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Communication

Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells

1
School of Electronics Engineering, Kyungpook National University, 80, Daehak-ro, Daegu 41566, Korea
2
School of Electronic and Electrical Engineering, Kyungpook National University, 80, Daehak-ro, Daegu 41566, Korea
3
Division of Energy Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Yang Yang and Hugo Águas
Sensors 2021, 21(14), 4849; https://doi.org/10.3390/s21144849
Received: 1 June 2021 / Revised: 23 June 2021 / Accepted: 13 July 2021 / Published: 16 July 2021
(This article belongs to the Special Issue Photovoltaics Generators and Sensors)
In this paper, we propose an optimized structure of thin Cu(In,Ga)Se2 (CIGS) solar cells with a grating aluminum oxide (Al2O3) passivation layer (GAPL) providing nano-sized contact openings in order to improve power conversion efficiency using optoelectrical simulations. Al2O3 is used as a rear surface passivation material to reduce carrier recombination and improve reflectivity at a rear surface for high efficiency in thin CIGS solar cells. To realize high efficiency for thin CIGS solar cells, the optimized structure was designed by manipulating two structural factors: the contact opening width (COW) and the pitch of the GAPL. Compared with an unpassivated thin CIGS solar cell, the efficiency was improved up to 20.38% when the pitch of the GAPL was 7.5–12.5 μm. Furthermore, the efficiency was improved as the COW of the GAPL was decreased. The maximum efficiency value occurred when the COW was 100 nm because of the effective carrier recombination inhibition and high reflectivity of the Al2O3 insulator passivation with local contacts. These results indicate that the designed structure has optimized structural points for high-efficiency thin CIGS solar cells. Therefore, the photovoltaic (PV) generator and sensor designers can achieve the higher performance of photosensitive thin CIGS solar cells by considering these results. View Full-Text
Keywords: photovoltaics; thin CIGS solar cells; surface passivation; aluminum oxide photovoltaics; thin CIGS solar cells; surface passivation; aluminum oxide
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MDPI and ACS Style

Park, C.H.; Kim, J.Y.; Sung, S.-J.; Kim, D.-H.; Do, Y.S. Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells. Sensors 2021, 21, 4849. https://doi.org/10.3390/s21144849

AMA Style

Park CH, Kim JY, Sung S-J, Kim D-H, Do YS. Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells. Sensors. 2021; 21(14):4849. https://doi.org/10.3390/s21144849

Chicago/Turabian Style

Park, Chan H., Jun Y. Kim, Shi-Joon Sung, Dae-Hwan Kim, and Yun S. Do 2021. "Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells" Sensors 21, no. 14: 4849. https://doi.org/10.3390/s21144849

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