An SOI substrate having a single crystal semiconductor layer with high surface planarity is manufactured. A semiconductor substrate is doped with hydrogen, whereby a damaged region which contains large quantity of hydrogen is formed. After a single crystal semiconductor substrate and a supporting su
An SOI substrate having a single crystal semiconductor layer with high surface planarity is manufactured. A semiconductor substrate is doped with hydrogen, whereby a damaged region which contains large quantity of hydrogen is formed. After a single crystal semiconductor substrate and a supporting substrate are bonded together, the semiconductor substrate is heated, whereby the single crystal semiconductor substrate is separated in the damaged region. While a heated high-purity nitrogen gas is sprayed on a separation plane of the single crystal semiconductor layer separated from the single crystal semiconductor substrate, laser beam irradiation is performed. By irradiation with a laser beam, the single crystal semiconductor layer is melted, whereby planarity of the surface of the single crystal semiconductor layer is improved and re-single-crystallization is performed.
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What is claimed is: 1. A method for manufacturing a semiconductor device comprising: fixing a single crystal semiconductor layer over a glass substrate with a buffer layer interposed therebetween; and while blowing a heated nitrogen gas to heat the single crystal semiconductor layer at temperature
What is claimed is: 1. A method for manufacturing a semiconductor device comprising: fixing a single crystal semiconductor layer over a glass substrate with a buffer layer interposed therebetween; and while blowing a heated nitrogen gas to heat the single crystal semiconductor layer at temperature of a strain point or lower of the glass substrate, irradiating a part of the single crystal semiconductor layer with a laser beam to melt an upper layer of the single crystal semiconductor layer with a lower layer of the single crystal semiconductor layer left as a single crystal semiconductor and perform re-single-crystallization of the single crystal semiconductor layer to be a single crystal semiconductor having a same crystal orientation as a crystal orientation of the single crystal semiconductor in the lower layer. 2. A method for manufacturing a semiconductor device according to claim 1, wherein a defect in a portion of a single crystal melted by irradiation with the laser beam is repaired during the re-single-crystallization. 3. A method for manufacturing a semiconductor device according to claim 1, wherein the glass substrate is one of a non-alkali glass substrate (product name: AN100), a non-alkali glass substrate (product name: EAGLE2000 (registered trademark)), and a non-alkali glass substrate (product name: EAGLE XG (registered trademark)). 4. A method for manufacturing a semiconductor device according to claim 1, wherein the buffer layer has a stacked structure and includes a barrier layer for preventing sodium from entering the single crystal semiconductor layer. 5. A method for manufacturing a semiconductor device according to claim 1, wherein the buffer layer has a stacked structure and includes one of a silicon nitride film and a silicon nitride oxide film and an oxide film obtained by oxidizing the single crystal semiconductor substrate. 6. A method for manufacturing a semiconductor device according to claim 1, wherein the buffer layer has a stacked structure and includes a bonding layer to be bonded to one of the glass substrate and the single crystal semiconductor substrate. 7. A method for manufacturing a semiconductor device according to claim 1, wherein the buffer layer has a stacked structure, and includes a bonding layer bonded to the glass substrate, an insulating film which is in contact with the single crystal semiconductor layer, and a barrier layer for preventing sodium from entering the single crystal semiconductor layer formed between the bonding layer and the insulating film. 8. A method for manufacturing a semiconductor device according to claim 7, wherein the insulating film which is in contact with the single crystal semiconductor layer is one of a silicon oxide film and a silicon oxynitride film and an insulating film containing a halogen. 9. A method for manufacturing a semiconductor device according to claim 1, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppm or less. 10. A method for manufacturing a semiconductor device according to claim 1, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppb or less. 11. A method for manufacturing a semiconductor device according to claim 1, wherein the nitrogen gas is blown from both a front side and a back side of the glass substrate. 