High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact

It is widely known that thinner Si substrate is the main path for lower $/Watt HIT solar cells due to improved charge collection, reduced bulk and total recombination, and fewer raw material consumption (Panasonic, <italic>IEEE Journal of Photovoltaics.,</italic> vo...

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Main Authors:	Albert S. Lin, Parag Parashar, Chih-Chieh Yang, Wei-Ming Huang, Yi-Wen Huang, Ding-Rung Jian, Ming-Hsuan Kao, Shi-Wei Chen, Chang-Hong Shen, Jia-Min Shieh, Tseung Yuen Tseng
Format:	Article
Language:	English
Published:	IEEE 2017-01-01
Series:	IEEE Photonics Journal
Subjects:	Optoelectronic materials photovoltaics semiconductor materials inorganic materials.
Online Access:	https://ieeexplore.ieee.org/document/8030057/

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spelling	doaj-4aea7dbd377a4fa386c23b8aa727812e2021-04-05T16:53:48ZengIEEEIEEE Photonics Journal1943-06552017-01-01951910.1109/JPHOT.2017.27504878030057High Mechanical Strength Thin HIT Solar Cells With Graphene Back ContactAlbert S. Lin0Parag Parashar1Chih-Chieh Yang2Wei-Ming Huang3Yi-Wen Huang4Ding-Rung Jian5Ming-Hsuan Kao6Shi-Wei Chen7Chang-Hong Shen8Jia-Min Shieh9Tseung Yuen Tseng10Department of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanNational Nano Device Laboratories (NDL), Hsinchu, TaiwanNational Nano Device Laboratories (NDL), Hsinchu, TaiwanNational Nano Device Laboratories (NDL), Hsinchu, TaiwanNational Nano Device Laboratories (NDL), Hsinchu, TaiwanDepartment of Electronic Engineering, National Chiao-Tung University, Hsinchu, TaiwanIt is widely known that thinner Si substrate is the main path for lower $/Watt HIT solar cells due to improved charge collection, reduced bulk and total recombination, and fewer raw material consumption (Panasonic, <italic>IEEE Journal of Photovoltaics.,</italic> vol. 4, p. 96, 2014). Nonetheless, thin substrates always lead to low mechanical stability and wafer breaking. In this work, spray coated 50 nm graphene layer is used as the back electrode in Si HIT solar cells to enhance the mechanical stability. With the incorporation of graphene as the back electrode in Si HIT solar cells, remarkable improvements in substrate mechanical strength are achieved. Without the degradation of HIT solar cell efficiency, hardness is increased nearly twofold from 902 to 1747 HV. The Young's modulus is increased from 93.9 to 140.1 GPa while the ultimate tensile strength is increased from 96.71 to 273.68 MPa. Low-cost chemical exfoliation method and low-temperature (150 °C) spray coating method have been employed for the preparation and deposition of thin graphene back electrode, respectively. In addition, unlike the graphene as the substitute for ITO in OLED applications, the graphene strengthened thin silicon substrate technology here imposes no additional constraint on the graphene electrode transparency since it is used as a back electrode. We, thereby, believe that our proposed method is effective for attaining higher efficiency and lower $/Watt thin Si HIT solar cell technology with enhanced mechanical strength.https://ieeexplore.ieee.org/document/8030057/Optoelectronic materialsphotovoltaicssemiconductor materialsinorganic materials.
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Albert S. Lin Parag Parashar Chih-Chieh Yang Wei-Ming Huang Yi-Wen Huang Ding-Rung Jian Ming-Hsuan Kao Shi-Wei Chen Chang-Hong Shen Jia-Min Shieh Tseung Yuen Tseng
spellingShingle	Albert S. Lin Parag Parashar Chih-Chieh Yang Wei-Ming Huang Yi-Wen Huang Ding-Rung Jian Ming-Hsuan Kao Shi-Wei Chen Chang-Hong Shen Jia-Min Shieh Tseung Yuen Tseng High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact IEEE Photonics Journal Optoelectronic materials photovoltaics semiconductor materials inorganic materials.
author_facet	Albert S. Lin Parag Parashar Chih-Chieh Yang Wei-Ming Huang Yi-Wen Huang Ding-Rung Jian Ming-Hsuan Kao Shi-Wei Chen Chang-Hong Shen Jia-Min Shieh Tseung Yuen Tseng
author_sort	Albert S. Lin
title	High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact
title_short	High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact
title_full	High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact
title_fullStr	High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact
title_full_unstemmed	High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact
title_sort	high mechanical strength thin hit solar cells with graphene back contact
publisher	IEEE
series	IEEE Photonics Journal
issn	1943-0655
publishDate	2017-01-01
description	It is widely known that thinner Si substrate is the main path for lower $/Watt HIT solar cells due to improved charge collection, reduced bulk and total recombination, and fewer raw material consumption (Panasonic, <italic>IEEE Journal of Photovoltaics.,</italic> vol. 4, p. 96, 2014). Nonetheless, thin substrates always lead to low mechanical stability and wafer breaking. In this work, spray coated 50 nm graphene layer is used as the back electrode in Si HIT solar cells to enhance the mechanical stability. With the incorporation of graphene as the back electrode in Si HIT solar cells, remarkable improvements in substrate mechanical strength are achieved. Without the degradation of HIT solar cell efficiency, hardness is increased nearly twofold from 902 to 1747 HV. The Young's modulus is increased from 93.9 to 140.1 GPa while the ultimate tensile strength is increased from 96.71 to 273.68 MPa. Low-cost chemical exfoliation method and low-temperature (150 °C) spray coating method have been employed for the preparation and deposition of thin graphene back electrode, respectively. In addition, unlike the graphene as the substitute for ITO in OLED applications, the graphene strengthened thin silicon substrate technology here imposes no additional constraint on the graphene electrode transparency since it is used as a back electrode. We, thereby, believe that our proposed method is effective for attaining higher efficiency and lower $/Watt thin Si HIT solar cell technology with enhanced mechanical strength.
topic	Optoelectronic materials photovoltaics semiconductor materials inorganic materials.
url	https://ieeexplore.ieee.org/document/8030057/
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High Mechanical Strength Thin HIT Solar Cells With Graphene Back Contact

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