基于三角形光栅结构的薄膜晶硅/PEDOT:PSS异质结太阳电池的陷光设计

DESIGN OF TRIANGULAR GRATINGS FOR THIN FILM SI/PEDOT:PSS HETEROJUNCTION SOLAR CELLS

针对薄膜硅的光学管理问题,通过有限元方法求解麦克斯韦基本方程组,研究基于一维三角形光栅结构对电池的光吸收率、光电流密度(Jph)和电场强度分布的影响,设计并优化适合2μm硅/PEDOT:PSS系统的双面一维三角形光栅结构,有效提升薄膜硅的光学吸收,并能与PEDOT:PSS形成优异的异质结,基于此结构的薄膜硅/PEDOT:PSS异质结太阳电池的效率可超过15%,展现了高效柔性薄膜硅/PEDOT:PSS HSCs的可行性。

Flexible thin-film crystalline silicon/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)heterojunction solar cells(HSCs)have attracted much attention,due to presenting the both merits of organic semiconductor(i.e.easy-manufacture and low-cost)and inorganic semiconductor with the excellent photoelectric properties.The indirect semiconductor c-Si has a low optical absorption coefficient,so the light-trapping structures on the silicon surface are need to improve the photocurrent density(Jph)of HSCs.In this paper,for improving the optical adsorption of c-Si thin film(2μm),solving the Maxwell’s basic equations by finite element method,the influence of one-dimensional(1-D)triangular gratings on the optical absorption,photocurrent density and electric field distribution of Si/PEDOT:PSS HSCs are investigated systematically.Double-sided 1-D triangular grating is designed to improve the light harvesting in the thin film Si/PEDOT:PSS HSCs,receiving a high power conversion efficiency of over 15%.Therefore,1-D triangular gratings is used to effectively manage the optical absorption of c-Si thin-film,furthermore,the conformal heterojunction of Si/PEDOT:PSS is easily formed as a basis for the high efficiency flexible HSCs.