Efficiency enhancement in Si solar cells by textured photonic crystal back reflector
Lirong ZengMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139Yuan‐Qiu‐Qiang YiMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139C.-Y. HongMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139Jifeng LiuMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139N. FengMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139Xili DuanMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139Lionel C. KimerlingMassachusetts Institute of Technology Department of Materials Science and Engineering, , Cambridge, Massachusetts 02139Bernard A. AlamariuMassachusetts Institute of Technology Microsystems Technology Laboratories, , Cambridge, Massachusetts 02139
2006en
ABI
Аннотация
An efficient light-trapping scheme is developed for solar cells that can enhance the optical path length by several orders of magnitude using a textured photonic crystal as a backside reflector. It comprises a reflection grating etched on the backside of the substrate and a one-dimensional photonic crystal deposited on the grating. Top-contacted crystalline Si solar cells integrated with the textured photonic crystal back reflector were designed and fabricated. External quantum efficiency was significantly improved between the wavelengths of 1000 and 1200nm (enhancement up to 135 times), and the overall power conversion efficiency was considerably increased.
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