Conversion Efficiency Enhancement of Multi-crystalline Si Solar Cells by Using a Micro-structured Junction

doi:10.1088/0256-307X/32/11/118401

Chin. Phys. Lett.

2015, Vol. 32

Issue (11): 118401 DOI: 10.1088/0256-307X/32/11/118401

CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY

Conversion Efficiency Enhancement of Multi-crystalline Si Solar Cells by Using a Micro-structured Junction

LI Li¹, YU Dong¹, WU Shi-Liang¹, WANG Wei¹, LIU Wen-Chao², WU Xiao-Shan¹, ZHANG Feng-Ming^1**

¹Collaborative Innovation Center of Advanced Microstructures, Lab of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093
²National Laboratory of Solid State Microstructures, Center of Photovoltaic Engineering and School of Modern Engineering and Applied Sciences, Nanjing University, Nanjing 210093

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LI Li, YU Dong, WU Shi-Liang et al 2015 Chin. Phys. Lett. 32 118401

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Abstract A new approach for enhancing the conversion efficiency of solar cells is proposed. A surface with columnar structures is employed on the fabrication of multi-crystalline silicon solar cells, for increasing the collection probability of photon-generated minority carriers in the cells. For comparison, three types of surfaces (planar surface, surfaces with columns of 12 μm in radius and columns of 9 μm in radius, respectively) are used. It is demonstrated that the cells with columnar structured surfaces have better spectral response and higher efficiencies than the cells with planar surface, while the cells with columns of 9 μm in radius show better spectral response than the cells with columns of 12 μm in radius. However, the cells with columns of 12 μm exhibit higher efficiencies than the cells with columns of 9 μm in radius for their difference in fill factors. Moreover, the effect of the columnar structured surface on the minority carrier collection efficiency is verified with wafers of different minority carrier lifetimes (0.5 μs and 1.0 μs). This work may significantly consider its potential in the manufacturing of high-efficiency solar cells at low cost by using low quality materials.

Received: 11 June 2015 Published: 01 December 2015

PACS:	84.60.-h	(Direct energy conversion and storage)
	84.60.Jt	(Photoelectric conversion)
	85.30.De	(Semiconductor-device characterization, design, and modeling)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/32/11/118401 OR https://cpl.iphy.ac.cn/Y2015/V32/I11/118401

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	LI Li
	YU Dong
	WU Shi-Liang
	WANG Wei
	LIU Wen-Chao
	WU Xiao-Shan
	ZHANG Feng-Ming

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