× close
Short wavelength absorption of Er3+ NaY(WO)Four)2. NaY (excitation spectrum of WO)Four)2:Eh3+ Doped with different Er3+ Measure the concentration by monitoring the emission at 552 nm. credit: Light: Science and Applications (2024). DOI: 10.1038/s41377-023-01365-2
Introducing photoconversion materials into silicon-based photovoltaic devices is an effective way to improve photovoltaic conversion efficiency. Light conversion materials include quantum cutting materials and upconversion materials.
The purpose of introducing quantum cutting materials is to split a short wavelength photon into two or more photons that can participate in photoelectric conversion in silicon-based photovoltaic devices. The introduction of upconversion materials is done to combine two or more infrared photons into one photon and can also be used for photoelectric conversion in silicon-based photovoltaic devices.
By introducing photoconversion materials, it is possible to improve photoelectric conversion efficiency without changing the performance of silicon solar cells themselves. This method can significantly reduce the technical difficulties of improving the efficiency of silicon-based photovoltaic systems. Additionally, silicon-based photovoltaic devices are exposed to sunlight and must be temperature-controlled. To control this temperature, it is necessary to measure the temperature in advance.
However, simultaneously introducing three materials that can independently achieve quantum cut, upconversion, and temperature sensing into a silicon-based solar cell may complicate the structural design of the solar cell and unnecessarily increase product cost. . Therefore, the challenge is to discover and develop highly functional materials that combine the above three functions.
in a new paper published in Light: Science and ApplicationsResearchers from Dalian Maritime University’s School of Science have achieved highly efficient light splitting, near-pure infrared upconversion emission, and suitable temperature sensing for thermal management in silicon-based solar cells by adjusting the doping concentration of Er. reported that it has been achieved.3+ and Yb3+ NaY(WO)Four)2 phosphor.
This study reveals that this all-in-one material is an excellent candidate for application in silicon-based solar cells to improve photovoltaic conversion efficiency and enhance thermal management.
A deep understanding of the quantum cutting mechanism is important for the design and evaluation of quantum cutting materials. However, quantum cutting processes are often complex. In this study, the authors carefully deciphered the photo segmentation step of Er.3+/Yb3+ Co-doped NaY(WOFour)2 Supports doping concentration dependent spectroscopy and fluorescence dynamics.
“Based on optical spectroscopy, a quantum cutting mechanism was discovered, and the photon splitting process involves a two-step energy transfer process,” the research team said. FourS3/2+2F7/2 FourI11/2 +2F5/2 and FourI11/2 + 2F7/2 FourIFebruary 15th + 2F5/2. ”
Quantum cutting efficiency can be confirmed experimentally and theoretically. In the ideal case, the measured quantum cutting efficiency is also defined as the internal quantum efficiency, but this differs from the traditional definition of internal quantum efficiency. Quantum efficiency measurement techniques are still unsatisfactory because too many uncontrollable factors complicate the measurement results.
For more information:
Duan Gao et al., Near-infrared radiation from both high-efficiency quantum cutting (173%) and near-pure upconversion in NaY(WO4)2:Er3+/Yb3+ with thermal management capabilities in silicon-based solar cells, Light: Science and Applications (2024). DOI: 10.1038/s41377-023-01365-2