Broadb and antireflection sub-wavelength structure of InGaP/InGaAs/Ge triple junction solar cell with composition-graded SiNx

Chen Chen Chung, Hsiao Chieh Lo, Yen Ku Lin, Hung Wei Yu, Binh Tinh Tran, Kung Liang Lin, Yung Chang Chen, Nguyen Hong Quan, Edward Yi Chang, Yuan Chieh Tseng

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This work reports a fabrication strategy to improve the antireflective ability of a InGaP/GaAs/Ge triple-junction solar cell, by combining a nano-templating technique and a chemical-synthesis approach. SiH 4 and N 2 were used as ammonia-free reaction gases in a plasma-enhanced chemical vapor deposition (PECVD) to prepare Si 3 N 4 as an original antireflective coating (ARC) layer with better chemical stability. Composition-graded SiNx was successfully integrated with sub-wave length structure by modulating SiH 4 /N 2 ratio during PECVD deposition, and followed by a controllable gold-nanoparticle masking technique on top of the solar cell. Finite-difference time-domain solution was employed to simulate and optimize the aspect-ratio of the ARC, under the condition of variable refractive index over a broad wavelength window, and followed by the masking technique to obtain the desired ARC dimension. This enabled a low light reflectance (<10%) over a broad spectral bandwidth (300-1800 nm) for the solar cell with excellent stability, because of the triple advantages of structural optimization, better chemical stability and graded refractive index of the ARC. The solar cell's performance was tested and showed great competitiveness to those of forefront studies, suggesting the feasibility of the proposed technology.

Original languageEnglish
Article number055505
JournalMaterials Research Express
Volume2
Issue number5
DOIs
StatePublished - 1 May 2015

Keywords

  • Antireflection
  • Solar cell
  • Sub wavelength structure

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