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Title: | Ultrathin Cu(In,Ga)Se-2 Solar Cells with Ag/AlOx Passivating Back Reflector | Authors: | DE WILD, Jessica BIRANT, Gizem BRAMMERTZ, Guy MEURIS, Marc POORTMANS, Jef VERMANG, Bart |
Issue Date: | 2021 | Publisher: | MDPI | Source: | Energies, 14 (14) (Art N° 4268) | Abstract: | Ultrathin Cu(In,Ga)Se-2 (CIGS) absorber layers of 550 nm were grown on Ag/AlOx stacks. The addition of the stack resulted in solar cells with improved fill factor, open circuit voltage and short circuit current density. The efficiency was increased from 7% to almost 12%. Photoluminescence (PL) and time resolved PL were improved, which was attributed to the passivating properties of AlOx. A current increase of almost 2 mA/cm(2) was measured, due to increased light scattering and surface roughness. With time of flight-secondary ion mass spectroscopy, the elemental profiles were measured. It was found that the Ag is incorporated through the whole CIGS layer. Secondary electron microscopic images of the Mo back revealed residuals of the Ag/AlOx stack, which was confirmed by energy dispersive X-ray spectroscopy measurements. It is assumed to induce the increased surface roughness and scattering properties. At the front, large stains are visible for the cells with the Ag/AlOx back contact. An ammonia sulfide etching step was therefore applied on the bare absorber improving the efficiency further to 11.7%. It shows the potential of utilizing an Ag/AlOx stack at the back to improve both electrical and optical properties of ultrathin CIGS solar cells. | Keywords: | Cu(In;Ga)Se-2;ultrathin films;silver doping;AlOx;passivation;optical enhancement | Document URI: | http://hdl.handle.net/1942/36053 | e-ISSN: | 1996-1073 | DOI: | 10.3390/en14144268 | ISI #: | 000676729700001 | Rights: | 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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Ultrathin Cu(In,Ga)Se2 Solar Cells with Ag_AlOx Passivating Back Reflector.pdf | Published version | 6.26 MB | Adobe PDF | View/Open |
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