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Nanostructures and photovoltaic structures are disclosed. A nanostructure according to one embodiment includes an array of nanocables extending from a substrate, the nanocables in the array being characterized as having a spacing and surface texture defined by inner surfaces of voids of a template;

Nanostructures and photovoltaic structures are disclosed. A nanostructure according to one embodiment includes an array of nanocables extending from a substrate, the nanocables in the array being characterized as having a spacing and surface texture defined by inner surfaces of voids of a template; an electrically insulating layer extending along the substrate; and at least one layer overlaying the nanocables. A nanostructure according to another embodiment includes a substrate; a portion of a template extending along the substrate, the template being electrically insulative; an array of nanocables extending from the template, portions of the nanocables protruding from the template being characterized as having a spacing, shape and surface texture defined by previously-present inner surfaces of voids of the template; and at least one layer overlaying the nanocables.

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1. A structure, comprising: an array of nanostructures extending upwardly from a substrate and having free ends positioned away from the substrate, each of the nanostructures having an electrically conductive metal nanocable therein, the nanocables being characterized as having a spacing and surface

1. A structure, comprising: an array of nanostructures extending upwardly from a substrate and having free ends positioned away from the substrate, each of the nanostructures having an electrically conductive metal nanocable therein, the nanocables being characterized as having a spacing and surface texture defined by inner surfaces of pores of a template, wherein longitudinal axes of the nanocables are oriented parallel to each other; andeach of the nanostructures also having at least two layers overlaying the nanocable thereof,wherein the at least two layers create a photovoltaically active p-n junction,wherein a gap is present between outer surfaces of the nanostructures, andwherein the nanocables and the at least two layers overlying the nanocables form bristles, wherein no solid fill material is present between upper portions of the bristles. 2. The structure as recited in claim 1, wherein the bristles have rounded cross sectional peripheries taken perpendicular to longitudinal axes of the bristles. 3. The structure as recited in claim 1, wherein the template is partially removed from an area adjacent portions of the nanocables thereby exposing the portions of the nanocables above a portion of the template that remains including free ends of the nanocables, wherein a thickness of the template that remains is less than a thickness of the array of nanocables, said thicknesses being measured in a direction perpendicular to a plane of the substrate. 4. The structure as recited in claim 3, further comprising an electrically insulating layer extending along the substrate. 5. The structure as recited in claim 1, wherein the nanocables have substantially uniform peripheries. 6. The structure as recited in claim 1, wherein the nanocables in the array are characterized as having a spacing and surface texture defined by inner surfaces of voids of a membrane template. 7. The structure as recited in claim 1, wherein at least one layer of the at least two layers is an electroplated layer. 8. The structure as recited in claim 1, wherein at least one layer of the at least two layers has a physical structure characterized by formation by chemical vapor deposition and etching. 9. The nanostructure as recited in claim 1, wherein the nanostructures are elongate, wherein axes of the nanostructures are tilted from a direction normal to a plane of the substrate. 10. A photovoltaic structure, comprising: a first array of photovoltaic nanostructures as recited in claim 1; anda second array of photovoltaic nanostructures positioned relative to the first array such that light passing through the second array strikes the first array. 11. The photovoltaic structure as recited in claim 10, wherein the first and second arrays of photovoltaic nanostructures are arranged in a brush configuration, wherein a height of the photovoltaic nanostructures in the first array is different than an average height of the photovoltaic nanostructures in the second array. 12. The photovoltaic structure as recited in claim 10, wherein the photovoltaic nanostructures of the first array have a different composition than the photovoltaic nanostructures of the second array. 13. The photovoltaic structure as recited in claim 12, wherein the photovoltaic nanostructures of the first array comprise an organic material, wherein the photovoltaic nanostructures of the second array comprise inorganic materials. 