Nanoparticle-induced light scattering for improved performance of quantum-well solar cells

Derkacs, D.; Chen, W. V.; Matheu, P. M.; Lim, S. H.; Yu, P. K. L.; Yu, E. T.
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p091107
Academic Journal
We report on the improved performance of InP/InGaAsP quantum-well waveguide solar cells via light scattering from deposited dielectric or metal nanoparticles. The integration of metal or dielectric nanoparticles above the quantum-well solar cell device is shown to couple normally incident light into lateral optical propagation paths, with optical confinement provided by the refractive index contrast between the quantum-well layers and surrounding material. With minimal optimization, short-circuit current density increases of 12.9% and 7.3% and power conversion efficiency increases of 17% and 1% are observed for silica and Au nanoparticles, respectively.


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