由隨溫變化 (15-300 K)光導實驗所得到之雙層角二硒化鎢的吸收譜線研究爾貝賀與陡峭。使用法爾旭半經驗式及愛因斯坦震盪模型分析隨溫變化的能隙，我們估算出杜拜與愛因斯坦溫 分別為 160 K及 125 K。有效聲子能也確地從隨溫變化的光導譜線所得之爾貝賀能估算出並且對應到二硒化鎢曼散射的主動模式 E1g。Urbach’s rule and steepness parameter of 2H-WSe2 layered crystals have been studied via the absorption spectra from the photoconductivity (PC) measurements in the temperature range of 15-300 K. From the analysis of the temperature-dependent band gap with Varshni semi-empirical equation, the Debye temperature was estimated as 160 K while the Einstein temperature is around 125 K from the Einstein oscillator model. The effective phonon energy was estimated successfully from the temperature dependence of the Urbach energy extracted from the PC spectra and the value is found out to be well correlated to the active E1g mode observed in the Raman spectra of 2H-WSe╱sub 2╱.
