Wafer-level flip chip device packages and related methods

Patent metadata

Field	Value
Publication number	US-9236502-B2
Application number	US-201414523433-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Jan 24, 2012
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

In accordance with certain embodiments, semiconductor dies are at least partially coated with a polymer and a conductive adhesive prior being bonded to a substrate having electrical traces thereon.

First claim

What is claimed is:

1. An electronic device comprising:
a solid shaped volume of a polymeric binder;
suspended within the polymeric binder, a semiconductor die having a first face, a second face opposite the first face, and at least one sidewall spanning the first and second faces, the semiconductor die being a light-detecting element comprising at least one semiconductor layer configured to absorb light over a detected wavelength range and produce electrical charge therefrom;
disposed on the first face of the semiconductor die, at least two spaced-apart contacts each having a free terminal end not covered by the polymeric binder, at least one of the contacts contacting at least one said semiconductor layer of the semiconductor die; and
disposed over a portion of the polymeric binder and in electrical contact with the terminal ends of the contacts, an anisotropic conductive adhesive (ACA), wherein at least a portion of the polymeric binder is transparent to a wavelength of light within the detected wavelength range.

2. The electronic device of claim 1 , wherein the light-detecting element is a bare-die light-detecting element.

3. The electronic device of claim 1 , wherein at least a portion of the polymeric binder contains therein a wavelength-conversion material for absorption of at least a portion of light incident on the electronic device and emission of converted light having a different wavelength.

4. The electronic device of claim 3 , wherein substantially all of the light absorbed by the light-detecting element is converted light.

5. The electronic device of claim 3 , wherein the different wavelength of the converted light is within the detected wavelength range.

6. The electronic device of claim 3 , wherein the polymeric binder comprises a plurality of discrete regions, at least one of which comprises the polymeric binder without wavelength-conversion material therein.

7. The electronic device of claim 3 , further comprising a reflecting layer over or within at least a portion of the polymeric binder, wherein the reflecting layer has a reflectivity of at least 50% to a wavelength of light emitted by the wavelength-conversion material.

8. The electronic device of claim 7 , wherein the reflecting layer has a reflectivity of at least 75% to a wavelength of light emitted by the wavelength-conversion material.

9. The electronic device of claim 1 , wherein at least a portion of the polymeric binder comprises therein an absorbing material for absorption of at least a portion of the spectrum of light incident upon the electronic device.

10. The electronic device of claim 9 , wherein a wavelength of the at least a portion of the spectrum of light absorbed by the absorbing material is within the detected wavelength range.

11. The electronic device of claim 9 , wherein a wavelength of the at least a portion of the spectrum of light absorbed by the absorbing material is longer than the detected wavelength range.

12. The electronic device of claim 9 , wherein a wavelength of the at least a portion of the spectrum of light absorbed by the absorbing material is shorter than the detected wavelength range.

13. The electronic device of claim 9 , wherein the polymeric binder comprises a plurality of discrete regions, at least one of which comprises the polymeric binder without the absorbing material therein.

14. The electronic device of claim 1 , wherein at least portions of the contacts protrude from the polymeric binder.

15. The electronic device of claim 1 , wherein only a portion of each sidewall protrudes from the polymeric binder, a portion of each sidewall being covered with the polymeric binder.

16. The electronic device of claim 1 , wherein the polymeric binder comprises at least one of silicone or epoxy.

17. The electronic device of claim 1 , further comprising one or more additional semiconductor dies suspended within the polymeric binder.

18. The electronic device of claim 1 , wherein the semiconductor die comprises a bare-die photovoltaic cell.

19. The electronic device of claim 1 , wherein the semiconductor die comprises at least one of a bare-die photovoltaic cell, a bare-die infrared detector, a bare-die ultraviolet detector, a bare-die visible light detector, or a bare-die x-ray detector.

20. The electronic device of claim 1 , wherein the semiconductor die comprises at least one of a p-n junction, a Schottky junction, a photoelectric detector, a photocell, a photoresistor, a photodiode, a phototransistor, a charge-coupled device, or a bare-die imaging chip.

21. The electronic device of claim 1 , wherein the at least one semiconductor layer configured to absorb light over a detected wavelength range and produce electrical charge therefrom is not disposed on a semiconductor substrate.

22. The electronic device of claim 1 , wherein the polymeric binder coats at least a portion of the at least one sidewall and at least a portion of the second face of the semiconductor die.

23. The electronic device of claim 1 , wherein at least a portion of a top surface of the polymeric binder is curved.

24. The electronic device of claim 1 , further comprising an optical element positioned to couple light to the polymeric binder.

25. The electronic device of claim 1 , further comprising an optical element positioned to couple light to the semiconductor die.

26. The electronic device of claim 1 , further comprising a reflecting layer over or within at least a portion of the polymeric binder.

27. The electronic device of claim 26 , wherein the reflectivity of the reflecting layer to a wavelength of light within the detected wavelength range is at least 75%.

28. The electronic device of claim 1 , wherein the polymeric binder comprises therein a reflective material for reflection of at least a portion of the spectrum of light incident upon electronic device.

29. The electronic device of claim 28 , wherein a wavelength of the at least a portion of the spectrum of light reflected by the reflective material is longer than the detected wavelength range.

30. The electronic device of claim 28 , wherein a wavelength of the at least a portion of the spectrum of light reflected by the reflective material is shorter than the detected wavelength range.

31. The electronic device of claim 28 , wherein the polymeric binder comprises a plurality of discrete regions, at least one of which comprises the polymeric binder without the reflective material therein.

32. The electronic device of claim 1 , wherein the ACA comprises an anisotropic conductive film.

33. The electronic device of claim 1 , wherein at least a portion of the ACA opposite the contacts is free and available for electrical connection.

34. The electronic device of claim 1 , wherein the terminal ends of the at least two contacts are in physical contact with the ACA.

35. The electronic device of claim 1 , further comprising a substrate having a plurality of conductive elements disposed thereon, wherein (i) at least two said contacts on the first face of the semiconductor die are each electrically coupled to a different conductive element on the substrate via the ACA and (ii) the at least two said contacts are electrically insulated from each other through the ACA.

36. The elec

Assignees

• Tischler Michael A
• Cooledge Lighting Inc

Inventors

• Tischler Michael A

Classifications

• H10W90/00

  Package configurations · CPC title

• H10W74/15

  on active surfaces of flip-chip devices, e.g. underfills · CPC title

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10W72/9413

  on encapsulations · CPC title

• H10W72/073

  of die-attach connectors · CPC title