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The conduction band structure in methylammonium lead iodide (CH3NH3PbI3) wasstudied both by angle-resolved two-photon photoemission spectroscopy (AR-2PPE)with low-photon intensity and angle-resolved low-energy inverse photoelectronspectroscopy (AR-LEIPS). Clear energy dispersion of the conduction band alongthe {\Gamma}M direction was observed by these independent methods underdifferent temperatures, and the dispersion was found to be consistent with bandcalculations under the cubic phase. The effective mass of the electrons at the{\Gamma} point was estimated to be (0.20+-0.05)m0 at 90 K. The observed energyposition was largely different between the AR-LEIPS and AR-2PPE, demonstratingthe electron correlation effects on the band structures. The present resultsalso indicate that the surface structure in CH3NH3PbI3 provides thecubic-dominated electronic property even at lower temperatures.

Accessing the conduction band dispersion in CH3NH3PbI3 single crystals