FU Shaojian ^{1, 2, 3}, YE Bin ², QIU Guilan ², ZENG Tao ^{2, 3, 4}, SHI Wei ^{2, 4}, WANG Lifu ^{2, 3}, CHEN Yunxia ^{2, 4}, LIU Zhiwei ¹

(1. Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China; 2. Jingdezhen Ceramic University, Jingdezhen 333403,Jiangxi, China; 3. Shangrao Jietai New Energy Tech Co., Ltd, Shangrao 333410, Jiangxi, China; 4. Jingdezhen Key Laboratory of Environmental Ceramics, Jingdezhen 333403, Jiangxi, China)

Abstract: With antireflection coating (ARC), the Fresnel reflection at the gas-solid interface can be reduced, which is one of the effective means to improve the performance conversion efficiency (PCE) of crystalline silicon solar cells. We proposed to use SiO_xN_y(1)/SiN_x(3) stacking layer as a front-side ARC to enhance the efficiency of incident photon in commercial bifacial PERC monocrystalline solar cells (182 mm×182 mm). Compared with the conventional SiN_x(4) ARC, the SiO_xN_y(1)/SiN_x(3) ARC is much stronger in suppressing the photon reflectivity over the range of 300–500 nm, especially in the shorter wavelength regime. The average PCE can be as high as 23.227% under standard test conditions (AM1.5, 1000 W ·m−2, 25 ℃), as compared with that of the conventional SiNx(4) ARC based cells (23. 128%). According to the QE spectrum integrated current loss analyzed with the SERIS-V1.5 software, the current loss of the SiON_y(1)/SiN_x(3) ARC cells was reduced to 0.867 mA ·cm−2 . Meanwhile, other parameters, such an open-circuit voltage and filling factor, can be also improved to a certain extent, while the rear-side PCEis not obviously affected. In addition, yield rate of the SiO_xN_y(1)/SiN_x(3) ARC cells that are checked with EL testing can match well with the conventional SiN_x(4) based cells, demonstrating the potential for large-scale production.

Key words: bifacial PERC; solar cells; antireflection coating; current loss