Journal
NANO LETTERS
Volume 16, Issue 1, Pages 309-313Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03814
Keywords
heterojunction; graphene; quantum dot; solar cells; photovoltaic
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Funding
- Research Grants Council of Hong Kong [PolyU 153012/14P]
- National Natural Science Foundation of China (NSFC) [11374250]
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By employing graphene quantum dots (GQDs), we have achieved a high efficiency of 16.55% in n-type Si heterojunction solar cells. The efficiency enhancement is based on the photon downconversion phenomenon of GQDs to make more photons absorbed in the depletion region for effective carrier separation, leading to the enhanced photovoltaic effect. The short circuit current and the fill factor are increased from 35.31 to 37.47 mA/cm(2) and 70.29% to 72.51%, respectively. The work demonstrated here holds the promise for incorporating graphene-based materials in commercially available solar devices for developing ultrahigh efficiency photovoltaic cells in the future.
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