| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and a device for low implant or implant free layer transfer of thick films for solar cells. <P>SOLUTION: A film of material can be formed by providing a semiconductor substrate having a surface region and a cleave region located at a predetermined depth beneath the surface region. During a process of cleaving the film from the substrate, shear in the cleave region is carefully controlled to achieve controlled propagation by either KII or energy propagation control. According to certain embodiments, an in-plane shear component (KII) is maintained near zero by adiabatic heating of silicon through exposure to E-beam radiation. According to other embodiments, a surface heating source in combination with an implanted layer serves to guide fracture propagation through the cleave sequence. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
