Multilayered Hematite Nanowires with Thin‐Film Silicon Photovoltaics in an All‐Earth‐Abundant Hybrid Tandem Device for Solar Water Splitting

The authors acknowledge funding from Generalitat de Catalunya through the CERCA program, 2017 SGR 1246, 2017 SGR 327 and the Spanish MINECO projects MAT2014‐59961, ENE2016‐80788‐C5‐5‐R and ENE2017‐85087, together with the support from REPSOL, S. A. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV‐2017‐0706). IREC also acknowledges additional support from the European Regional Development Funds (ERDF, FEDER), (S)TEM part of the present work has been performed in the framework of Universitat Autonoma de Barcelona Materials Science PhD program and the rest in the Nanoscience program of the University of Barcelona. The authors thank S. Moll (IEK‐5), M. Biset‐Peiro (IREC), and H. Xie (IREC) for their contribution to this work. F.U. acknowledges financial support from MINECO through Juan de la Cierva fellowship (FJCI‐2016–29147).V.S., K.W., and F.F. (authors from IEK‐5) thank the Deutsche Forschungsgemeinschaft (DFG) (Priority Program SPP 1613).