Nevinskas Ignas, Mockus Zenius, Juškėnas Remigijus, Norkus Ričardas, Selskis Algirdas, Norkus Eugenijus, Krotkus Arūnas
Center for Physical Sciences and Technology, Saulėtekio al. 3, LT-10257 Vilnius, Lithuania.
Materials (Basel). 2021 Jun 8;14(12):3150. doi: 10.3390/ma14123150.
Electron dynamics in the polycrystalline bismuth films were investigated by measuring emitted terahertz (THz) radiation pulses after their photoexcitation by tunable wavelength femtosecond duration optical pulses. Bi films were grown on metallic Au, Pt, and Ag substrates by the electrodeposition method with the Triton X-100 electrolyte additive, which allowed us to obtain more uniform films with consistent grain sizes on any substrate. It was shown that THz pulses are generated due to the spatial separation of photoexcited electrons and holes diffusing from the illuminated surface at different rates. The THz photoconductivity spectra analysis has led to a conclusion that the thermalization of more mobile carriers (electrons) is dominated by the carrier-carrier scattering rather than by their interaction with the lattice.
通过测量可调谐波长飞秒持续时间光脉冲对多晶铋薄膜进行光激发后发射的太赫兹（THz）辐射脉冲，研究了多晶铋薄膜中的电子动力学。铋薄膜通过电沉积方法在金属金、铂和银基板上生长，并添加了Triton X - 100电解质添加剂，这使我们能够在任何基板上获得具有一致晶粒尺寸的更均匀薄膜。结果表明，太赫兹脉冲是由于光激发电子和空穴以不同速率从光照表面扩散的空间分离而产生的。太赫兹光电导率光谱分析得出的结论是，更多可移动载流子（电子）的热化主要由载流子 - 载流子散射主导，而不是它们与晶格的相互作用。
