Work

Electroabsorption Spectroscopy Measurements of the Exciton Binding Energy, Electron–Hole Reduced Effective Mass, and Band Gap in the Perovskite CH3NH3PbI3

Year: 2016

Type: article

Abstract: We use electroabsorption (EA) spectroscopy to measure the exciton binding energy (EB), electron–hole reduced effective mass (μ), and one-electron band gap (Eg) at the fundamental absorption edge of the hybrid organic–inorganic perovskite CH3NH3PbI3 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 CH3NH3PbI3 follows the low-field Franz–Keldysh–Aspnes (FKA) effect. Following FKA analysis we find that μ = 0.12 ± 0.03m0, EB = 7.4 meV, and Eg = 1.633 eV. Our results provide direct experimental evidence that at room temperature primary transitions occurring in CH3NH3PbI3 can essentially be described in terms of free carrier generation.

Source: ACS Photonics

DOI: 10.1021/acsphotonics.6b00139

Authors: Mark E. Ziffer, Joseph C. Mohammed, David S. Ginger

Institution: University of Washington

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funders: Clean Energy Institute, Office of Naval Research