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Investigations of up and down conversion of energy in glass and glass ceramics of rare earth ions doped tellurite for solar cell applications

Grant number: 15/10713-0
Support Opportunities:Scholarships in Brazil - Post-Doctoral
Effective date (Start): October 01, 2015
Effective date (End): July 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Andrea Simone Stucchi de Camargo Alvarez Bernardez
Grantee:Rajesh Dagupati
Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass, AP.CEPID


Photovoltaic (PV) technologies for solar energy conversion represent promising routes to green and renewable energy generation. Despite the fact that relevant PV technologies have being available for more than half a century, the production of solar energy remains costly, largely owing to low power conversion efficiencies of solar cells. The main difficulty in improving the efficiency of PV energy conversion lies in the spectral mismatch between the energy distribution of photons in the incident solar spectrum and the bandgap of a semiconductor material. With the aim of utilizing the infrared region of solar radiation to improve solar cell performance progress has been sought in the field of up & down-conversion for photovoltaic applications. In recent years, luminescent materials, which are capable of converting a broad spectrum of light into photons of a particular wavelength, have been synthesized and used to minimize the losses in the solar-cell-based energy conversion process. In this scenario, we will push recent progress in the development of spectral converters, with a particular emphasis on lanthanide-based upconversion, quantum cutting and down-shifting materials, for PV applications. Particularly, we propose to study the up & down-conversion characteristics of tellurite and germanate based glasses doped with rare earth ions, prepared using the conventional melt quenching technique. These glass matrices will be characterized systematically from their structural (XRD, SEM-EDAX), chemical (FTIR, RAMAN), thermal (TG/DTA/DSC) and spectroscopic (Optical absorption, PLE, PL, excited state lifetime measurements) points of view, besides performing measurements of solar cell quantum efficiency. By using thermal analysis techniques such as TG- DTA and DSC, characteristic temperatures Tg, Tc and Tm will be determined. The glasses will be annealed at suitable temperatures to obtain glass-ceramics. XRD, SEM, TEM, FTIR and Raman studies will be used to investigate the size of the particles and the molecular bonds present in the glass and glass-ceramics. Spectroscopic techniques such as optical absorption, photoluminescence and decay curves will be employed to investigate the excited state dynamics in rare earth doped glass and glass-ceramics. Finally, the obtained results will be correlated and used to optimize the rare earth ions doped glass and glass-ceramics for solar cell applications.

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RAJESH, DAGUPATI; DOUSTI, M. REZA; AMJAD, RAJA J.; DE CAMARGO, A. S. S.. Enhancement of down- and upconversion intensities in Er3+/Yb3+ co-doped oxyfluoro tellurite glasses induced by Ag species and nanoparticles. Journal of Luminescence, v. 192, p. 250-255, . (15/10713-0, 13/07793-6)
RAJESH, DAGUPATI; AMJAD, RAJA J.; REZA DOUSTI, M.; DE CAMARGO, A. S. S.. Enhanced VIS and NIR emissions of Pr3+ ions in TZYN glasses containing silver ions and nanoparticles. Journal of Alloys and Compounds, v. 695, p. 607-612, . (15/10713-0, 13/07793-6, 15/08434-5)
RAJESH, D.; DOUSTI, M. REZA; AMJAD, RAJA J.; DE CAMARGO, A. S. S.. Quantum cutting and up-conversion investigations in Pr3+/Yb3+ co-doped oxyfluoro-tellurite glasses. Journal of Non-Crystalline Solids, v. 450, p. 149-155, . (15/10713-0, 15/08434-5, 13/07793-6)
RAJESH, DAGUPATI; DE CAMARGO, A. S. S.. Nd3+ doped new oxyfluoro tellurite glasses and glass ceramics containing NaYF4 nano crystals-1.06 mu m emission analysis. Journal of Luminescence, v. 207, p. 469-476, . (15/10713-0, 13/07793-6)

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