Performance improvement of an ultra-thin amorphous silicon solar cell using multilayers chirped diffraction back gratings. (1st March 2022)

• Record Type: Journal Article
• Authors: Shahamat, Mehran Abdolrahimi; Heidarzadeh, Hamid; Bahador, Hamid
• Is Part Of: Physica scripta. Volume 97:Number 3(2022)
• Publication Date: 2022-03-01
• Subjects: amorphous silicon solar cell -- thin-film -- solar cells -- chirped grating -- light trapping; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ac52d0
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: In this paper, a systematic design of a novel back reflector using chirped grating structures is investigated for thin-film amorphous silicon (a-Si) solar cells. At first, a cell with an optimum ITO antireflecting layer is simulated and a photocurrent of 17.67 mA cm −2 is obtained. Then a conventional grating from SiO2 is evaluated and the maximum photocurrent of 18.97 mA cm −2 is calculated. Then a thin-film solar cell based on the chirped back grating is designed and the photocurrent is increased to 19.30 mA cm −2 . Also, their integrated optical absorption is compared for better understanding. To give a numerical comparison of the cells with a different number of chirped grating layers, a short circuit current for different numbers of grating layers is analyzed. It is shown that maximum current density is obtained for 5 layers grating with the chirped coefficient length of near 20 nm. It is believed that chirped back grating can be used to design higher performance thin film a-Si solar cells and the results are helpful for photovoltaic applications.