Scalable perovskite/CIGS thin-film solar module with power conversion efficiency of 17.8%

© 2017 The Royal Society of Chemistry. All-thin film perovskite/CIGS multijunction solar modules, combining a semi-transparent perovskite top solar module stacked on a CIGS bottom solar module, are a promising route to surpass the efficiency limits of single-junction thin-film solar modules. In this work, we present a scalable thin-film perovskite/CIGS photovoltaic module with an area of 3.76 cm2and a power conversion efficiency of 17.8%. Our prototype outperforms both the record single-junction perovskite solar module of the same area as well as the reference CIGS solar module. The presented perovskite/CIGS thin-film multijunction solar module makes use of the "4-terminal architecture", which stacks the perovskite solar module in superstrate configuration on top of the CIGS solar module in substrate configuration. Both submodules apply a scalable interconnection scheme that can accommodate scale-up towards square meter scale thin-film multijunction solar modules. In order to identify the future potential of the presented stacked perovskite/CIGS thin-film solar module, we quantify the various losses in the presented prototype and identify the key challenges of this technology towards very high power conversion efficiencies.crosscheck: This document is CrossCheck deposited related_data: Supplementary Information identifier: U. W. Paetzold (ORCID) identifier: U. W. Paetzold (ResearcherID) identifier: M. Jaysankar (ResearcherID) identifier: W. Qiu (ORCID) identifier: J. Bastos (ORCID) copyright_licence: The Royal Society of Chemistry has an exclusive publication licence for this journal history: Received 23 February 2017; Accepted 19 April 2017; Accepted Manuscript published 19 April 2017; Advance Article published 10 May 2017; Version of Record published 23 May 2017status: publishe