摘要
光吸收效率是提高薄膜太阳能电池的光电转换效率的关键,通过增加入射光在太阳能电池中的光程的方法提升电池的吸收效率。采用有限元法对薄膜太阳能电池进行参数和结构优化。首先设计了一维具有分布式布拉格反射器性能,波长范围在400~800nm的的光子晶体DBR结构作为电池的背反射,与单纯的PIN结构的太阳能电池相比,使光吸收效率和光谱响应分别提升了38%和45%,并在此基础上,在DBR表面刻蚀光栅作为薄膜硅太阳能电池的背底反射器。仿真结果表明:通过利用DBR的高反射性和光栅的衍射作用,在400~1 000nm光谱范围内,进一步提高了太阳能电池的光吸收效率和光谱响应,通过与单纯PIN太阳能电池相比较,光吸收率和光谱响应分别提升了61.6%,和85.4%。
Increasing light absorption efficiency is the key to improve the photoelectric conversion efficiency of the thin film solar cell.In this paper,the absorption efficiency of the solar cell was enhanced by increasing the optical path length of incident light.The structure parameters of the solar cells were simulated and optimized using the finite element method.A distributed Bragg reflector with a wavelength ranged from 400 nm to 800 nm was designed as a backside reflector for the thin film solar cells.Compared with the solar cell without backside reflector,the light absorption efficiency and spectral response were increased by 38% and 45%,respectively.Further,a diffraction grating etched at the surface of the distributed Bragg reflector was acted as a backside reflector.The simulation results show that light absorption efficiency and photocurrent can be strongly enhanced by high reflectivity and large angel diffraction.Compared with the solar cell without backside reflector,the light absorption efficiency and spectral response is increased by 61.6% and 85.4%,respectively.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2016年第5期402-405,428,共5页
Research & Progress of SSE
基金
国家自然科学基金SFC资助项目(61302101
61306003)
江苏省自然科学基金资助项目(BK20130874)
南京邮电大学校内资助项目(NY214051)
关键词
太阳能电池
布拉格反射器
光栅
吸收效率
光谱响应
solar cells
distributed Bragg reflector
grating
absorption efficiency
spectral response
