limited to the geometric shape of a circle but replaced by another geometric shape. Eight force J Μ 380 is here first Yu Zhuang but a number of hexagonal units 37〇, 4th each.卩 / 刀 31 〇 Between the top, as shown in the third B picture. :: Hexagonal units 370, 380 with four common edges (for example: two adjacent and second finger portions 34G and connecting the two second finger portions 34. Hi λ 7 * connecting portion 350) with the other six The edge units 370 and 380 are close to each other, and = 1 adjacent second finger portions 340 in the same direction may also be co-edges with the four contacting portions of the first contact example 1 six sides 1 unit 370, 380. In the real mother's first and fourth, the four common sides of the edge unit 3 7 0 include 0 ~ a second connection 1225714 ___ ^ month day article five, the description of the invention (7) '' " " " 36 0; and the four common sides of each hexagonal unit 38 0 include a second contact portion 360. In addition, the top of each first finger-shaped portion 31 ° extends from the other two sides of each corresponding hexagonal unit 370, 380 to the geometry of each corresponding hexagonal unit 3 7 0, 3 8 0 center. In other words, the above-mentioned finger parts, connection parts, and contact parts are all arranged on the basis of continuous hexagons. Please refer to the third figure B again. The plurality of vertices connected to the plurality of hexagonal cells 37 and 38 are used as the bottom ends of the plurality of second finger portions 34 and are used as any two adjacent hexagons. The co-edge of single t37o and the co-edge of any two adjacent hexagonal cells 38o form a plurality of second finger portions 34o, but only the second finger-shaped portion 34 co-edges of the hexagonal unit jo. , Whose direction is opposite to that of the second finger-shaped portion 34 of the co-edge of the hexagonal single: 38 0. Then, the common sides of the hexagonal cells 37 and 38, which are connected to the bottom end of the third point 340, form 340—Λ then Λ point 3 50. The first finger portion 3 1 0 is located at the opposite vertex of the hexagonal unit 370 where the second finger portion 0 is located. The first and second Λ contact portions 36G may be selected at the apex of the hexagonal unit m. In addition, the 指 _ finger-shaped sheets form the same size between each other: the edge points are formed, but the square is 6 you; the fish bite ❿ Early Fan's diagonal top 310 is opposite to the first on the hexagonal unit 370 The finger-shaped part is finally placed on a plurality of hexagons q, >% ~ As early as 70 7 0 and 3 8 0 in the form of a loyalty to the taxi, every two adjacent and in the same direction?的 成-千千 '^ Brother Yicai said that there is one and 1225714 between the points 3 and 0. Case No. 92134469 V. Description of the invention (8) $ parallel first finger portion 310, in other words, each There is also a second finger-shaped knife 340 parallel to the two adjacent first-shaped points 3 10. Since the sides of each side of the hexagonal units 37 and 380 are equal in length and the distance between the first and second finger portions 3 1 0 and the second finger portion 3 40 is approximately equal, the first A contact portion 33 ° and a second connection point 360 are inserted at the vertices of the hexagonal cells 370 and 38 °, so that the current paths between the two pairs are approximately equidistant, and the average distance between the electrode and the extended electrode = impedance. ❿The above-mentioned appropriate layout is based on the consideration of current dispersion and other factors. For example, ^: General bonding wire: It is smaller than the high-power light-emitting element in the specification of = current. Γ 2 1 is increased by contact. Partially disperses the current with the wire method ::: The flow is too large and burns out; however, too much contact will cause the light emitted by the vulture to be blocked and cause the luminous efficiency of the light emitting element :: low ... based on the above two factors It is appropriate to take into consideration: ί: ί 'ΐ Its: The number of contact parts is not limited. The number of parts that must be symmetrical to each other can be more than the number of the second contact part, or less than the number of the second contact part. Number. [As in the preferred embodiment described in / synthesis, the emphasis of the present invention is on the light-emitting element _ ° · \ first diode (Ught Emitting Diode; LED)) The distance between the two electrical points is equal: the use of six sides Responsibility-adjacent top production ..., X "" Because of 1225714 case number 92134469 between the two improved electrodes and extension electrodes Λ_η Amendment V. Description of the invention (9) The geometric patterns of the symmetric polygons make the entire wafer plane the most effective area Use to improve the area utilization problem of the light-emitting element due to the asymmetric electrode structure. In other words, the hexagonal electrode structure can meet the requirements of the above conditions under the consideration of the average current density and luminous intensity in a small unit of the light-emitting element and the utilization of a large-sized wafer area, which is also the spirit of the present invention. The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of patent application of the present invention; all other equivalent changes or modifications made without departing from the spirit disclosed by the present invention shall be included in the following The scope of patent application.

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V. [Schematic explanation] The first diagram is a schematic plan view of the structure of an electrode of a conventional light-emitting element: the second diagram is a third diagram of the conventional structure of a finger-shaped electrode of a conventional light-emitting element; The electrode structure of a preferred light-emitting element according to the present invention is viewed from the third diagram B and the third A diagram plus the hypothetical hexagonal plan view of the main part of the symbol: 11 0, 1 5 0 first electrode 11 2, 1 1 4, 1 1 6 Current path 120, 160 Second electrode 150-1 > 150-2 First electrode extension electrode Second electrode extension electrode 160-1, 160-2, 1600-1310 First finger portion 320 First connection part 3 3 0 First contact part 340 Second finger part 350 Second connection part 360 Second contact part 370, 380 Hexagonal unit m

I Page 15 1225714 _Case No. 92134469_ Year, Month, Day, and Amendment Brief description of drawings A, B A, B

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Claims (1)

No. 1225714 92134469 VI. Patent application scope I. An electrode structure of a photovoltaic element, including a first electrode, the first electrode including a plurality of first finger portions parallel to each other, a first connection portion and at least one first A contact part, each of m :: points has a first end and a second end, wherein the plurality of brothers are connected to the first connection part, and the first contact part is interpolated at any one The first end and the first connection part are a second electrode, and the second electrode includes, t, the second connection part and at least one second contact part, each of the two finger-shaped parts and a second end Pan my Xiao fourth end, where any-the first sun-shaped adjacent knife is located adjacent to any two the first index third end connected to the second connecting part, = ... in any Xi-from t = Female 丨 the first contact part is inserted between the second end of the younger and the second connection part, and wherein the second electrode defines a plurality of six sides and two ends, each-the hexagonal unit with four nc Several of the first early fans, the mother_the four common edges contain each The second connection part, and each Xi- # :: 第 —finger part and the fairy and the mother 5 Haidi one 'from the mother-the hexagonal single 亓 xi 苴 ^ extended to each of the six sides The geometric center of the shape unit. The electrode structure of the photovoltaic element described in item 1 of the 8m patent scope is straight and the two fingers are interspersed with each other in parallel. The electrode structure of the optoelectronic element described in item II of the patent range and item 1 of the patent claims, where the "the number of contact parts mentioned above" includes a plurality of spaced insertions. Page 17 1225714 __Case No. 92134469 Date of Patent Application '~~ 1 ~-The electrode structure between any of the first end and the first connection portion. 4 · The electrode structure of the photovoltaic element according to item 1 of the scope of the patent application, wherein when the second contact portion is plural, it includes a spaced interval between any of the third end and the second connection portion. Electrode structure. Fanri 5 · The electrode structure of the photovoltaic element according to item 1 of the scope of patent application, wherein the four common edges further include an odd number of second contact portions. ^ 6 · The electrode structure of the photovoltaic element according to item 1 of the scope of the patent application, wherein the four common edges further include an even number of second contact portions. 〃 7 · An electrode structure of a light emitting diode, comprising: a first electrode, the first electrode comprising a plurality of first finger portions parallel to each other, a first connection portion and at least one rectangular first contact portion, Each of the first finger portions has a first end and a second end, where ^ several first ends are connected to the first connecting portion, and the rectangular first contact ^ = interposes on any of the first One end is between the first connection part and the knife 'and forms a metal contact pad; and the contact part, the shape part, a second connection part and at least one circular part :; Ξ :: the finger part has a third end And a fourth end, wherein: the second part is located between any two adjacent first finger parts, the second end is connected to the second connection part, and the round second part is connected 1225714 _Case No. 92134469_ Modification of the month of the year_ 6. The scope of the patent application is inserted between any of the third end and the second connection portion, and the second electrode defines a plurality of hexagonal cells in the plurality. Between the second ends, each of the hexagonal units is adjacent to the other hexagonal units with four common edges, and each of the four common edges includes every two of the second finger portions and the second connecting portion. And each of the second ends extends from the other two sides of each of the hexagonal units to the geometric center of each of the hexagonal units. 8. The electrode structure of the light emitting diode according to item 7 in the scope of the patent application, wherein the first parallel finger portions and the second parallel finger portions are interspersed with each other in parallel. 9. The electrode structure of the light-emitting diode according to item 7 in the scope of the patent application, wherein when the rectangular first contact portion is plural, it includes a spaced insertion at any one of the first ends and the first connection. Electrode structure between parts. 10. The electrode structure of the light-emitting diode according to item 7 in the scope of the patent application, wherein when the above-mentioned circular second contact portion is plural, it includes inserting at intervals between any of the third end and the first Electrode structure between two connecting parts. 11. The electrode structure of the light-emitting diode according to item 7 of the scope of the patent application, wherein the four common edges further include an odd number of circular second contact portions. Page 19 1225714 Page 20