12. A method for manufacturing a semiconductor device comprising: fixing a single crystal semiconductor layer over a glass substrate with a buffer layer interposed therebetween; and while blowing a heated nitrogen gas to heat the single crystal semiconductor layer at temperature of a strain point or lower of the glass substrate, irradiating a part of the single crystal semiconductor layer with a laser beam to melt an entire layer of the single crystal semiconductor layer overlapping with the irradiated part in a depth direction and perform re-single-crystallization of the single crystal semiconductor layer to be a single crystal semiconductor having a same crystal orientation as a crystal orientation of a single crystal semiconductor in a region of the single crystal semiconductor layer adjacent to the part of the single crystal semiconductor layer irradiated with the laser beam. 13. A method for manufacturing a semiconductor device according to claim 12, wherein a defect in a portion of a single crystal melted by irradiation with the laser beam is repaired during the re-single-crystallization. 14. A method for manufacturing a semiconductor device according to claim 12, wherein the glass substrate is one of a non-alkali glass substrate (product name: AN100), a non-alkali glass substrate (product name: EAGLE2000 (registered trademark)), and a non-alkali glass substrate (product name: EAGLE XG (registered trademark)). 15. A method for manufacturing a semiconductor device according to claim 13, wherein the buffer layer has a stacked structure and includes a barrier layer for preventing sodium from entering the single crystal semiconductor layer. 16. A method for manufacturing a semiconductor device according to claim 12, wherein the buffer layer has a stacked structure and includes one of a silicon nitride film and a silicon nitride oxide film and an oxide film obtained by oxidizing the single crystal semiconductor substrate. 17. A method for manufacturing a semiconductor device according to claim 12, wherein the buffer layer has a stacked structure and includes a bonding layer to be bonded to one of the glass substrate and the single crystal semiconductor substrate. 18. A method for manufacturing a semiconductor device according to claim 12, wherein the buffer layer has a stacked structure, and includes a bonding layer bonded to the glass substrate, an insulating film which is in contact with the single crystal semiconductor layer, and a barrier layer for preventing sodium from entering the single crystal semiconductor layer formed between the bonding layer and the insulating film. 19. A method for manufacturing a semiconductor device according to claim 18, wherein the insulating film which is in contact with the single crystal semiconductor layer is one of a silicon oxide film and a silicon oxynitride film and an insulating film containing a halogen. 20. A method for manufacturing a semiconductor device according to claim 12, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppm or less. 21. A method for manufacturing a semiconductor device according to claim 12, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppb or less. 22. A method for manufacturing a semiconductor device according to claim 12, wherein the nitrogen gas is blown from both a front side and a back side of the glass substrate. 23. A method for manufacturing a semiconductor device comprising: fixing a single crystal semiconductor layer over a glass substrate with a buffer layer interposed therebetween; while blowing a heated nitrogen gas to heat the glass substrate to which the single crystal semiconductor layer is fixed at temperature of a strain point or lower of the glass substrate, irradiating a part of the single crystal semiconductor layer with a linear laser beam to perform re-single-crystallization of the single crystal semiconductor layer to be a single crystal semiconductor having a same crystal orientation as a crystal orientation of a single crystal semiconductor in a lower layer; and the glass substrate is moved in a direction perpendicular to a longitudinal direction in a region irradiated with the linear laser beam to perform re-single-crystallization and planarization of the single crystal semiconductor layer. 24. A method for manufacturing a semiconductor device according to claim 23, wherein a defect in a portion of a single crystal melted by irradiation with the laser beam is repaired during the re-single-crystallization. 25. A method for manufacturing a semiconductor device according to claim 23, wherein the glass substrate is one of a non-alkali glass substrate (product name: AN100), a non-alkali glass substrate (product name: EAGLE2000 (registered trademark)), and a non-alkali glass substrate (product name: EAGLE XG (registered trademark)). 26. A method for manufacturing a semiconductor device according to claim 23, wherein the buffer layer has a stacked structure and includes a barrier layer for preventing sodium from entering the single crystal semiconductor layer. 27. A method for manufacturing a semiconductor device according to claim 23, wherein the buffer layer has a stacked structure and includes one of a silicon nitride film and a silicon nitride oxide film and an oxide film obtained by oxidizing the single crystal semiconductor substrate. 