Enhancing near-infrared solar cell response using up-conversion materials over bare CsPbBr3
All-inorganic halide perovskites have emerged as promising materials in the application of optoelectronic devices. Cubic CsPbI3 has the narrowest band gap of 1.73 eV among all-inorganic lead halide perovskites, but it is only stable at high temperatures. A stable alternative is the orthorhombic CsPbBr3 perovskite, which unfortunately has a higher bandgap (2.3 eV). A strategy to achieve a lower band gap is the design of up-conversion bromide perovskites using lanthanides as dopants. We have succeeded in the preparation, by mechano-synthesis, of several members of the family of perovskites Cs1-xPb1-x(Yb,Tb)xBr3. Yb3+ has been selected as the sensitizer ion and Tb3+ as the activator ion. We aim to investigate the crystal structure features at RT, including the evolution of the tilting of the octahedra with rare-earth doping, and the accommodation of Cs vacancies and the structural evolution above room temperature, taking into account that the parent CsPbBr3 perovskite undergoes a phase transition from orthorhombic to tetragonal at 88ºC and then to cubic at 130ºC.
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Consuelo Alvarez-Galvan; ABIA SANZ Carmen; ALONSO Jose Antonio and FERNANDEZ DIAZ Maria Teresa. (2020). Enhancing near-infrared solar cell response using up-conversion materials over bare CsPbBr3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-21-1133
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