Microsystem enabled photovoltaic modules and systems
A photovoltaic (PV) module includes an absorber layer coupled to an optic layer. The absorber layer includes an array of PV elements. The optic layer includes a close-packed array of Keplerian telescope elements, each corresponding to one of an array of pupil elements. The Keplerian telescope substantially couple radiation that is incident on their objective surfaces into the corresponding pupil elements. Each pupil element relays radiation that is coupled into it from the corresponding Keplerian telescope element into the corresponding PV element.
1. Apparatus comprising at least one photovoltaic (PV) module, wherein the PV module comprises:
an absorber layer including an array of PV elements, each PV element having a top surface; and
an optic layer coupled to the absorber layer, the optic layer including an array of Keplerian telescope elements and an array of pupil elements in which the pupil elements correspond one-to-one with the PV elements and the Keplerian telescope elements correspond one-to-one with the pupil elements;
wherein:
each Keplerian telescope element comprises an eyepiece lens and an objective lens having an objective surface;
the objective lenses form a close-packed array;
the objective surfaces are 25-200 times greater in area than the PV element top surfaces;
each Keplerian telescope element is configured so that, in operation, its objective lens in cooperation with at least a portion of its eyepiece lens will form a solar image or quasi-image in front of its pupil element; and
each pupil element is configured to relay substantially all of the radiation in the solar image or quasi-image formed by its corresponding Keplerian telescope element in a collimated or diverging beam onto the corresponding PV element.
2. The apparatus of claim 1 , wherein the absorber layer of the PV module includes at least one of:
a type III/V semiconductor material;
a type IV semiconductor material;
a type II/VI semiconductor material; or
a thermal photovoltaic element.
3. The apparatus of claim 1 , wherein the array of pupil elements of the PV module is formed of crown glass or of a plastic material having an Abbe number similar to that of crown glass.
4. The apparatus of claim 1 , wherein the optic layer and the absorber layer of the PV module are designed to mechanically snap together.
5. The apparatus of claim 1 , wherein the PV module is adapted to accept incident radiation over a field of view up to about ±14°.
6. The apparatus of claim 1 , further comprising:
at least one right-ascension tilt stage;
at least one tilt stage coarse controller coupled to the at least one right-ascension tilt stage to provide coarse right-ascension tracking of the sun each day; and
a panel base coupled to each right-ascension tilt stage; wherein:
at least one said PV module is coupled to each panel base.