Improved Metal Oxide Electrode for CIGS Solar Cells: The Application of an AgOX Wetting Layer

• Published in: Nanoscale research letters Vol. 16; no. 1; p. 50
• Main Authors: Neugebohrn, Nils, Osterthun, Norbert, Götz-Köhler, Maximilian, Gehrke, Kai, Agert, Carsten
• Format: Journal Article
• Language: English
• Published: New York Springer US 20.03.2021; Springer Nature B.V
• Subjects: Aluminum; Chemistry and Materials Science; Circuits; Coloring; Copper; Copper indium gallium selenides; Electrodes; Film thickness; Indium; Materials Science; Metal oxides; Metals; Molecular Medicine; Multilayers; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Photovoltaic cells; Short circuit currents; Short-circuit current; Silver; Solar cells; Thin films; Wetting; Zinc oxide; Zinc oxides; Wetting layer; Copper indium gallium selenide; Building integrated photovoltaics; Ultrathin Ag film; AgO; Transparent conductive electrode; Oxide–metal–oxide; Front contact
• ISSN: 1556-276X; 1931-7573; 1556-276X
• DOI: 10.1186/s11671-021-03506-1

Oxide/metal/oxide (OMO) layer stacks are used to replace transparent conductive oxides as front contact of thin-film solar cells. These multilayer structures not only reduce the overall thickness of the contact, but can be used for colouring of the cells utilizing interference effects. However, sheet resistance and parasitic absorption, both of which depend heavily on the metal layer, should be further reduced to reach higher efficiencies in the solar cells. In this publication, AgO X wetting layers were applied to OMO electrodes to improve the performance of Cu(In,Ga)Se 2 (CIGS) thin-film solar cells. We show that an AgO X wetting layer is an effective measure to increase transmission and conductivity of the multilayer electrode. With the presented approach, we were able to improve the short-circuit current density by 18% from 28.8 to 33.9 mA/cm 2 with a metal (Ag) film thickness as low as 6 nm. Our results highlight that OMO electrodes can be an effective replacement for conventional transparent conductive oxides like aluminium-doped zinc oxide on thin-film solar cells.