Ultrathin microcrystalline hydrogenated Si/Ge alloyed tandem solar cells towards full solar spectrum conversion

被引:41
作者
Cao, Yu [1 ,2 ]
Zhu, Xinyun [1 ,2 ]
Tong, Xingyu [2 ]
Zhou, Jing [3 ]
Ni, Jian [4 ]
Zhang, Jianjun [4 ]
Pang, Jinbo [5 ]
机构
[1] Northeast Elect Power Univ, Key Lab Modern Power Syst Simulat & Control Renew, Jilin 132012, Peoples R China
[2] Northeast Elect Power Univ, Sch Elect Engn, Jilin 132012, Peoples R China
[3] Northeast Elect Power Univ, Sch Chem Engn, Jilin 132012, Peoples R China
[4] Nankai Univ, Key Lab Photoelect Thin Film Devices & Tech Tianj, Inst Photoelect Thin Film Devices & Technol, Coll Elect Informat & Opt Engn, Tianjin 300350, Peoples R China
[5] Univ Jinan, Collaborat Innovat Ctr Technol & Equipment Biol D, iAIR, Jinan 250022, Peoples R China
基金
中国国家自然科学基金;
关键词
thin films; solar cells; quadruple junction solar cell; amorphous silicon; silicon germanium alloy; quantum efficiency; OPEN-CIRCUIT VOLTAGE; AMORPHOUS-SILICON; HIGH-EFFICIENCY; FILM; JUNCTION; LIGHT; WATER; ENHANCEMENT; ABSORPTION; GERMANIUM;
D O I
10.1007/s11705-019-1906-0
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Thin film solar cells have been proved the next generation photovoltaic devices due to their low cost, less material consumption and easy mass production. Among them, micro-crystalline Si and Ge based thin film solar cells have advantages of high efficiency and ultrathin absorber layers. Yet individual junction devices are limited in photoelectric conversion efficiency because of the restricted solar spectrum range for its specific absorber. In this work, we designed and simulated a multi-junction solar cell with its four sub-cells selectively absorbing the full solar spectrum including the ultraviolet, green, red as well as near infrared range, respectively. By tuning the Ge content, the record efficiency of 24.80% has been realized with the typical quadruple junction structure of a-Si:H/a-Si0.9Ge0.1:H/mu c-Si:H/mu c-Si0.5Ge0.5:H. To further reduce the material cost, thickness dependent device performances have been conducted. It can be found that the design of total thickness of 4 mm is the optimal device design in balancing the thickness and the PCE. While the design of ultrathin quadruple junction device with total thickness of 2 mm is the optimized device design regarding cost and long-term stability with a little bit more reduction in PCE. These results indicated that our solar cells combine the advantages of low cost and high stability. Our work may provide a general guidance rule of utilizing the full solar spectrum for developing high efficiency and ultrathin multi-junction solar cells.
引用
收藏
页码:997 / 1005
页数:9
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