原子层热电堆材料的激光感生热电电压

Laser Induced Thermoelectric Voltage of Atomic Layer Thermopile Materials

测量了La1-xSrxMnO3（LSMO）,La1-xPbxMnO3（LPMO）和La1-xSrxCoO3（LSCO）三种薄膜在不同激光波长下的激光感生热电电压（LITV）.利用脉冲激光沉积（PLD）,在LaAlO3倾斜衬底上制备了钙钛矿结构的三种薄膜,并用电脑采集系统和锁相斩波系统对激光感生热电电压信号进行测量。发现不同波长下信号的灵敏度和响应时间各不相同,激光波长为532nm和632.8nm时LSMO灵敏度最大而LSCO最小,但响应时间恰好相反。波长为808nm时LPMO灵敏度最好。

Laser induced thermoelectric voltage （LITV） signals from thin films of La1-xSrxMnO3（LSMO）,La1-xPbxMnO3（LPMO） and La1-xSrxCoO3（LSCO） were measured at different wavelengths. The three thin films grown on vicinal cut LaAlO3 single crystal substrate were prepared by pulsed laser deposition （PLD）. Computer controlled system with lock-in amplifier was used to measured LITV signal. It was found that sensitivity and time response were different at different wavelengths. At wavelengths of 532 nm and 632.8 nm, the sensitivity of LSMO was the largest and that of LSCO was the smallest, but the time response of LSMO and LSCO was opposite. However, the LPMO has the largest sensitivity at wavelength of 808 nm.