Asymmetry in photocurrent enhancement by plasmonic nanoparticle arrays located on the front or on the rear of solar cells

作者：Beck F J^*; Mokkapati S; Polman A; Catchpole K R

来源：Applied Physics Letters, 2010, 96(3): 033113.

DOI：10.1063/1.3292020

• elemental semiconductors
• nanoparticles
• photoemission
• plasmonics
• silicon
• silver
• solar cells

We show experimentally that there is asymmetry in photocurrent enhancement by Ag nanoparticle arrays located on the front or on the rear of solar cells. The scattering cross-section calculated for front- and rear-located nanoparticles can differ by up to a factor of 3.7, but the coupling efficiency remains the same. We attribute this to differences in the electric field strength and show that the normalized scattering cross-section of a front-located nanoparticle varies from two to eight depending on the intensity of the driving field. In addition, the scattering cross-section of rear-located particles can be increased fourfold using ultrathin spacer layers.

• 出版日期2010-1-18