14. The photovoltaic structure as recited in claim 12, wherein the photovoltaic nanostructures of the first array comprise inorganic materials, wherein the photovoltaic nanostructures of the second array comprise inorganic materials. 15. The photovoltaic structure as recited in claim 10, wherein the nanostructures of the second array are coated with at least one high bandgap material, and the nanostructures of the first array are coated with at least one low bandgap material. 16. The photovoltaic structure as recited in claim 10, wherein each array of photovoltaic nanostructures is arranged in a brush configuration, wherein heights of the photovoltaic nanostructures in the first array are different than heights of the photovoltaic nanostructures in the second array. 17. The photovoltaic structure as recited in claim 10, wherein axes of the photovoltaic nanostructures in each array are tilted from a direction normal to a plane of the array. 18. The photovoltaic structure as recited in claim 10, wherein at least one of the arrays of photovoltaic nanostructures is encapsulated in a substantially transparent optical casing. 19. The photovoltaic structure as recited in claim 10, wherein the arrays of photovoltaic nanostructures are divided into a plurality of cells, the cells being interconnected by daisy chain connections. 20. A method for forming a photovoltaic structure, comprising: coupling a first array of photovoltaic nanostructures as recited in claim 1 to a second array of photovoltaic nanostructures, the second array of photovoltaic nanostructures being positioned relative to the first array such that light passing through the second array strikes the first array. 21. The method as recited in claim 20, wherein the first and second arrays of photovoltaic nanostructures are arranged in a brush configuration, wherein a height of the photovoltaic nanostructures in the first array is different than an average height of the photovoltaic nanostructures in the second array. 22. The method as recited in claim 20, wherein the photovoltaic nanostructures of the first array have the same composition as the photovoltaic nanostructures of the second array. 23. The method as recited in claim 20, wherein the photovoltaic nanostructures of the first array have a different composition than the photovoltaic nanostructures of the second array. 24. The method as recited in claim 23, wherein the photovoltaic nanostructures of the first array comprise an organic material, wherein the photovoltaic nanostructures of the second array comprise inorganic materials. 25. The method as recited in claim 23, wherein the photovoltaic nanostructures of the first array comprise inorganic materials, wherein the photovoltaic nanostructures of the second array comprise inorganic materials. 26. The method as recited in claim 20, wherein the nanostructures of the second array are coated with at least one high bandgap material, and the nanostructures of the first array are coated with at least one low bandgap material. 27. The method as recited in claim 20, wherein each array of photovoltaic nanostructures is arranged in a brush configuration. 28. The method as recited in claim 20, wherein axes of the photovoltaic nanostructures in each array are tilted from a direction normal to a plane of the array. 29. A structure, comprising: a substrate;an array of nanocables extending from the substrate, portions of the nanocables being characterized as having a spacing, shape and surface texture defined by previously-present inner surfaces of pores of a template that has been at least partially removed, wherein the previously-present inner surfaces of the pores of the template are not present adjacent the portions of the nanocables;an electrically insulating layer extending along the substrate in a gap between the nanocables; andat least one layer overlaying the nanocables,wherein the at least one layer creates a photovoltaically active p-n junction,wherein the nanocables and the at least one layer overlying the nanocables form bristles, wherein no solid fill material is present between upper portions of the bristles. 30. The structure as recited in claim 29, further comprising a portion of the template extending along the substrate, the portion of the template having a thickness that is less than a previous thickness thereof at a time when the nanocables were formed therein, said thickness being measured in a direction perpendicular to a plane of the substrate, the template being electrically insulative. 31. The structure as recited in claim 30, wherein a thickness of the template is less than a longitudinal length of the nanocables. 32. The structure as recited in claim 29, wherein the nanocables have substantially uniform peripheries, the nanocables having rounded cross sectional peripheries taken perpendicular to longitudinal axes thereof. 33. The structure as recited in claim 29, wherein the template is a membrane. 34. The structure as recited in claim 29, wherein the at least one layer is an electroplated layer. 