title: Large Absorption Enhancement in Ultrathin Solar Cells Patterned by Metallic Nanocavity Arrays.
abstract: A new type of light trapping structure utilizing ring-shaped metallic nanocavity arrays is proposed for the absorption enhancement in ultrathin solar cells with few photonic waveguide modes. Dozens of times of broadband absorption enhancement in the spectral range of 700 to 1100 nm is demonstrated in an ultrathin Si3N4/c-Si/Ag prototype solar cell by means of finite-difference time-domain (FDTD) simulation, and this dramatic absorption enhancement can be attributed to the excitation of plasmonic cavity modes in these nanocavity arrays. The cavity modes optimally compensate for the lack of resonances in the longer wavelength range for ultrathin solar cells, and eventually a maximum Jscenhancement factor of 2.15 is achieved under AM 1.5G solar illumination. This study opens a new perspective for light management in thin film solar cells and other optoelectronic devices.
authors.affiliation: State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.affiliation: State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.|Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China.
authors.forename: Jiasen
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Xiaozhou
authors.initials: X
authors.lastname: Che
authors.affiliation: State Key Lab for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
authors.forename: Guogang
authors.initials: G
authors.lastname: Qin