Electroabsorption Spectroscopy Measurements of the Exciton Binding Energy, ElectronHole Reduced Effective Mass, and Band Gap in the Perovskite CH<sub3>NH<sub3>PbI<sub3>
Abstract
We use electroabsorption (EA) spectroscopy to measure the exciton binding energy (E<sub>B), electronhole reduced effective mass (), and one-electron band gap (Eg) at the fundamental absorption edge of the hybrid organicinorganic perovskite CH<sub>3NH<sub>3PbI<sub>3 in its tetragonal phase at 300 K. By studying the second-harmonic EA spectra at the fundamental absorption edge we establish that the room temperature EA response in CH<sub>3NH<sub>3PbI<sub>3 follows the low-field FranzKeldyshAspnes (FKA) effect. Following FKA analysis we find that = 0.12 0.03m<sub>0, E<sub>B = 7.4 meV, and E<sub>g = 1.633 eV. Our results provide direct experimental evidence that at room temperature primary transitions occurring in CH<sub>3NH<sub>3PbI<sub>3 can essentially be described in terms of free carrier generation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 28, 2016
- Accession Number
- AD1010020
Entities
People
- David Ginger
- Joseph C. Mohammed
- Mark E Ziffer
Organizations
- University of Washington