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Sandra F. H. Correia, Ana R. N. Bastos, Lianshe Fu, et al. Lanthanide-based downshifting layers tested in a solar car race. Opto‐Electron Adv 2, 190006 (2019). doi: 10.29026/oea.2019.190006
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Original Article Open Access
Lanthanide-based downshifting layers tested in a solar car race
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Abstract
The mismatch between the AM1.5G spectrum and the photovoltaic (PV) cells absorption is one of the most limiting factors for PV performance. To overcome this constraint through the enhancement of solar energy harvesting, luminescent downshifting (LDS) layers are very promising to shape the incident sunlight and, thus, we report here the use of Tb3+- and Eu3+-doped organic-inorganic hybrid materials as LDS layers on Si PV cells. Electrical measurements on the PV cell, done before and after the deposition of the LDS layers, confirm the positive effect of the coatings on the cell's performance in the UV spectral region. The maximum delivered power and the maximum absolute external quantum efficiency increased 14% and 27%, respectively. Moreover, a solar powered car race was organized in which the small vehicle containing the coated PV cells presented a relative increase of 9% in the velocity, when compared to that with the uncoated one.-
Keywords:
- photovoltaics /
- downshifting layers /
- solar car /
- organic-inorganic hybrids /
- lanthanide ions
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References
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Sandra F. H. Correia, Ana R. N. Bastos, Lianshe Fu, et al. Lanthanide-based downshifting layers tested in a solar car race. Opto‐Electron Adv 2, 190006 (2019). doi: 10.29026/oea.2019.190006
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- Figure 1. Photographs of the (a, d) bare PV devices and of the coated (b, c) PV-1 and (e, f) PV-2 with the (b, e) dU6-Tb and (c, f) tU5-Eu LDS layers, under UV radiation at 365 nm.
- Figure 2. (a) Excitation spectra (dashed lines) monitored at 543 nm and 615 nm for dU6-Tb (green line) and tU5-Eu (red line), respectively, and emission spectra (solid lines) excited at 315 nm for dU6-Tb (green line), and 365 nm for tU5-Eu (red line); (b) Absorption spectra of dU6-Tb and tU5-Eu and AM1.5G photon flux (right y axis). The shadowed areas represent the overlap integral, Eq. (3), with the same colour code as the excitation and emission spectra.
- Figure 3. Total (solid lines) and diffuse (dashed lines) reflectance of (a) PV-1 and (b) PV-2 with dU6-Tb (green lines) and tU5-Eu (red lines) coatings compared with the average reflectance curve measured for distinct bare PV devices (black lines).
- Figure 4. EQE curves of (a) PV-1 and (b) PV-2 with dU6-Tb (green dotted lines) and tU5-Eu (red solid lines) coatings compared with the correspondent bare PV devices (black lines).
- Figure 5. V-P curves of (a) PV-1 and (b) PV-2 with dU6-Tb (green dotted lines) and tU5-Eu (red solid lines) coatings compared with the correspondent bare PV devices (black lines).
- Figure 6. Scheme of the solar vehicle with (a) bare PV-2 and (b) PV-2 with the LDS coating and (c) photographs of the solar vehicles race. The solar vehicle with the coated PV cell is indicated by the red circle.
