Zu, Fengshuo and Amsalem, Patrick and Egger, David A. and Wang, Rongbin and Wolff, Christian M. and Fang, Honghua and Loi, Maria Antonietta and Neher, Dieter and Kronik, Leeor and Duhm, Steffen and Koch, Norbert (2019) Constructing the Electronic Structure of CH3NH3PbI3 and CH3NH3PbBr3 Perovskite Thin Films from Single-Crystal Band Structure Measurements. JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 10 (3). pp. 601-609. ISSN 1948-7185,
Full text not available from this repository. (Request a copy)Abstract
Photovoltaic cells based on halide perovskites, possessing remarkably high power conversion efficiencies have been reported. To push the development of such devices further, a comprehensive and reliable understanding of their electronic properties is essential but presently not available. To provide a solid foundation for understanding the electronic properties of polycrystalline thin films, we employ single-crystal band structure data from angle-resolved photoemission measurements. For two prototypical perovskites (CH3NH3PbBr3 and CH3NH3PbI3), we reveal the band dispersion in two high-symmetry directions and identify the global valence band maxima. With these benchmark data, we construct "standard" photoemission spectra from polycrystalline thin film samples and resolve challenges discussed in the literature for determining the valence band onset with high reliability. Within the framework laid out here, the consistency of relating the energy level alignment in perovskite-based photovoltaic and optoelectronic devices with their functional parameters is substantially enhanced.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | METAL-HALIDE PEROVSKITES; ENERGY-LEVEL ALIGNMENT; SOLAR-CELLS; LEAD IODIDE; PHOTOEMISSION; 1ST-PRINCIPLES; MOBILITIES; EFFICIENT; VALENCE; BR; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group David Egger |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Apr 2020 11:37 |
| Last Modified: | 17 Apr 2020 11:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27560 |
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