Efficiency Enhancement of Silicon Heterojunction Solar Cells via Photon Management Using Graphene Quantum Dot as Downconverters

Meng-Lin Tsai, Wei-Chen Tu, Libin Tang, Tzu-Chiao Wei, Wan-Rou Wei, Shu Ping Lau, Lih-Juann Chen, Jr-Hau He

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

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/cm2 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 ultra-high efficiency photovoltaic cells in the future.
Original languageEnglish (US)
Pages (from-to)309-313
Number of pages5
JournalNano Letters
Volume16
Issue number1
DOIs
StatePublished - Dec 28 2015

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