Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 46, Pages 54964-54973Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13477
Keywords
perovskite solar cells; sub-bandgap transmission loss; BaF2 crystal; lanthanide; upconversion
Funding
- German Federal Ministry for Economic Affairs and Energy (CAPITANO) [03EE1038B]
- Initiating and Networking funding of the Helmholtz Association (HYIG) [VH-NG1148]
- Materials and Technologies for the Energy Transition Research Program
- RFBR [21-53-12017]
- DFG [TU 487/8-1]
- Helmholtz Association
- Helmholtz Materials Energy Foundry (HEMF)
- Research Field Energy - Program Materials and Technologies for the Energy Transition - Topic 1 Photovoltaics
- Russian Federation
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This study demonstrates that using a fluoride single crystal like BaF2:Yb3+, Er3+ for UC is an effective method to extend the response of perovskite solar cells to near-infrared illumination at 980 nm, resulting in enhanced current at very high incident intensities. Upconverted photons contribute to an increase in short-circuit current density, with a non-linear relationship with the incident intensity of sub-bandgap illumination.
Lanthanide-based upconversion (UC) allows harvesting subbandgap near-infrared photons in photovoltaics. In this work, we investigate UC in perovskite solar cells by implementing UC single crystal BaF2:Yb3+, Er3+ at the rear of the solar cell. Upon illumination with high-intensity sub-bandgap photons at 980 nm, the BaF2:Yb3+, Er3+ crystal emits upconverted photons in the spectral range between 520 and 700 nm. When tested under terrestrial sunlight representing one sun above the perovskite's bandgap and sub-bandgap illumination at 980 nm, upconverted photons contribute a 0.38 mA/cm(2) enhancement in the short-circuit current density at lower intensity. The current enhancement scales non-linearly with the incident intensity of subbandgap illumination, and at higher intensity, 2.09 mA/cm(2) enhancement in current was observed. Hence, our study shows that using a fluoride single crystal like BaF2:Yb3+, Er3+ for UC is a suitable method to extend the response of perovskite solar cells to near-infrared illumination at 980 nm with a subsequent enhancement in current for very high incident intensity.
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