Hsu Hung-Pin, Lin Der-Yuh, Jheng Jhin-Jhong, Lin Pin-Cheng, Ko Tsung-Shine
Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Department of Electronic Engineering, National Changhua University of Education, Changhua 50074, Taiwan.
Materials (Basel). 2019 Apr 10;12(7):1161. doi: 10.3390/ma12071161.
The optical properties of WSe₂-layered crystals doped with 0.5% niobium (Nb) grown by the chemical vapor transport method were characterized by piezoreflectance (PzR), photoconductivity (PC) spectroscopy, frequency-dependent photocurrent, and time-resolved photoresponse. With the incorporation of 0.5% Nb, the WSe₂ crystal showed slight blue shifts in the near band edge excitonic transitions and exhibited strongly enhanced photoresponsivity. Frequency-dependent photocurrent and time-resolved photoresponse were measured to explore the kinetic decay processes of carriers. Our results show the potential application of layered crystals for photodetection devices based on Nb-doped WSe₂-layered crystals.
采用化学气相输运法生长的掺有0.5%铌（Nb）的WSe₂层状晶体的光学性质，通过压阻反射（PzR）、光电导（PC）光谱、频率相关光电流和时间分辨光响应进行了表征。掺入0.5%的Nb后，WSe₂晶体在近带边激子跃迁中表现出轻微的蓝移，并表现出强烈增强的光响应性。测量了频率相关光电流和时间分辨光响应，以探索载流子的动力学衰减过程。我们的结果表明，基于掺Nb的WSe₂层状晶体的层状晶体在光探测器件方面具有潜在应用。
