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Optimized Graphene-Oxide-Based Interconnecting Layer in All-Perovskite Tandem Solar Cells.
Melissa R Fitzsimmons1, Bart Roose1, Yutong Han1
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, United Kingdom.
Researchers developed a new interconnecting layer for all-perovskite tandem solar cells, replacing conventional materials with graphene oxide and a self-assembled monolayer. This innovation boosts power conversion efficiency and stability in next-generation photovoltaic devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- All-perovskite tandem solar cells offer higher efficiencies than single-junction cells.
- A key challenge is the interconnecting layer, often using gold and PEDOT:PSS, which causes losses and instability.
Purpose of the Study:
- To develop a novel interconnecting layer for all-perovskite tandem solar cells.
- To improve device efficiency and stability by addressing limitations of conventional interconnecting layers.
Main Methods:
- Replaced ultrathin metal and PEDOT:PSS with a graphene-oxide recombination layer.
- Integrated the graphene-oxide layer with a self-assembled monolayer (2PACz).
- Fabricated and characterized the monolithic all-perovskite tandem solar cells.
Main Results:
- Achieved a champion device efficiency of 23.4%, a significant increase from the conventional 19.7%.
- Demonstrated reduced optical and nonradiative losses.
- Showcased improved operational stability compared to devices with traditional interconnecting layers.
Conclusions:
- The novel graphene-oxide based interconnecting layer effectively solves a critical challenge in all-perovskite tandem solar cell design.
- This advancement paves the way for more efficient and stable perovskite solar cell technologies.
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