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Enhancement of efficiency in graphene/porous silicon solar cells by co-doping of graphene with gold nanoparticles and bis(trifluoromethanesulfonyl)-amide

Abstract

Porous silicon (PSi) is an attractive building block for photonic devices such as solar cells and photodetectors due to its high ratio of surface to volume, low reflection, and high optical gain. In this work, PSi is prepared based on metal-assisted chemical etching by varying the deposition time (td) of Ag or Au nanoparticles (NPs) for the etching of Si from 1 to 7 s, thereby controlling the porosity of PSi. Co-doping of graphene with Au NPs and bis(trifluoromethanesulfonyl)-amide [(CF3SO2)2NH] is first employed for enhancing the performance of graphene/PSi Schottky-junction solar cells. The co-doping is proved to be very effective for increasing the work function of graphene as well as its electrical conductivity, resulting in efficient separation and collection of the photo-induced electron-hole pairs in the solar cells. The co-doped graphene/PSi solar cells show a maximum power-conversion efficiency (PCE) of 10.69 % at td= 5 s, and lose only 5 % of the original PCE value after 15 days in air. These results provide a new route for fabricating high-efficient and -stable graphene/PSi junction solar cells.

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Publication details

The article was received on 16 Jun 2017, accepted on 09 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02686B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Enhancement of efficiency in graphene/porous silicon solar cells by co-doping of graphene with gold nanoparticles and bis(trifluoromethanesulfonyl)-amide

    J. H. Kim, D. H. Shin, H. S. Lee, C. W. Jang, J. M. Kim, S. W. Seo, S. Kim and S. Choi, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02686B

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