35. The structure as recited in claim 29, wherein the at least one layer has a physical structure characterized by formation by chemical vapor deposition and etching. 36. The structure as recited in claim 29, wherein the nanocables are elongate, wherein axes of the nanocables are tilted from a direction normal to a plane of the substrate. 37. The structure as recited in claim 1, wherein each of the nanocables is an electroplated member. 38. The structure as recited in claim 1, wherein thicknesses of the nanocables measured along longitudinal axes thereof are about the same. 39. The structure as recited in claim 1, wherein each of the nanocables has about a constant cross sectional diameter along a longitudinal length thereof. 40. The structure as recited in claim 29, wherein longitudinal axes of the nanocables are oriented parallel to each other. 41. The structure as recited in claim 29, wherein each of the nanocables is an electroplated member. 42. The structure as recited in claim 29, wherein thicknesses of the nanocables measured along longitudinal axes thereof are about the same. 43. The structure as recited in claim 29, wherein each of the nanocables has about a constant cross sectional diameter along a longitudinal length thereof. 44. The structure as recited in claim 1, wherein the free ends of the nanostructures are opposite to ends of the nanostructures closest to the substrate. 45. The structure as recited in claim 1, wherein the layers creating the photovoltaically active p-n junction overlay outside surfaces and the free ends of the nanocables. 46. The structure as recited in claim 3, wherein the layers creating the photovoltaically active p-n junction overlay outside surfaces of the exposed portions of the nanocables above the remaining portion of the template, the layers extending along the outside surfaces of the exposed portions of the nanocables from the remaining portion of the template to the free ends of the nanocables. 47. The structure as recited in claim 1, wherein the template extends only along lower portions of the nanocables, the individual free ends of the nanostructures protruding above the template. 48. The structure as recited in claim 47, wherein upper portions of the nanocables above the template are characterized as having a spacing, shape and surface texture defined by pores of a previously-present portion of the template that defined the upper portions of the nanocables. 49. The structure as recited in claim 1, wherein the nanocables are nanorods or filled nanotubes, over which the at least two layers are formed. 50. The structure as recited in claim 1, wherein the template is not present in the structure. 51. The structure as recited in claim 29, wherein the template is not present in the structure. 52. The structure as recited in claim 29, wherein the template is no longer present or only partially remains and extends along the nanocables to a point on each nanocable below the upper portion of the nanocable. 53. A structure, comprising: a substrate;an array of metal nanocables extending from the substrate, upper portions of the nanocables being characterized as having a spacing, shape and surface texture defined by pores of a template that is no longer present or that only partially remains and extends along the nanocables to a point on each nanocable below the upper portion of the nanocable;at least two layers overlaying the nanocables, thereby forming an array of bristles,wherein the at least two layers create a photovoltaically active p-n junction,wherein each of the bristles has a free end opposite an end of the bristle closest to the substrate,wherein a gap is present between the free ends of the bristles,wherein no solid fill material is present between upper portions of the bristles. 54. The structure as recited in claim 53, wherein at least one layer of the at least two layers overlaying the nanocables includes a layer of CIS, CIGS, and/or CdTe/CdS. 55. The structure as recited in claim 53, wherein at least one layer of the at least two layers overlaying the nanocables includes amorphous silicon. 56. The structure as recited in claim 53, wherein the nanocables include amorphous silicon. 57. The structure as recited in claim 1, wherein at least one layer of the at least two layers overlaying the nanocables includes a layer of CIS, CIGS, and/or CdTe/CdS. 58. The structure as recited in claim 1, wherein at least one layer of the at least two layers overlaying the nanocables includes amorphous silicon. 59. The structure as recited in claim 1, wherein the nanostructures include amorphous silicon. 60. The structure as recited in claim 29, wherein the at least one layer overlaying the nanocables includes a layer of CIS, CIGS, and/or CdTe/CdS. 61. The structure as recited in claim 29, wherein the at least one layer overlaying the nanocables includes amorphous silicon. 62. The structure as recited in claim 29, wherein the nanocables include amorphous silicon.