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Leo T. Varghese, Yi Xuan, Ben Niu, Li Fan, Peter Bermel and Minghao Qi Photonic Crystals: Enhanced Photon Management of Thin-Film Silicon Solar Cells Using Inverse Opal Photonic Crystals with 3D Photonic Bandgaps (Advanced Optical Materials 10/2013) Advanced Optical Materials 1

Article first published online: 17 OCT 2013 | DOI: 10.1002/adom.201370059

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To enhance light trapping, M. Qi, P. Bermel, and co-workers use 3D photonic crystals (PhCs) as back-reflectors for solar cells. On page 692, a novel S5 process is developed to form a freestanding, self-assembled, inverse opal PhC, which is then transferred onto a commercial thinfilm silicon solar cell. As illustrated in the image, light impinging onto the PhC not only reflects but also diffracts back into the solar cell, resulting in increased electron–hole pair generation and a material efficiency enhancement of 10%.

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