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Upcycling Silicon Photovoltaic Waste into Thermoelectrics
Advanced Materials ( IF 27.4 ) Pub Date : 2022-03-07 , DOI: 10.1002/adma.202110518
Jing Cao 1 , Ying Sim 2, 3 , Xian Yi Tan 1, 4 , Jie Zheng 1 , Sheau Wei Chien 1 , Ning Jia 4 , Kewei Chen 5 , Yeow Boon Tay 2, 4, 6 , Jin-Feng Dong 4 , Le Yang 1, 7 , Hong Kuan Ng 1 , Hongfei Liu 1 , Chee Kiang Ivan Tan 1 , Guofeng Xie 8 , Qiang Zhu 1 , Zibiao Li 1, 7, 9 , Gang Zhang 10 , Lei Hu 11 , Yun Zheng 12 , Jianwei Xu 1 , Qingyu Yan 4 , Xian Jun Loh 1 , Nripan Mathews 2, 3, 4 , Jing Wu 1, 7 , Ady Suwardi 1, 7
Affiliation  

Two decades after the rapid expansion of photovoltaics, the number of solar panels reaching end-of-life is increasing. While precious metals such as silver and copper are usually recycled, silicon, which makes up the bulk of a solar cells, goes to landfills. This is due to the defect- and impurity-sensitive nature in most silicon-based technologies, rendering it uneconomical to purify waste silicon. Thermoelectrics represents a rare class of material in which defects and impurities can be engineered to enhance the performance. This is because of the majority-carrier nature, making it defect- and impurity-tolerant. Here, the upcycling of silicon from photovoltaic (PV) waste into thermoelectrics is enabled. This is done by doping 1% Ge and 4% P, which results in a figure of merit (zT) of 0.45 at 873 K, the highest among silicon-based thermoelectrics. The work represents an important piece of the puzzle in realizing a circular economy for photovoltaics and electronic waste.

中文翻译:

将硅光伏废料升级为热电材料

在光伏技术迅速扩张的二十年后,达到使用寿命的太阳能电池板数量正在增加。虽然银和铜等贵金属通常被回收利用,但构成太阳能电池主体的硅却被送往垃圾填埋场。这是由于大多数基于硅的技术对缺陷和杂质敏感,这使得纯化废硅变得不经济。热电材料代表了一种罕见的材料,其中可以设计缺陷和杂质以提高性能。这是因为多数载流子的性质,使其能够容忍缺陷和杂质。在这里,可以将光伏 (PV) 废料中的硅升级为热电材料。这是通过掺杂 1% Ge 和 4% P 来实现的,这会产生品质因数 ( zT) 在 873 K 时为 0.45,是硅基热电材料中最高的。这项工作代表了实现光伏和电子废物循环经济的重要难题。
更新日期:2022-03-07
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