错位的保形光栅增强薄膜硅太阳能电池的光捕获

The effect of the relative lateral displacement between the front

and back sinusoidal textured layers of a conformal grating solar cell on light

trapping was investigated. For various amount of relative lateral

displacements and thicknesses of the active layer, the external quantum

efficiency (EQE) of the misaligned solar cell structures and their EQE

enhancement relative to the aligned structure were studied. For both aligned

and misaligned solar cell structures, the electric field distribution at the

wavelength corresponding to the EQE peaks was analyzed, and the

corresponding guided modes were identified. Additional modes were

observed in the misaligned grating structures. A 25.1 times enhancement of

the EQE at the wavelength of 950 nm and an average of 2.2 times

enhancement in the wavelength range from 700 to 900 nm were observed.

For the misaligned grating structure with the phase shift β = π/4 and the

active layer thickness DSi = 230 nm, a maximum short circuit current

density Jsc enhancement of 34% was achieved for normal incidence, and a

short circuit current enhancement of more than 15% was obtained for the

incident angle between −15° and + 15°.