Carbon quantum dots interfacial modified graphene/silicon Schottky barrier solar cell

JOURNAL OF ALLOYS AND COMPOUNDS

卷:835

Article

Geng, Chao¹  Shang, Yudong²  Qiu, JiaJia¹  Wang, Qidi¹  Chen, Xiuhua²  Li, Shaoyuan^1,4  Ma, Wenhui¹  Fan, Hua-Jun³  Omer, Altyeb-Ali-Abaker¹  Chen, Ran⁴ 

[1] Kunming Univ Sci & Technol, Inst New Energy, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China

[2] Yunnan Univ, Fac Phys Sci & Technol, Kunming 650091, Yunnan, Peoples R China

[3] Prairie View A&M Univ, Dept Chem, Prairie View, TX 77446 USA

[4] Univ New South Wales, Sch Photovolta & Renewable Energy Engn, Australian Ctr Adv Photovolta, Sydney, NSW 2052, Australia

关键词: Graphene/silicon solar cell;    Carbon quantum dots;    Interfacial modification;    Energy band structure;   

DOI  :  10.1016/j.jallcom.2020.155268

来源: Elsevier

【 摘 要 】

The two-dimensional thin film, as an effective interface modification layer to improve the power conversion efficiency (PCE) of graphene/silicon (Gr/Si) heterojunction solar cells has attracted extensive attention recently. However, the complicated manufacturing process and specialized equipment requirements impede its broad application. Herein, carbon quantum dots (CQDs) fabricated under the mild reaction condition was first time used to modify Gr/Si devices interface structure. The effects of CQDs size distributions and coating thickness on J-V characteristics and the energy band structure of Gr/CQDs/Si solar cells were systematically analyzed. The results indicate that the PCE of resulting Gr/CQDs/Si solar cells could reach 9.97% when the thickness and sizes of CQDs interlayer are -26 nm and 4-7 nm, without any chemical doping, which is 6.8-times PCE than that of virgin Gr/Si solar cells. The CQDs interlayer serves as both an electron blocking layer and hole transport layer to reduce the carrier recombination, leading to a lower reverse saturation current as well as a larger V-OC then improved the device performance. The enhanced PCE shows that the CQDs species have the potential applications in a cost-effective photovoltaic device. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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