Rare earth doped perovskites for efficient solar spectrum down-conversion

Darayas N. Patel; Sergey S. Sarkisov; Abdalla M. Darwish; Mike Warren Jr.; Jessica Ambroise; Wilbert Mays; Aaren Harewood; Robert Henley

doi:10.1117/12.2605385

4 March 2022 Rare earth doped perovskites for efficient solar spectrum down-conversion

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Mike Warren Jr., Jessica Ambroise, Wilbert Mays, Aaren Harewood, Robert Henley

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Proceedings Volume 11997, Optical Components and Materials XIX; 1199706 (2022) https://doi.org/10.1117/12.2605385
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Perovskites doped with rare earth (RE) ions can be used to convert efficiently UV component of solar radiation spectrum in the near-infrared (NIR) radiation suitable for generating electricity in conventional silicon-based photovoltaic (PV) cells. These materials have good ability to capture the energy of the incident UV photons and transfer it to the embedded RE ions, such as Yb³⁺ emitting NIR photons. In this paper we explored two methods of synthesis of down-converting REdoped metal halide perovskites CsPbCl_xBr_1-x: Yb³⁺: the hot injection method of making nanoparticles (NP) and the two-stage spin-casting fabrication of the nano-films. The hot-injection method resulted in the NP with an average size varying from 4 to 120 nm. The XRD spectroscopy revealed that the synthesized NP had the crystalline structure like orthorhombic bulk crystal of CsPbBr3. The PL spectrum of the Yb³⁺ perovskite NP revealed the NIR PL peak at 980 nm attributed to the relaxation of the excited ion of Yb³⁺ and indicating that the process of spectral down-converting (quantum cutting) took place. Besides well-known dependence of the color of visible PL on the composition of the perovskite CsPbX3 (blue for X = Br, yellow – X = Cl, and red – X = I), we showed that the wavelength of the visible PL peak increases with the average size of the NP of CsPbCl_1.5Br_1.5. The nano-films of CsPbCl_xBr_1-x: Yb³⁺ prepared by the spin-casting method demonstrated visible PL of blue-green color. The obtained results might be of significance to the applications related to the efficient solar power and green power technology.

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Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Mike Warren Jr., Jessica Ambroise, Wilbert Mays, Aaren Harewood, and Robert Henley "Rare earth doped perovskites for efficient solar spectrum down-conversion", Proc. SPIE 11997, Optical Components and Materials XIX, 1199706 (4 March 2022); https://doi.org/10.1117/12.2605385

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