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Enhanced photon absorption in spiral nanostructured solar cells using layered 2D materials
Mohammad H Tahersima1, Volker J Sorger
1Department of Electrical and Computer Engineering, The George Washington University, Washington, DC 20052, USA.
Nanotechnology
|August 4, 2015
Summary
Researchers developed a novel spiral solar cell using rolled two-dimensional (2D) materials like molybdenum disulfide. This design significantly boosts light absorption up to 90%, overcoming efficiency limitations of traditional 2D photovoltaic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Two-dimensional (2D) transition metal dichalcogenides exhibit strong light absorption due to their high density of states.
- Stacking various 2D materials (metallic, insulating, semiconducting) allows for atomically thin functional devices.
- Current 2D material-based photovoltaic cells suffer from low light absorption (a few percent) and efficiency due to sub-wavelength thickness.
Purpose of the Study:
- To enhance light absorption in 2D material-based solar cells by utilizing their mechanical flexibility.
- To demonstrate a novel spiral solar cell architecture for improved solar energy conversion.
- To investigate the optical absorption properties of rolled molybdenum disulfide/graphene/hexagonal boron nitride heterostructures.
Main Methods:
- Fabrication of a spiral solar cell by rolling a molybdenum disulfide (MoS2)/graphene (Gr)/hexagonal boron nitride (h-BN) heterostructure.
- Optical absorption measurements of the spiral cell and comparison with planar MoS2 cells.
- Investigation of core-shell structures for further absorption enhancement.
Main Results:
- The spiral solar cell achieved optical absorption up to 90%, a significant improvement over planar designs.
- A 1 μm long spiral cell showed ~50% stronger absorption than a planar MoS2 cell of the same thickness, despite a 6% volumetric ratio.
- Core-shell structures demonstrated enhanced absorption and pronounced absorption peaks compared to spiral structures without metallic contacts.
Conclusions:
- Rolling 2D materials into a spiral configuration effectively enhances light absorption for solar energy applications.
- The proposed spiral and core-shell architectures offer a pathway to overcome efficiency limitations in 2D material-based photovoltaics.
- These findings provide guidance for designing advanced photonic structures leveraging 2D materials for efficient solar energy conversion.
