An efficient broadband and omnidirectional light-harvesting scheme employing a hierarchical structure based on a ZnO nanorod/Si3N 4-coated Si microgroove on 5-inch single crystalline Si solar cells

Chin An Lin, Kun Yu Lai, Wei Cheng Lien, Jr-Hau He*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We employ a ZnO nanorod/Si3N4-coated Si microgroove-based hierarchical structure (HS) for a light-harvesting scheme in 5 inch single crystalline Si solar cells. ZnO nanorods and Si microgrooves were fabricated by a simple and scalable aqueous process. The excellent light-harvesting characteristics of the HS, such as broadband working ranges and omnidirectionality have been demonstrated using external quantum efficiencies and reflectance measurements. The solar cells with the hierarchical surface exhibit excellent photovoltaic characteristics, i.e., a short-circuit current (JSC) of 38.45 mA cm-2, open-circuit voltage of 609 mV and conversion efficiency of 14.04%. As incident angles increase from 0° to 60°, only 5.3% JSC loss is achieved by employing the hierarchical surface, demonstrating the enhanced omnidirectional photovoltaic performances, also confirmed by the theoretical analysis. A viable scheme for broadband and omnidirectional light harvesting using the HS employing microscale/nanoscale surface textures on single crystalline Si solar cells has been demonstrated.

Original languageEnglish (US)
Pages (from-to)6520-6526
Number of pages7
JournalNanoscale
Volume4
Issue number20
DOIs
StatePublished - Oct 21 2012

ASJC Scopus subject areas

  • Materials Science(all)

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