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Efficient light trapping of quasi-inverted nanopyramids in ultrathin c-Si through a cost-effective wet chemical method
- Tang, Quntao, Shen, Honglie, Gao, Kai, Yao, Hanyu, Jiang, Ye, Zheng, Chaofan, Pu, Tian, Li, Yufang, Liu, Youwen, Zhang, Lei
- RSC advances 2016 v.6 no.99 pp. 96686-96692
- cost effectiveness, nanosilver, silver, simulation models, solar cells, surface area
- In this paper, we report quasi-inverted nanopyramids (QIP) for light-trapping in ultrathin c-Si by a cost-effective wet chemical method. The QIP is fabricated by a well-known two-step Ag assisted chemical etching method followed by a post nanostructure rebuilding (NSR) process, lowering the surface area to ∼3.0 times for suppressing surface recombination losses. The comparable average absorptance value of 43 μm c-Si with double-sided QIP to that of 182 μm c-Si with double-sided conventional pyramid in the spectral range of 300–1100 nm demonstrates an over 4.2-fold reduction in material usage. Finally, a simulation model is proposed to explain the superiority of our QIP compared with the periodic inverted pyramid (IP) structure of the same size, presenting a promising method to the mass production of high-efficiency ultrathin c-Si HIT solar cells.