椭圆硅纳米线阵列的宽带吸收增强光伏应用

Semiconducting nanowire arrays have emerged as a promising

route toward achieving high efficiencies in solar cells. Here we propose a

perpendicular elliptical silicon nanowire (PEE-SiNW) array for broadband

light absorption in thin film silicon solar cells. Simulation results reveal that

light absorption enhancement is originated from the split of the principal

modes as well as the excitation of high order modes caused by the

asymmetry of the elliptical nanowires and the enhanced mode coupling

between adjacent elliptical nanowires attained by the appropriate

arrangement of nanowires. An ultimate efficiency of 29.1% is achieved for

the optimal PEE-SiNW array, which is 16.4% higher than that of the

circular SiNW array with the same fill fraction.