Totally Vacuum-Free Processed Crystalline Silicon Solar Cells over 17.5% Conversion Efficiency

Abstract

Abstract:In this work, we introduce a totally vacuum-free cost-efficient crystalline silicon solar cells. Solar cells were fabricated based on low-cost techniques including spin coating, spray pyrolysis, and screen-printing. A best efficiency of 17.51% was achieved by non-vacuum process with a basic structure of <AI/p+/p−Si/n+/SiO 2 /TiO 2 /Ag> CZ-Si p-type solar cells. Short circuit current density (J SC ) and open circuit voltage (V OC ) of the best cell were measured as 38.1 mA·cm −2 and 596.2 mV, respectively with fill factor (FF) of 77.1%. Suns-Voc measurements were carried out and the detrimental effect of the series resistance on the performance was revealed. It is concluded that higher efficiencies are achievable by the improvements of the contacts and by utilizing good quality starting wafers.

Effect of Silicon Surface for Perovskite/Silicon Tandem Solar Cells: Flat or Textured?

“…45 The samples were textured in an alkaline solution using KOH (0.9 M in water, 80 °C, 30 min) with an additive of Alka-Tex (0.28% in volume ratio) to achieve a random pyramid texture on the front surface. 46 The height and period of the texture in this study are consistent with the commonly used silicon surface of 5−10 μm. 30,37 After rinsing the samples with deionized water and dipping in aqueous HF (10% in volume ratio), SiO 2 was once again coated on the rear side of the samples using polysilazan as a diffusion barrier for phosphorus doping.…”

White paper on the future of plasma science for optics and glass

“…Practical technological challenges and barriers seem to be partly determined by a lack of data on the non‐linear properties of glasses, the temperature limitations of glass composites, a lack of understanding of the surface structure, surface chemistry and surface interactions with other materials at the molecular level, limited processes for online coatings, and a lack of substitutes for toxic glass components . Consequently, research and development activities will aim to improve or develop key enabling technologies and products, such as: Cost‐effective optically non‐linear glasses and graded index glasses; Improved processes for glass substrates used in thin film applications; Non‐oxide glasses with advanced compositions; Glasses with ultraviolet and infrared transparent characteristics; Alkali‐resistant systems for concrete reinforcement; Processes and compositions for smart window products; Improved processing methods for solar lenses, mirrors, and photovoltaic cells; Systems for controlled release of fertilizers, herbicides, insecticides, and pest control, or for the encapsulation of various types of hazardous waste in glass; Economical processes for the high‐speed coating of glass; Compositions with reactive surfaces for bio‐applications and sensor applications; Compositions with passive surfaces that can be used to maintain the strength of glass; Increased understanding of glass‐surface interactions through experimental and theoretical surface research …”