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KEXIANG HU1,2,* , PEIHUA WANGYANG3, LE CHEN2, QINGKANG WANG2
- National and Local Joint Engineering Laboratory of Internet Technology on Mine, School of Information and Control Engineering, China University of Mining and Technology, 1 Jinshan East Road, Quanshan
- National Key Laboratory of Micro/Nano Fabrication Technology, Key Laboratory fo r Thin Film and Microfabrication Technology of Ministry of Education, School of electronic information and electrical e
- Sichuan Province Key Laboratory of Information Materials and Devices Application, College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, P. R. China
In this paper, the optical properties and the electromagnetic field energy density distribution of the silicon square nanoconical hole (SiSNH) arrays are systematically studied via simulation based on Rigorous Coupled Wave Analysis (RCWA) and Finite Difference Time Domain (FDTD). The results show that when the SiSNH top diameter (Dtop) equal to the array periodicity, the high-efficiency solar energy harvesting will be obtained. When the SiSNH's Dtop equals to the array periodicity (700 nm), the bottom diameter (Dbot) equals to 100 nm and the array length reaches 1800 nm (which contains the hole depth of 1000 nm and the film thickness of 800 nm), the geometrical parameters of the light trapping structure are optimized well and the broadband optical absorption could be enhanced. The optimized SiSNH surface textured crystalline silicon thin film solar cell could yield an ultimate photoelectric conversion efficiency of 38.48%, which is 2.78 times of a 2.33 μm thick film solar cells. Comparing to nanopillar and square nanoconical frustum structures (SiSNF), the photoelectric conversion efficiency of SiSNH surface textured crystalline silicon thin film solar cell is less sensitive to the SiSNH's Dbot. In addition, energy density distribution of the light field in the optimized light trapping array above and the physical mechanism behind the observation are also explored in this work..
Light trapping, Energy density, Photoelectric conversion, Guided-mode resonance.
Submitted at: Sept. 25, 2016
Accepted at: Aug. 9, 2017
KEXIANG HU, PEIHUA WANGYANG, LE CHEN, QINGKANG WANG, Study on optical characteristics of wideband anti-reflective enhancement based on silicon square nanoconical hole arrays, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 7-8, pp. 459-468 (2017)
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