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Bifacial all-perovskite tandem solar cells
Bo Chen1, Zhenhua Yu1, Arthur Onno2
1Department of Applied Physical Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Bifacial all-perovskite tandem solar cells achieve 29.3% efficiency by minimizing voltage loss and enhancing light absorption. This breakthrough improves energy yield and device stability for perovskite solar technology.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- All-perovskite tandem solar cells currently underperform compared to theoretical efficiency limits.
- A key limitation is the inability of wider bandgaps to significantly increase open-circuit voltage, hindering overall performance.
Purpose of the Study:
- To develop efficient bifacial all-perovskite tandem solar cells.
- To address the open-circuit voltage deficit and enhance light absorption in perovskite devices.
- To improve the stability of lead-tin (Pb-Sn) perovskite solar cells.
Main Methods:
- Fabrication of bifacial all-perovskite tandem structures.
- Incorporation of a light-scattering micrometer-sized particle layer to enhance infrared light absorption.
- Utilizing a nonacidic hole transport layer to stabilize the hole-extraction interface.
Main Results:
- Achieved an equivalent efficiency of 29.3% for bifacial devices under a back-to-front irradiance ratio of 30.
- Increased absorptance by 5-15% in the infrared region due to light-scattering particles.
- Enhanced the efficiency of semitransparent Pb-Sn cells from 15.6% to 19.4%.
Conclusions:
- Bifacial design and light-trapping strategies significantly boost perovskite tandem solar cell efficiency and energy yield.
- The use of a nonacidic hole transport layer improves device stability.
- These advancements pave the way for highly efficient and stable bifacial all-perovskite tandem solar devices.
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