A single-material graded refractive index layer for improving the efficiency of III-V triple-junction solar cells

作者：Yeo Chan Il; Choi Hee Ju; Song Young Min; Kang Seok Jin; Lee Yong Tak^*

来源：Journal of Materials Chemistry A, 2015, 3(14): 7235-7240.

DOI：10.1039/c4ta06111j

We present a single-material titanium oxide (TiO2) bi-layer antireflection coating (ARC) produced using oblique angle deposition for improving the power conversion efficiency (PCE) of III-V compound semiconductor triple-junction (TJ) solar cells. Experimental demonstration of the porous TiO2 layers and optical modelling by rigorous coupled-wave analysis indicate that bi-layer TiO2 could be used as universal ARC for all known TJ stacks with various material combinations. The optimum TiO2 bi-layer ARC produced on a Ga0.5In0.5P/GaAs/Ge TJ solar cell exhibits considerably enhanced PCE of 31.6%, which is higher than that of the cells without ARC (23.8%) and with TiO2 single-layer ARC (29.1%). Incident angle-dependent device characteristics of the fabricated TJ solar cells are also discussed.

• 出版日期2015