Fabrication and characterization of back-side illuminated InGaN/GaN solar cells with periodic via-holes etching and Bragg mirror processes

Yi An Chang, Fang Ming Chen, Yu Lin Tsai, Ching Wen Chang, Kuo Ju Chen, Shan Rong Li, Tien-Chang Lu, Hao-Chung Kuo*, Yen Kuang Kuo, Pei-Chen Yu, Chien-Chung Lin, Li Wei Tu

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

In this study, the design and fabrication schemes of back-side illuminated InGaN/GaN solar cells with periodic via-holes etching and Bragg mirror processes are presented. Compared to typical front-side illuminated solar cells, the improvements of open-circuit voltage (Voc) from 1.88 to 1.94 V and short-circuit current density (Jsc) from 0.84 to 1.02 mA/cm2 are observed. Most significantly, the back-side illuminated InGaN/GaN solar cells exhibit an extremely high fill factor up to 85.5%, leading to a conversion efficiency of 1.69% from 0.66% of typical frontside illuminated solar cells under air mass 1.5 global illuminations. Moreover, the effects of bottom Bragg mirrors on the photovoltaic characteristics of back-side illuminated solar cells are studied by an advanced simulation program. The results show that the Jsc could further be improved with a factor of 10% from the original back-side illuminated solar cell by the structure optimization of bottom Bragg mirrors.

Original languageEnglish
JournalOptics Express
Volume22
Issue numberSUPPL. 5
DOIs
StatePublished - 25 Aug 2014

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