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Nanoscale imaging of photocurrent enhancement by resonator array photovoltaic coatings



Dongheon Ha, Yohan Yoon, Nikolai B. Zhitenev


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.


Ha, D. , Yoon, Y. and Zhitenev, N. (2018), Nanoscale imaging of photocurrent enhancement by resonator array photovoltaic coatings, Nanotechnology, [online], (Accessed June 20, 2024)


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Created February 15, 2018, Updated November 10, 2018