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Illumination Angle Insensitive Single Indium Phosphide Tapered Nanopillar Solar Cell
Wai Son Ko1, Thai-Truong D Tran1, Indrasen Bhattacharya1
1†Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
Nano Letters
|June 18, 2015
Summary
High-efficiency, low-cost solar energy adoption is advanced by novel indium phosphide nanopillar photovoltaics. These devices show angle-insensitive response and 19.6% power conversion efficiency due to a unique p-i-n junction design.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Accelerating solar energy adoption requires low-cost, high-efficiency photovoltaic technologies.
- Indium phosphide (InP) nanopillars offer potential for advanced solar cell applications.
Purpose of the Study:
- To demonstrate a single nanopillar photovoltaic device with an angle-insensitive response.
- To improve photovoltaic device performance using a novel core-shell p-i-n junction.
Main Methods:
- Growth of tapered indium phosphide nanopillars on a silicon substrate.
- Fabrication of a regrown core-shell p-i-n junction within the nanopillars.
- Characterization of photovoltaic performance, including open-circuit voltage (VOC) and power conversion efficiency (PCE).
- Measurement of light absorption across a broad spectral range.
Main Results:
- Demonstration of a single nanopillar photovoltaic with angle-insensitive illumination response.
- Achieved a high open-circuit voltage (VOC) of 0.534 V.
- Attained a power conversion efficiency (PCE) of 19.6%.
- Observed enhanced broadband light absorption from 400-800 nm.
Conclusions:
- The novel regrown core-shell p-i-n junction effectively eliminates shunt current paths, significantly boosting device performance.
- The developed indium phosphide nanopillar photovoltaic demonstrates high efficiency and stable response under varying light angles, paving the way for cost-effective solar energy solutions.
