Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
Recently it has been reported that polycrystalline thin films of three-dimensional (3D) organic-inorganic perovskites are closer to possessing “single-crystal-like” optoelectronic properties than has been previously thought [1]. However, reports on the estimated binding energy of excitons in single crystal samples have been recorded to fall within a rather large range [2-4]: 5 - 50 meV for iodide perovskite (CH3NH3PbI3) and 25-76 meV for bromide perovskite (CH3NH3PbBr3). Although most of recent studies have supported the lower values in the range, such estimations were performed using other material parameters. In order to more precisely determine the exciton binding energy, we have measured the photoluminescence excitation(PLE) directly.
We have performed photoluminescence and PLE experiments on single crystal 3D bromide perovskite at low temperature to clarify the binding energy of the lowest level excitons. Additionally, reflection spectra measurements were taken. From the results of PLE measurements we have estimated the exciton binding energy to be about 25meV. This value falls within the range of exciton binding energies which has previously calculated using exciton-exciton scattering (p-emission) measurements (20-40meV) in our previous work [5]. It is worth noting that the binding energy in this experiment was estimated directly from the energy difference in excitonic emissions and no other material properties were used.
In our presentation, we will discuss why previous estimated values were so spread and show several excitonic parameters such as the oscillator strength.
[1] B. Wenger; et al. Nature Communications 2017, 8, 590
[2] A.Miyata; et al. Nat. Phys. 2015, 11, 582−587
[3] K. Galkowski; et al., Energy Environ. Sci. 2016, 9, 962−970
[4] K. Tanaka; et al., Solid State Commun. 2003, 127, 619−623
[5] H. Kunugita; and el al., Jpn. J. Appl. Phys. 2016, 55, 060304
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