论文标题
单晶型胞胎蒸馏醛拓制拓扑剂中的照片观察效果
Photo-Seebeck effect in single-crystalline bismuth telluride topological insulator
论文作者
论文摘要
肽尿酸酯是具有导电状态的低能带隙拓扑系统。除了其非常好的热电特性外，它还为宽带光电探测器提供了非常好的候选者。在这里，我们报告了体积依赖的光见解效应，在散装的单晶晶体醇尿酸氢酸酯中。在光照射下，由于Seebeck效应和样品狭窄层内的正常光子生成的载体，电偏见的样品在测得的电流中显示出可区分的贡献。进行详细的实验，以阐明Seebeck贡献与光生电流之间的区别。没有塞贝克贡献的光电流的温度依赖性表明，根据光激发光的波长，在特定温度下从阴性到正的符号逆转。
Bismuth telluride is a low energy bulk band-gap topological system with conducting surface states. Besides its very good thermoelectric properties, it also makes a very good candidate for broadband photodetectors. Here, we report temperature-dependent photo-Seebeck effect in a bulk single crystalline bismuth telluride. On light illumination, an electrically biased sample shows distinguishable contributions in the measured current due to both the Seebeck effect and the normal photo-generated carriers within a narrow layer of the sample. Detailed experiments are performed to elucidate the distinction between the Seebeck contribution and the photogenerated current. The temperature-dependence of the photocurrent without Seebeck contribution shows a sign reversal from negative to positive at a specific temperature depending on the wavelength of photoexcitation light.
