Nanoscale imaging of photocurrent enhancement by resonator array photovoltaic coatings.

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 patterning. Due to the combined effects of thin-film interference and whispering gallery-like resonances within nanosphere arrays, there is more than 20% enhancement in both absorptivity and photocurrent. To determine the effect of the resonance coupling between nanospheres, we perform a scanning photocurrent microscopy based on a near-field scanning optical microscopy measurement and find a substantial local photocurrent en

SUBMITTER: Ha D 

PROVIDER: S-EPMC6128288 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature