空芯光纤硅太阳能电池制备及光捕获研究

摘要

A stainless steel hollow fiber silicon solar cell was proposed in this work. The fabrication and light capturing performance ( LCP ) of this cell were investigated. The hollow fiber silicon solar cell was designed based on the light absorption principle of flat batteries and the light capture mechanism of a hollow waveguide. A cylindrical hollow fiber silicon battery was fabricated by rolling a flexible flat amorphous silicon thin film solar cell. The LCP of the hollow fiber cell was evaluated by comparing its photo-current and photo-voltage to a flat solar cell under the same light incident conditions. The photo-current and photo-voltage of the battery was measured under different light incidence angle and illumination intensity to reveal their influence on LCP . Results indicate that the hollow fiber can constraint the incident light in the hollow waveguide for repeated absorption and reflection to improve the LCP (~19.8%) . The light incidence angle has great influence on the LCP and relatively high photo-current and photo-voltage can be obtained at the light incidence angle of 30°~50°. The photo-voltage goes up when the light intensity increases in the range of 0~100000 lux, and gradually becomes a constant value if light intensity further increases. It is possible to improve LCP by rolling flexible planar silicon cells to form a hollow fiber structure. Higher LCP could be achieved via a hollow fiber silicon solar cell fabricated with a simple flat structured and low absorption thin film cell.%本文提出一种空芯光纤结构硅基太阳能电池,并探讨其制备方法和光捕获性能.依据平面电池受光原理和空芯波导的限光机制提出了空芯光纤硅基太阳能电池结构,采用卷曲柔性平面非晶硅薄膜电池制备出圆筒形空芯光纤硅电池.通过对比研究入射光量一定的条件下平面电池和空芯光纤电池的光生电流和电压值,评估空芯光纤电池的光捕获效果.通过测量不同光入射角度和光照强度下空芯光纤电池的光生电流和电压值,揭示光入射角度和光照强度对空芯光纤电池光捕获性能的影响关系.研究表明,空芯光纤硅基电池能将入射光线限制在波导结构内反复吸收和反射,从而在光捕获性能方面较平面电池有所提升(~19.8%).光线入射角度对空芯光纤电池的光捕获性能有较大影响,在30°~50°入射时可以获得较大的光生电压和电流值.在0~100000 lux的光照强度范围内,光生电压先随光照度增加而增大,而后逐渐趋于恒定值.通过卷曲柔性平面硅电池获得光捕获效率较高的空芯光纤硅电池是可行的,采用结构简单、光线单次入射吸收较低的单节薄膜电池制备空芯光纤电池有望获得更好的光捕获效率提升效果.