28. A method for manufacturing a semiconductor device according to claim 23, wherein the buffer layer has a stacked structure and includes a bonding layer to be bonded to one of the glass substrate and the single crystal semiconductor substrate. 29. A method for manufacturing a semiconductor device according to claim 23, wherein the buffer layer has a stacked structure, and includes a bonding layer bonded to the glass substrate, an insulating film which is in contact with the single crystal semiconductor layer, and a barrier layer for preventing sodium from entering the single crystal semiconductor layer formed between the bonding layer and the insulating film. 30. A method for manufacturing a semiconductor device according to claim 29, wherein the insulating film which is in contact with the single crystal semiconductor layer is one of a silicon oxide film and a silicon oxynitride film and an insulating film containing a halogen. 31. A method for manufacturing a semiconductor device according to claim 23, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppm or less. 32. A method for manufacturing a semiconductor device according to claim 23, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppb or less. 33. A method for manufacturing a semiconductor device according to claim 23, wherein the nitrogen gas is blown from both a front side and a back side of the glass substrate. 34. A method for manufacturing a semiconductor device comprising: fixing a single crystal semiconductor layer over a glass substrate with a buffer layer interposed therebetween; while blowing a heated nitrogen gas to heat the glass substrate to which the single crystal semiconductor layer is fixed at temperature of a strain point or lower of the glass substrate, irradiating a part of the single crystal semiconductor layer with a linear laser beam to melt an entire layer of the single crystal semiconductor layer overlapping with the irradiated part in a depth direction and perform re-single-crystallization of the single crystal semiconductor layer to be a single crystal semiconductor having a same crystal orientation as a crystal orientation of a single crystal semiconductor in a region adjacent to the part of the single crystal semiconductor layer irradiated with the laser beam; and the glass substrate is moved in a direction perpendicular to a longitudinal direction in a region irradiated with the linear laser beam to perform re-single-crystallization and planarization of the single crystal semiconductor layer. 35. A method for manufacturing a semiconductor device according to claim 34, wherein a defect in a portion of a single crystal melted by irradiation with the laser beam is repaired during the re-single-crystallization. 36. A method for manufacturing a semiconductor device according to claim 34, wherein the glass substrate is one of a non-alkali glass substrate (product name: AN100), a non-alkali glass substrate (product name: EAGLE2000 (registered trademark)), and a non-alkali glass substrate (product name: EAGLE XG (registered trademark)). 37. A method for manufacturing a semiconductor device according to claim 34, wherein the buffer layer has a stacked structure and includes a barrier layer for preventing sodium from entering the single crystal semiconductor layer. 38. A method for manufacturing a semiconductor device according to claim 34, wherein the buffer layer has a stacked structure and includes one of a silicon nitride film and a silicon nitride oxide film and an oxide film obtained by oxidizing the single crystal semiconductor substrate. 39. A method for manufacturing a semiconductor device according to claim 34, wherein the buffer layer has a stacked structure and includes a bonding layer to be bonded to one of the glass substrate and the single crystal semiconductor substrate. 40. A method for manufacturing a semiconductor device according to claim 34, wherein the buffer layer has a stacked structure, and includes a bonding layer bonded to the glass substrate, an insulating film which is in contact with the single crystal semiconductor layer, and a barrier layer for preventing sodium from entering the single crystal semiconductor layer formed between the bonding layer and the insulating film. 41. A method for manufacturing a semiconductor device according to claim 40, wherein the insulating film which is in contact with the single crystal semiconductor layer is one of a silicon oxide film and a silicon oxynitride film and an insulating film containing a halogen. 42. A method for manufacturing a semiconductor device according to claim 34, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppm or less. 43. A method for manufacturing a semiconductor device according to claim 34, wherein concentration of an oxygen gas in the nitrogen gas is 30 ppb or less. 44. A method for manufacturing a semiconductor device according to claim 34, wherein the nitrogen gas is blown from both a front side and a back side of the glass substrate.
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