25.54% efficient single-junction GaAs Solar cells using spin-on-film graded-index Tio 2 /SiO 2 AR-coating

We report high-efficiency single-junction GaAs Solar cells of 25.54% at one sun using a spin-on graded-index TiO 2 /SiO 2 films. Improved in efficiency, from 19.19% to 25.54%, was obtained when cell without/with proposed graded-index TiO 2 /SiO 2 AR-coating, respectively.