Journal
ACS PHOTONICS
Volume 3, Issue 6, Pages 1060-1068Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00139
Keywords
solar cell; photovoltaic; Franz-Keldysh effect; Wannier exciton; Stark effect; electric-field ionization
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Funding
- State of Washington through the University of Washington Clean Energy Institute (UW CET)
- Office of Naval Research [ONR N00014-14-1-0170]
- UW CEI Graduate Fellowship Program
- University of Washington
- Molecular Engineering & Sciences Institute
- Clean Energy Institute
- National Science Foundation
- National Institutes of Health
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We use electroabsorption (EA) spectroscopy to measure the exciton binding energy (E-B), electron hole reduced effective mass (mu), and one-electron band gap (E-g) 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 mu = 0.12 +/- 0.03m(0), E-B = 7.4 meV, and E-g = 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.
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