Electroabsorption Studies of Multicolored Lead Halide Perovskite Nanocrystalline Solid Films

Kamlesh Awasthi, Kai Bo Du, Chi Yung Wang, Chao Lin Tsai, Morihiko Hamada, Sudhakar Narra, Wei-Guang Diau*, Nobuhiro Ohta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Electroabsorption (E-A) spectra of lead halide perovskites, that is, CH3NH3PbI3-xBrx (x = 0-3), which show large spectral shift depending on the ratio between iodine and bromide, have been measured. By analyzing E-A spectra with the integral method, spectral shape of the absorption spectra for the first exciton band and binding energy of exciton have been determined. Magnitudes of the change in electric dipole moment and molecular polarizability following excitation into the exciton state have been also evaluated in these perovskites. The binding energy of electron and hole in exciton of these materials as well as the magnitude of change in electric dipole moment following exciton absorption is roughly the same, suggesting that the difference of the photoenergy conversion in photovoltaic cells using these materials comes from the difference in light harvesting effect and difference in carrier mobility, not from the difference in carrier generation efficiency. The frequency-dependent third-order nonlinear susceptibility ξ(3) has also been calculated, based on the E-A spectra.

Original languageEnglish
Pages (from-to)2408-2417
Number of pages10
JournalACS Photonics
Issue number6
StatePublished - 20 Jun 2018


  • electric dipole moment
  • electroabsorption
  • lead halide perovskite
  • nonlinear susceptibility
  • photovoltaic cell


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