MONOLITHIC IMOD COLOR ENHANCED PHOTOVOLTAIC CELL

• US 20100096006A1
• Filed: 03/02/2009
• Published: 04/22/2010
• Est. Priority Date: 10/16/2008
• Status: Abandoned Application

• Current Assignee: Snaptrack Incorporated (Qualcomm, Inc.)
• Original Assignee: Qualcomm MEMS Technologies Incorporated (Qualcomm, Inc.)
• Inventors: Griffiths, Jonathan C., Kothari, Manish
• Application Number:
  US12/396,000
• Publication Number:
  US 20100096006A1
• Time in Patent Office: Days
• US Class Current: 136/256
• CPC Class Codes: G02B 26/001 based on interference in an adjustable optical cavity interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26
• CPC Class Codes: G02B 5/288 comprising at least one thin film resonant cavity, e.g. in bandpass filters
• CPC Class Codes: H01L 31/02 Details
• CPC Class Codes: H01L 31/02168 the coatings being antireflective or having enhancing optical properties for the solar cells
• CPC Class Codes: H01L 31/0543 comprising light concentrating means of the refractive type, e.g. lenses
• 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

Devices incorporating an interferometric stack in a photovoltaic device and method of manufacturing a photovoltaic device comprising an interferometric stack. In one example, a photovoltaic device includes a photovoltaic active layer, an absorber layer, and a first optical resonant cavity layer. The optical resonant cavity layer is disposed between the absorber layer and photovoltaic active layer forming an interferometric modulator. The interferometric modulator is configured to reflect a uniform color. In another example, a method of manufacturing a photovoltaic device includes depositing a photovoltaic active layer on an interferometric stack. The interferometric stack can include an absorber layer and a first optical resonant cavity. The photovoltaic active layer is deposited on the optical resonant cavity and the formed photovoltaic device is reflects a uniform color.

Claims

1. A photovoltaic device defining a front side on which light is incident, the photovoltaic device comprising:

a photovoltaic active layer having a front side and a back side;

an absorber layer; and

a first optical resonant cavity defined by the front side of the photovoltaic active layer and the absorber layer.

2. The device of claim 1, wherein the first optical resonant cavity comprises a first spacer layer.

3. The device of claim 2, wherein the spacer layer comprises a transparent conductive oxide layer.

4. The device of claim 1, wherein the first optical resonant cavity has a height between 700 Å

and 5000 Å

.

5. The device of claim 3, wherein the first spacer layer further comprises a color setting spacer disposed between the absorber layer and the transparent conductive oxide layer.

6. The device of claim 1, further comprising a second optical resonant cavity.

7. The device of claim 6, further comprising a reflector, and wherein the second optical resonant cavity is defined by the back side of the photovoltaic active layer and the reflector.

8. The device of claim 6, wherein the second optical resonant cavity comprises a second spacer layer.

9. The device of claim 7, wherein the reflector comprises metal.

10. The device of claim 8, wherein the second spacer layer comprises transparent conductive oxide.

11. The device of claim 1, wherein the first optical resonant cavity is configured to reflect a uniform color.

12. The device of claim 1, wherein the photovoltaic layer comprises photovoltaic material selected from the group consisting of single crystal silicon, amorphous silicon, germanium, III-V semiconductors, copper indium, gallium selenide, cadmium telluride, gallium arsenide, indium nitride, gallium nitride, boron arsenide, indium gallium nitride, and tandem multi-junction photovoltaic materials.

13. The device of claim 1, wherein a height of the first optical resonant cavity is not uniform across the photovoltaic device.

14. The device of claim 13, wherein the first optical resonant cavity height is patterned such that the photovoltaic device comprises two or more regions, each region with a different first optical resonant cavity height corresponding to a different reflected color.

15. The device of claim 1, wherein a height of the first optical resonant cavity is uniform across the photovoltaic device.

16. The device of claim 1, wherein a height of the absorber is not uniform across the photovoltaic device.

17. The device of claim 1, wherein the absorber layer has a thickness between 20 Å

and 300 Å

.

18. The device of claim 1, wherein the absorber layer has a thickness between 20 Å

and 35 Å

.

19. The device of claim 1, wherein the absorber layer comprises metal.

20. The device of claim 1, wherein the photovoltaic active layer comprises a thin film photovoltaic material.

21. The device of claim 20, wherein the thin film comprises amorphous silicon.

22. A method of manufacturing a photovoltaic device, the method comprising:

providing an interferometric stack comprising an absorber layer on a substrate and a first optical resonant cavity defined on a first side by the absorber layer; and

depositing a photovoltaic active layer on the interferometric stack, the photovoltaic active layer defining a second side of the first optical resonant cavity.

23. The method of claim 22, wherein the interferometric stack is pre-tuned to reflect a certain color when the photovoltaic active layer is deposited upon it.

24. The method of claim 22, wherein the first optical resonant cavity comprises a first spacer layer.

25. The method of claim 24, wherein the spacer layer comprises a transparent conductive oxide.

26. The method of claim 22, wherein the first optical resonant cavity has a height between 500 Å

and 5000 Å

.

27. The method of claim 22, wherein the absorber layer has a thickness between 20 Å

and 300 Å

.

28. A photovoltaic device comprising:

an interferometric modulator comprising a photovoltaic active layer.

29. The photovoltaic device of claim 28, wherein the photovoltaic active layer has a front side and a back side and the device further comprises a first optical resonant cavity defined by the front side of the photovoltaic active layer.

30. The device of claim 29 wherein the first optical resonant cavity comprises a first spacer layer.

31. The device of claim 30, wherein the first spacer layer comprises a transparent conductive oxide layer.

32. The device of claim 29, further comprising an absorber layer, the absorber layer configured to reflect at least some light and transmit at least some light.

33. The device of claim 29, further comprising a second optical resonant cavity defined by the back side of the photovoltaic active layer.

34. The device of claim 32, wherein the absorber layer has a thickness between 20 Å

and 300 Å

.

35. The device of claim 28, wherein the first optical resonant cavity has a height between 300 Å

and 5000 Å

.

36. The device of claim 33, further comprising a reflector configured to reflect at least some light and wherein the second optical resonant cavity is disposed between the back side of the photovoltaic active layer and the reflector.

37. The device of claim 36, wherein the reflector is a partial reflector.

38. The device of claim 28, wherein the photovoltaic active layer comprises a thin film photovoltaic material.

39. A photovoltaic device defining a front side on which light is incident, the photovoltaic device comprising:

a first means for partially reflecting light incident on the front side;

a second means for partially reflecting light incident on the front side that has passed through the first means; and

a first optical resonant cavity defined by the first means and the second means.

40. The device of claim 39, wherein the first means comprises a photovoltaic active layer.

41. The device of claim 39, wherein the second means comprises an absorber layer.