飞秒超短脉冲激光对硅太阳能电池的损伤阈值研究  

Damage threshold research of monocrystalline silicon solar cells under femtosecond laser illumination

作　　者：田秀芹[1] 肖思[1] 陶少华[1] 袁战忠 周炎强 

机构地区：[1]中南大学物理与电子学院超微结构与超快过程研究所,湖南长沙410000

出　　处：《红外与激光工程》2014年第3期676-680,共5页Infrared and Laser Engineering

基　　金：国家青年科学基金(11104356)

摘　　要：首次采用飞秒超短脉冲激光(≤35 fs),研究其对硅太阳能电池的损伤阈值。与相同波长的连续激光对比,飞秒激光的损伤阈值略高。这一结果不同于纳秒或皮秒激光,主要是因为当加热脉冲时间相当或小于电子-声子耦合时间时,非热平衡效应显著,热传导现象不再满足Fourier定律。在实验中采用了光束整形技术,首次采用强度均匀分布的激光研究损伤阈值。此技术能减小高斯激光中心光强过大造成的实验偏差。Femtosecond laser with ultrashort pulse （≤35 fs） was first applied to investigate damage threshold of a monocrystalline silicon solar cell. Compared with a continuous-wave laser of the same central wavelength, a femtosecond laser pulse was found to have a slightly higher damage threshold. Unlike nanosecond or picosecond lasers, the femtosecond laser has heating pulse time equal to or shorter than the electron- phonon coupling time. Thus, the thermal non-equilibrium effect becomes obvious, and the heat conduction phenomenon no longer meets the law of Fourier. In the damage threshold experiments, a beam shaping technique was applied for a femtosecond laser to generate uniform intensity distribution, which could prevent experimental deviation caused by great concentrated intensity distribution of a conventional laser pulse with the Gaussian profile.

关 键 词：飞秒超短脉冲激光 太阳能电池 损伤阈值 光束整形 

分 类 号：TN249[电子电信—物理电子学]