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| Azevedo, Nuno Monteiro |
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Duong, The
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2022Impact of Halide Anions in CsX (X = I, Br, Cl) on the Microstructure and Photovoltaic Performance of FAPbI3-Based Perovskite Solar Cellscitations
- 2022Direct solar to hydrogen conversion enabled by silicon photocathodes with carrier selective passivated contactscitations
- 2021Unraveling the influence of CsCl/MACl on the formation of nanotwins, stacking faults and cubic supercell structure in FA-based perovskite solar cellscitations
- 2021Direct Solar Hydrogen Generation at 20% Efficiency Using Low-Cost Materialscitations
- 2020Over 17% Efficiency Stand-Alone Solar Water Splitting Enabled by Perovskite-Silicon Tandem Absorberscitations
- 2018Metal halide perovskitecitations
- 2018The Interaction of Ion Migration with Shockley-Read-Hall Recombination in the Bulk of Perovskite Solar Cells Explains Anomalous Voltage and Luminescence Transientscitations
- 2017Light and Electrically Induced Phase Segregation and Its Impact on the Stability of Quadruple Cation High Bandgap Perovskite Solar Cellscitations
- 2017Rubidium Multication Perovskite with Optimized Bandgap for Perovskite-Silicon Tandem with over 26% Efficiencycitations
- 2017Inverted Hysteresis in CH3NH3PbI3 Solar Cellscitations
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article
Impact of Halide Anions in CsX (X = I, Br, Cl) on the Microstructure and Photovoltaic Performance of FAPbI3-Based Perovskite Solar Cells
Abstract
<p>The key role of Cs cation and X halide anions (X = I, Br, Cl) on the microstructure, crystal structure, structural defects, optoelectronic properties, and photovoltaic parameters of FAPbI<sub>3</sub>-based perovskite solar cells is investigated. The CsCl–FAPbI<sub>3</sub> perovskite film shows the highest photoluminescence (PL) intensity, longest PL lifetime, and highest power conversion efficiency compared with the CsI–FAPbI<sub>3</sub> and CsBr–FAPbI<sub>3</sub> perovskite films. The morphology and crystallography of (Formula presented.) <sub>c</sub> nanotwins and stacking faults of perovskite films are studied using transmission electron microscopy and selected-area electron diffraction. The microstructure, crystallography, and atomic structure model of intersecting twin boundaries are presented. Finally, the degradation pathways and the mechanism behind the formation of FAPbI<sub>3</sub>-based perovskites under ambient conditions are systematically studied. The grain boundaries of the perovskite films are nonuniformly damaged, resulting in many black nanoparticles after 4 weeks. Electron diffraction analyses of the black nanoparticles confirm the hexagonal PbI<sub>2</sub> phase formation in all CsX–FAPbI<sub>3</sub> perovskite samples after 4 weeks of aging.</p>