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Design principles for single standing nanowire solar cells: going beyond the planar efficiency limits
Yang Zeng1, Qinghao Ye1, Wenzhong Shen1
1Institute of Solar Energy, and Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Scientific Reports
|May 10, 2014
Summary
Standing semiconductor nanowires (NWs) can surpass traditional solar cell limits. Optimizing NWs as dielectric resonator antennas with a back-reflector enhances light absorption and boosts conversion efficiency.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Semiconductor nanowires (NWs) are utilized in photovoltaics, but planar devices face fundamental efficiency limits.
- Standing NWs offer potential to exceed these limits through unique optical properties.
Purpose of the Study:
- To provide a theoretical guideline for maximizing conversion efficiency in single standing NW solar cells.
- To analyze the optical absorption mechanism of standing NWs for enhanced performance.
Main Methods:
- Investigated the optical absorption mechanism of standing NWs under normal incidence.
- Modeled NWs as dielectric resonator antennas, focusing on the HE11δ mode and back-reflector interaction.
- Determined optimal NW radius for supporting the HE11δ mode within the absorption spectrum.
Main Results:
- Standing NWs act as dielectric resonator antennas, maximizing optical cross-section with the HE11δ mode and a back-reflector.
- Efficiency enhancement is due to built-in light concentration and altered absorption front.
- Demonstrated a 33% relative conversion-efficiency enhancement over planar cells using optimal a-Si NWs.
Conclusions:
- Standing NWs offer a pathway to surpass planar solar cell efficiency limits.
- Optimal design involves exciting the HE11δ mode and utilizing a back-reflector.
- This research provides a foundation for designing advanced NW-based solar cells.
