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Abstract
Thin film solar cells are one of the important candidates utilized to reduce the cost of photovoltaic production by minimizing the usage of active materials. However, low light absorption due to low absorption coefficient and/or insufficient active layer thickness can limit the performance of thin film solar cells. Increasing the absorption of light that can be converted into electrical current in thin film solar cells is crucial for enhancing the overall efficiency and in reducing the cost. Therefore, light trapping strategies play a significant role in achieving this goal. The main objectives of light trapping techniques are to decrease incident light reflection, increase the light absorption, and modify the optical response of the device for use in different applications. Nanostructures utilize key sets of approaches to achieve these objectives, including gradual refractive index matching, and coupling incident light into guided modes and localized plasmon resonances, as well as surface plasmon polariton modes. In this review, we discuss some of the recent developments in the design and implementation of nanostructures for light trapping in solar cells. These include the development of solar cells containing photonic and plasmonic nanostructures. The distinct benefits and challenges of these schemes are also explained and discussed.
Highlights
The current world energy generation system is unsustainable, insufficient, cost-ineffective, and environmentally unfriendly
We review some of the recent developments in the design and implementation of nanostructures for light trapping in solar cells
Advanced light trapping techniques are important for the development of thin film solar cells to obtain higher efficiency and lower cost
Summary
The current world energy generation system is unsustainable, insufficient, cost-ineffective, and environmentally unfriendly. Nanophotonic structures with a self-cleaning capability coating the solar cell are becoming necessary for sustainability and improved performance of the solar cells in typical terrestrial environments [15,16,17,18,19,20,21,22] Minimizing optical losses such as reflections from front surfaces, preventing light from entering the solar cell active material, and poor absorption due to the transmission, in thin film solar cells, have long been the main challenge in increasing the conversion efficiency. Light trapping techniques have been utilized in the development of high performance and low-cost solar cells by enhancing light absorption without requiring thicker active layers.
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