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TiO2 Circular Nano-Gratings as Anti-Reflective Coatings and Potential Color Filters for Efficient Organic Solar Cells

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In the past few years, several studies on organic solar cells have demonstrated their great advantages, such as light weight, flexibility, ease of fabrication, and cost effectiveness. Nevertheless, the low efficiency of these cells for feasible applications is still an issue to be addressed while designing these devices. Anti-reflection structures have been employed to achieve highly efficient light trapping over a broad wavelength range. In this work, an efficient anti-reflective coating has been designed for broadband performance enhancement of organic solar cells and improving the photocurrent density. Thereby, TiO2 circular nano-gratings using staircase-like layers have been proposed which can be fabricated by means of a cheap nano-imprinting technique. Meanwhile, some pass-band filtering characteristics in the visible region have also been obtained which can offer promising application of the proposed design to realize color filters, simultaneously. This dual functionality of the proposed structures as both color filters and anti-reflective coatings is so attractive to achieve decoration and light harvesting in the future. The optical properties of these nanostructures have been investigated by utilization of finite-difference time-domain method. Numerical simulations have been performed aiming to achieve a minimum reflectance and a broadband performance enhancement of the cell. The proposed design results in an improved photocurrent density of 13.2064 (mA/cm2) while offering an enhanced solar absorption of 80–90% over the wavelength range of about 400–625 nm.
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Keywords: ANTI-REFLECTIVE COATINGS (ARCS); LIGHT HARVESTING; NANO-GRATINGS; NANOSTRUCTURED COLOR FILTERS; ORGANIC SOLAR CELLS (OSCS); TITANIUM DIOXIDE

Document Type: Research Article

Publication date: November 1, 2018

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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