Neugebohrn Nils, Osterthun Norbert, Götz-Köhler Maximilian, Gehrke Kai, Agert Carsten
DLR Institute of Networked Energy Systems, Urban and Residential Technologies, Carl-von-Ossietzky-Str. 15, 26129, Oldenburg, Germany.
Nanoscale Res Lett. 2021 Mar 20;16(1):50. 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 wetting layers were applied to OMO electrodes to improve the performance of Cu(In,Ga)Se (CIGS) thin-film solar cells. We show that an AgO 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 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.
氧化物/金属/氧化物（OMO）层堆叠被用于替代透明导电氧化物作为薄膜太阳能电池的正面接触层。这些多层结构不仅降低了接触层的整体厚度，还可利用干涉效应实现电池的着色。然而，薄层电阻和寄生吸收都严重依赖于金属层，为了在太阳能电池中实现更高的效率，这两者都需要进一步降低。在本出版物中，将AgO润湿层应用于OMO电极以改善Cu(In,Ga)Se（CIGS）薄膜太阳能电池的性能。我们表明，AgO润湿层是提高多层电极传输率和导电性的有效措施。采用本文提出的方法，在金属（Ag）膜厚度低至6nm的情况下，我们能够将短路电流密度从28.8提高18%至33.9 mA/cm²。我们的结果突出表明，OMO电极可以有效替代薄膜太阳能电池上的传统透明导电氧化物，如掺铝氧化锌。
