Ha, D.
, Yoon, Y.
and Zhitenev, N.
(2018),
Nanoscale imaging of photocurrent enhancement by resonator array photovoltaic coatings, Nanotechnology, [online], https://doi.org/10.1088/1361-6528/aaab0c
(Accessed December 8, 2024)
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Nanoscale imaging of photocurrent enhancement by resonator array photovoltaic coatings
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Abstract
Nanoscale surface patterning commonly used to increase absorption of solar cells can adversely impact the open-circuit voltage due to increased surface area and recombination. Here, we demonstrate absorptivity and photocurrent enhancement using silicon dioxide (SiO2) nanosphere arrays on a gallium arsenide (GaAs) solar cell that do not require direct surface texturing. Due to the combined effects of thin-film interference and whispering gallery-like resonances within nanosphere arrays, there is more than 20% enhancement in absorptivity and photocurrent. To determine the effect of the resonance coupling between nanospheres, we perform a scanning photocurrent microscopy (SPCM) based on a near-field scanning optical microscopy (NSOM) measurement and find a substantial local photocurrent enhancement. The demonstrated antireflection coating (ARC), made by the Meyer rod rolling technique that is a scalable and a room-temperature fabrication process, can replace the conventional thin-film-based ARCs requiring expensive high-temperature vacuum deposition.Citation
Nanotechnology
Volume
29
Issue
14
Pub Type
Journals
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Created February 15, 2018, Updated November 10, 2018