KEYWORDS: Photovoltaics, Solar energy, Solar cells, Multijunction solar cells, Energy efficiency, Standards development, Silver, Silicon solar cells, Silicon, Renewable energy
We present a critical review on optical research in photovoltaics guided by the question: Which topics do we regard as most relevant to accelerate the large-scale implementation of photovoltaics? The following areas were identified: 1) The development of high-performance earth-abundant solar cell materials and the reduction of indium and silver in the device. 2) Color concepts for an appealing optical appearance of solar modules as photovoltaic modules enter urban environments as well as agricultural areas on a large scale. 3) Optical optimization of multijunction solar cells based on perovskite, III-V semiconductors and silicon to overcome the single-junction efficiency limit. 4) Accurate energy yield predictions considering the full complex illumination conditions particularly regarding bifacial and multijunction solar cells. 5) Advanced concepts with strong momentum such as radiative cooling and spectral conversion.
Nanostructures play an important role in state-of-the-art photovoltaic devices. Optical and electrical characteristics of the devices can be improved with properly designed and fabricated nanotextures. In this contribution, we highlight examples of possible fabrication of nanotextures by using UV nanoimprinted lithography, their optical characterization by camera based angular resolved spectroscopy and perform computer-assisted design of nanotextures for best optical performance of heterojunction silicon and ultra-thin chalcopyrite solar cells.
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