Leadframe structure for concentrated photovoltaic receiver package

• US 8,680,656 B1
• Filed: 01/05/2009
• Issued: 03/25/2014
• Est. Priority Date: 01/05/2009
• Status: Active Grant

• Current Assignee: Amkor Technology Singapore Holding Pte., Ltd. (Amkor Technology Incorporated)
• Original Assignee: Amkor Technology Incorporated
• Inventors: Kuo, Bob Shih Wei, Olson, Timothy L., Nickelsen, John Merrill Jr.
• Primary Examiner(s): Sefer, Ahmed
• Application Number:
  US12/348,853
• Time in Patent Office: 1,905 Days
• Field of Search: 257/13, 257 98- 99, 257/666
• US Class Current: 257/666
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48465 the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
• CPC Class Codes: H01L 2224/49175 Parallel arrangements
• CPC Class Codes: H01L 23/49562 for devices being provided for in H01L29/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/1815 Shape
• CPC Class Codes: H01L 31/0508 the interconnection means having a particular shape
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

In accordance with the present invention, there is provided multiple embodiments of a concentrated photovoltaic receiver package or module. In each embodiment of the present invention, the module comprises a leadframe including a first section and a second section disposed in spaced relation to each other. Mounted to the first section of the leadframe is a receiver die. The receiver die is electrically connected to both the first and second sections of the leadframe. In one embodiment of the present invention, the receiver die is electrically connected to the second section of the leadframe by a plurality of conductive wires. In another embodiment of the present invention, the receiver die is electrically connected to the second section of the leadframe by a conductive bonding material. Portions of the leadframe may optionally be covered by a molded body which can be used to define an alignment feature for a light concentrating device such as a light guide or optical rod.

Claims

1. A CPV module, comprising:

a leadframe including a first section and a second section disposed in spaced relation to each other, the first section including a connector portion and a die pad portion that is attached to the connector portion and defines opposed top and bottom surfaces, the second section including a base portion, a connector portion extending from the base portion, and at least two prong portions extending from the base portion in spaced, generally parallel relation to each other, wherein the connector portions of the first and second sections of the leadframe extend in generally co-planar relation to each other along a common first plane, and the die pad portion of the first section extend along a second plane that is disposed in spaced, generally parallel relation to the first plane; and

a receiver die mounted and electrically connected to the first section, and electrically connected to each of the prong portions of the second section by respective ones of at least first and second electrical connectors.

2. The CPV module of claim 1 wherein the first and second electrical connectors each comprise a plurality of conductive wires.

3. The CPV module of claim 2 further comprising a molded body which covers the conductive wires, a portion of the receiver die, and portions of the first and second sections of the leadframe, the body defining a window in which a portion of the receiver die is exposed.

4. The CPV module of claim 3 wherein the window is defined by a surface of the body which is mechanically adapted to facilitate the alignment of a light concentrating device with the portion of the receiver die exposed in the window.

5. The CPV module of claim 3 wherein the receiver die is mounted and electrically connected to the top surface of the die pad portion, with the bottom surface of the die pad portion being exposed in the body.

6. The CPV module of claim 5 wherein the die pad portion includes a recessed shelf extending at least partially thereabout and covered by the body to form a mechanical interlock between the first section of the leadframe and the body.

7. The CPV module of claim 1 wherein a surface of each of the at least two prong portions is attached to the upper surface of the receiver die with a strip of a conductive bonding material.

8. The CPV module of claim 1, further comprising a molded body that partially covers the leadframe such that the bottom surface of the die pad portion of the first section is exposed in the molded body and the first and second connector portions protrude from the body, the molded body defining a window in which a portion of the receiver die is exposed.

9. The CPV module of claim 1, further comprising a light concentrating device cooperatively engaged with the receiver die.

10. The CPV module of claim 1 wherein the at least two prong portions of the second section extend in spaced, generally parallel relation to the die pad portion of the first section, the connector portion of the first section extends generally perpendicularly relative to the die pad portion thereof, and the connector portion of the second section extends generally perpendicularly relative to the prong portions thereof and in spaced generally parallel relation to the connector portion of the first section.

11. The CPV module of claim 1 wherein the second section of the leadframe further comprises a raised edge which extends along the base and prong portions thereof.

12. The CPV module of claim 11 wherein the second section of the leadframe further includes a cross member portion which extends between and interconnects the prong portions thereof, the raised edge further extending along the cross member portion.

13. A CPV module, comprising:

a leadframe including;

a first section defining a die pad portion having opposed top and bottom surfaces and a connector portion attached to the die pad portion; and

a second section disposed in spaced relation to the first section, the second section including a base portion, a connector portion attached to the base portion, and a pair of prong portions attached to and extending from the base portion in spaced, generally parallel relation to each other;

a receiver die mounted and electrically connected to the die pad portion of the first section, and electrically connected to the prong portions of the second section; and

a molded body which covers a portion of the receiver die, and portions of the first and second sections of the leadframe such that at least the bottom surface of the die pad portion of the first section, the connector portions of the first and second sections, and a portion of the receiver die are exposed in the body.

14. The CPV module of claim 13, wherein the pair of prong portions is attached to an upper surface of the receiver die with conductive bonding material.

15. The CPV module of claim 13, wherein the receiver die is electrically connected to the prong portions of the second section with a plurality of conductive wires.

16. A CPV module, comprising:

a leadframe including;

a first section defining a die pad portion having opposed top and bottom surfaces and a connector portion attached to the die pad portion; and

a second section disposed in spaced relation to the first section, the second section including a base portion, a connector portion attached to the base portion, and a pair of prong portions attached to and extending from the base portion in spaced relation to each other; and

a receiver die having a first major surface and an opposed second major surface, the second major surface mounted and electrically connected to the die pad portion of the first section, wherein surfaces of the prong portions are attached and electrically connected to the first major surface of the receiver die with a conductive bonding material.

17. The CPV module of claim 16 further comprising a molded body that covers a portion of the receiver die, and portions of the first and second sections of the leadframe such that at least a portion of the bottom surface of the die pad portion of the first section, the connector portions of the first and second sections, and a portion of the receiver die are exposed in the molded body.

18. The CPV module of claim 17, wherein the molded body defines a window in which the portion of the receiver die is exposed, and wherein the window is defined by a surface of the molded body that is mechanically adapted to facilitate the alignment of a light concentrating device with the portion of the receiver die exposed in the window.

19. A CPV module, comprising:

a leadframe including a first section and a second section disposed in spaced relation to each other, the first section including a first connector portion and a die pad portion that is attached to the first connector portion and defines opposed top and bottom surfaces, the second section including a frame portion and a second connector portion extending from the frame portion, the frame portion comprising at least two prong portions;

a receiver die mounted and electrically connected to the top surface of the die pad portion, the at least two prong portions attached and electrically connected to the receiver die; and

a molded body that partially covers the leadframe such that the bottom surface of the die pad portion of the first section is exposed in the molded body and the first connector portion and the second connector portion protrude from the body, the molded body defining a window in which a portion of the receiver die is exposed.

20. The CPV module of claim 19, wherein the first and second connector portions of the leadframe extend in side-by-side relation to each other.