Optimizing surface plasmon resonance effects on finger electrodes to enhance the efficiency of silicon-based solar cells

Yi Min Chi, Hsuen Li Chen, Yu Sheng Lai, Ho Ming Chang, Yuan Chen Liao, Chao Chia Cheng, Szu Huang Chen, Shao Chin Tseng, Keng Te Lin

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this paper we demonstrate a technique for improving the conversion efficiency in conventional silicon solar cells by using surface plasmon resonance (SPR) effects to harvest incident light energy over metal finger electrodes. According to three-dimensional finite-difference time-domain (3D-FDTD) analysis, incident light covering a broad bandwidth of the solar spectrum can be transmitted through metallic hole array structures. Although the light absorption region beneath the metal finger electrodes cannot generate a photocurrent, in this study, we employ the extraordinary transmission (EOT) phenomenon, due to SPR effects, to dramatically increase the degree of light harvesting below the metal electrodes and, thereby, improve the efficiency of the entire solar cell. Experimental data reveal that the excess photocurrent density was approximately 190% of the normal current density of a standard solar cell. Therefore, the negative effect of covering the absorption area with opaque metal finger electrodes can be minimized or eliminated completely by taking advantage of the SPR effect of the metal electrodes.

Original languageEnglish
Pages (from-to)935-942
Number of pages8
JournalEnergy and Environmental Science
Volume6
Issue number3
DOIs
StatePublished - Mar 2013

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