title: Toward omnidirectional light absorption by plasmonic effect for high-efficiency flexible nonvacuum Cu(In,Ga)Se2 thin film solar cells.
abstract: We have successfully demonstrated a great advantage of plasmonic Au nanoparticles for efficient enhancement of Cu(In,Ga)Se2(CIGS) flexible photovoltaic devices. The incorporation of Au NPs can eliminate obstacles in the way of developing ink-printing CIGS flexible thin film photovoltaics (TFPV), such as poor absorption at wavelengths in the high intensity region of solar spectrum, and that occurs significantly at large incident angle of solar irradiation. The enhancement of external quantum efficiency and photocurrent have been systematically analyzed via the calculated electromagnetic field distribution. Finally, the major benefits of the localized surface plasmon resonances (LSPR) in visible wavelength have been investigated by ultrabroadband pump-probe spectroscopy, providing a solid evidence on the strong absorption and reduction of surface recombination that increases electron-hole generation and improves the carrier transportation in the vicinity of pn-juction.
authors.affiliation: Department of Photonics and Institute of Electro-Optical Engineering and ‡Department of Electrophysics, National Chiao-Tung University , Hsinchu 30010, Taiwan.
authors.forename: Shih-Chen
authors.initials: SC
authors.lastname: Chen
authors.forename: Yi-Ju
authors.initials: YJ
authors.lastname: Chen
authors.forename: Wei Ting
authors.initials: WT
authors.lastname: Chen
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Yen
authors.forename: Tsung Sheng
authors.initials: TS
authors.lastname: Kao
authors.forename: Tsung-Yeh
authors.initials: TY
authors.lastname: Chuang
authors.forename: Yu-Kuang
authors.initials: YK
authors.lastname: Liao
authors.forename: Kaung-Hsiung
authors.initials: KH
authors.lastname: Wu
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yabushita
authors.forename: Tung-Po
authors.initials: TP
authors.lastname: Hsieh
authors.forename: Martin D B
authors.initials: MD
authors.lastname: Charlton
authors.forename: Din Ping
authors.initials: DP
authors.lastname: Tsai
authors.forename: Hao-Chung
authors.initials: HC
authors.lastname: Kuo
authors.forename: Yu-Lun
authors.initials: YL
authors.lastname: Chueh
keywords: Cu(In,Ga)Se2; flexible; nanoparticles; omnidirectional light absorption; plasmonic effect; solar Cell