论文标题
访问CH3NH3PBI3单晶中的传导带分散
Accessing the conduction band dispersion in CH3NH3PbI3 single crystals
论文作者
论文摘要
通过角度分辨的两光子光发射光谱（AR-2PPE）研究了碘化甲基丙年酰胺铅（CH3NH3PBI3）中的传导带结构，具有低光强度和低能性分辨率的低能性非能量非能量非光电电源光谱（AR-LE-LE-LELEPS）。在不同温度下，这些独立方法观察到了沿γm方向的传统沿γm方向的清晰能量分散，发现分散与立方相下的带计算一致。据估计，γ点的电子的有效质量为90 K处的电子为（0.20+-0.05）M0。观察到的能量位置在AR-Leips和AR-2ppe之间大大差异，表明电子对条带结构的电子相关效应。目前的结果还表明，即使在较低的温度下，CH3NH3PBI3中的表面结构也提供了以立方为主的电子特性。
The conduction band structure in methylammonium lead iodide (CH3NH3PbI3) was studied both by angle-resolved two-photon photoemission spectroscopy (AR-2PPE) with low-photon intensity and angle-resolved low-energy inverse photoelectron spectroscopy (AR-LEIPS). Clear energy dispersion of the conduction band along the ΓM direction was observed by these independent methods under different temperatures, and the dispersion was found to be consistent with band calculations under the cubic phase. The effective mass of the electrons at the Γ point was estimated to be (0.20+-0.05)m0 at 90 K. The observed energy position was largely different between the AR-LEIPS and AR-2PPE, demonstrating the electron correlation effects on the band structures. The present results also indicate that the surface structure in CH3NH3PbI3 provides the cubic-dominated electronic property even at lower temperatures.
