期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 3, 页码 601-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b03728
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资金
- Helmholtz Energy Alliance Hybrid Photovoltaics
- Joint Graduate School HyPerCells of the University of Potsdam
- Helmholtz Zentrum Berlin
- DFG [SFB951, AM 419/1-1]
- 111 Project of the Chinese State Administration of Foreign Experts Affairs
- Collaborative Innovation Center of Suzhou Nano Science AMP
- Technology (NANO CIC)
- Sustainability and Energy Research Initiative (SAERI) at the Weizmann Institute
- Minerva Foundation
- Alexander von Humboldt Foundation
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.
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