Patent Number: 
Section: claims

1. A micro-scale power source, comprising:a semiconductor structure having a p-n junction formed of wide band-gap materials;a radioisotope providing energy to said p-n junction; anda radiation shield located within said semiconductor structure, wherein said radiation shield comprises a high density rare gas radioactive isotope micro bubble, wherein said high density causes excimer states in the rare gas radioactive isotope that decay to produce photons. 2. A micro-scale power source, comprising:a semiconductor structure having a p-n junction formed of wide band-gap materials;a radioisotope providing energy to said p-n junction; anda radiation shield located within said semiconductor structure, wherein said radiation shield comprises implanted atoms defining a high density rare gas micro bubble that is a small volume within said semiconductor structure having a locally changed band-gap, wherein said high density causes excimer states in the rare gas that decay to produce photons. 3. The power source of claim 2, wherein the p-n junction is formed from the group consisting of doped aluminum nitride, diamond, GaN or SiC. 4. The power source of claim 2, the p-n junction being formed on a first contact, the radioisotope formed on an opposite side of the p-n junction, further comprising a protecting coating on the radioisostope, and a second contact on the opposite side of the p-n junction. 5. The power source of claim 4, integrated in a MEMS device, the first and second contacts being part of a connection pattern in the MEMS device. 6. The power source of claim 2, wherein the radioisotope is formed as a thin layer. 7. The power source of claim 2, wherein said radioisotope is supported on an upper surface of said p-n junction, and wherein the power source further comprises:a first contact underlying said p-n junction opposite from said radioisotope; and,a second contact on said upper surface of said p-n junction and surrounding a perimeter of said radioisotope. 8. The power source of claim 7 and further comprising a protective coating layer over said radioisotope, said second contact surrounding the perimeter of said coating layer. 9. The power source of claim 8 and further comprising a cover over said protective coating layer, said cover not extending over said second contact and wherein a top surface of said second contact layer remains exposed. 10. The power source of claim 2, wherein said micro bubble is non-radioactive. 11. A micro-scale power source, comprising:a semiconductor structure having a p-n junction formed of wide band-gap materials;a radioisotope providing energy to said p-n junction; anda radiation shield located within said semiconductor structure, wherein said radiation shield comprises a high density micro bubble filled with one of Kr or Xe, wherein said high density causes excimer states in the KR or Xe that decay to produce photons. 12. A method of forming a power source, comprising the steps of:forming a semiconductor structure having a p-n junction of wide band-gap materials;implanting rare gas atoms in said semiconductor structure to form a micro bubble having high gas pressure defining a small volume of locally changed band-gap, wherein said gas pressure creates high density of the rare gas atoms sufficient to cause excimer states in the rare gas atoms that decay to produce photons; andproviding radioactive energy to said p-n junction,wherein said implanted atoms are excited to produce photons in said micro bubble, said photons impinging upon said p-n junction to generate electrical power. 13. The method of forming a power source of claim 12, wherein said implanting atoms step comprises implanting rare gas ions under several Giga Pascal of pressure. 14. The method of forming a power source of claim 13, wherein said rare gas ions comprise one of Kr and Xe. 15. The method of claim 12, wherein said photons comprise UV photons.