title: Efficiency Enhancement of Silicon Heterojunction Solar Cells via Photon Management Using Graphene Quantum Dot as Downconverters.
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/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.
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia.|Department of Materials Science and Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan, Republic of China.
authors.forename: Meng-Lin
authors.initials: ML
authors.lastname: Tsai
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Wei-Chen
authors.initials: WC
authors.lastname: Tu
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Libin
authors.initials: L
authors.lastname: Tang
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Tzu-Chiao
authors.initials: TC
authors.lastname: Wei
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Wan-Rou
authors.initials: WR
authors.lastname: Wei
authors.affiliation: Department of Applied Physics, The Hong Kong Polytechnic University , Hung Hom, Hong Kong.
authors.forename: Shu Ping
authors.initials: SP
authors.lastname: Lau
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University , Hsinchu 30013, Taiwan, Republic of China.
authors.forename: Lih-Juann
authors.initials: LJ
authors.lastname: Chen
authors.affiliation: Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science & Technology (KAUST) , Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Jr-Hau
authors.initials: JH
authors.lastname: He
keywords: graphene; heterojunction; photovoltaic; quantum dot; solar cells