000865074 001__ 865074 000865074 005__ 20240712084510.0 000865074 0247_ $$2doi$$a10.1515/zpch-2019-1453 000865074 0247_ $$2ISSN$$a0942-9352 000865074 0247_ $$2ISSN$$a2196-7156 000865074 0247_ $$2Handle$$a2128/25156 000865074 0247_ $$2altmetric$$aaltmetric:77843743 000865074 0247_ $$2WOS$$aWOS:000542554000002 000865074 037__ $$aFZJ-2019-04636 000865074 082__ $$a540 000865074 1001_ $$0P:(DE-Juel1)130238$$aFinger, Friedhelm$$b0$$eCorresponding author 000865074 245__ $$aPhotoelectrochemical Water Splitting using Adapted Silicon Based Multi-Junction Solar Cell Structures: Development of Solar Cells and Catalysts, Upscaling of Combined Photovoltaic-Electrochemical Devices and Performance Stability 000865074 260__ $$aBerlin$$bDe Gruyter$$c2020 000865074 3367_ $$2DRIVER$$aarticle 000865074 3367_ $$2DataCite$$aOutput Types/Journal article 000865074 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1603279627_7242 000865074 3367_ $$2BibTeX$$aARTICLE 000865074 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000865074 3367_ $$00$$2EndNote$$aJournal Article 000865074 520__ $$aThin film silicon based multi-junction solar cells were developed for application in combined photovoltaic electrochemical systems for hydrogen production from water splitting. Going from single, tandem, triple up to quadruple junctions, we cover a range of open circuit voltages from 0.5 V to 2.8 V at photovoltaic cell (PV) efficiencies above 13%. The solar cells were combined with electrochemical (EC) cells in integrated devices from 0.5 cm2 to 64 cm2. Various combinations of catalyst pairs for the oxygen and hydrogen evolution reaction side (OER and HER) were investigated with respect to electrochemical activity, stability, cost and – important for the integrated device – optical quality of the metal catalyst on the HER side as back reflector of the attached solar cell. The combined PV-EC systems were further investigated under varied operation temperatures and illumination conditions for estimation of outdoor performance and annual fuel production yield. For 0.5 cm2 size combined systems a maximum solar-to-hydrogen efficiency ηSTH = 9.5% was achieved under standard test conditions. For device upscaling to 64 cm2 various concepts of contact interconnects for reduced current and fill factor loss when using large size solar cells were investigated. To replace high performance noble metal based catalyst pairs (Pt/RuO2 or Pt/IrOx), more abundant and cheaper NiMo (HER) and NiFeOx (OER) compounds were prepared via electrodeposition. With the NiMo/NiFeOx catalyst pair we obtained ηSTH = 5.1% for a 64 cm2 size solar cell which was even better than the performance of the Pt/IrO2 system (ηSTH = 4.8%). In simulated day-night cycle operation the NiMo/NiFeOx catalyst pair showed excellent stability over several days. The experimental studies were successfully accompanied by simulation of the entire PV-EC device using a series connection model which allowed studies and pre-estimations of device performance by varying individual components such as catalysts, electrolytes, or solar cells. Based on these results we discuss the prospects and challenges of integrated PV-EC devices on large area for hydrogen and solar fuel production in general. 000865074 536__ $$0G:(DE-HGF)POF3-121$$a121 - Solar cells of the next generation (POF3-121)$$cPOF3-121$$fPOF III$$x0 000865074 588__ $$aDataset connected to CrossRef 000865074 7001_ $$0P:(DE-Juel1)167359$$aWelter, Katharina$$b1$$ufzj 000865074 7001_ $$0P:(DE-Juel1)156469$$aUrbain, Félix$$b2 000865074 7001_ $$0P:(DE-Juel1)130297$$aSmirnov, Vladimir$$b3$$ufzj 000865074 7001_ $$0P:(DE-HGF)0$$aKaiser, Bernhard$$b4 000865074 7001_ $$0P:(DE-HGF)0$$aJaegermann, Wolfram$$b5 000865074 773__ $$0PERI:(DE-600)2020854-6$$a10.1515/zpch-2019-1453$$gVol. 0, no. 0$$n6$$p1055$$tZeitschrift für physikalische Chemie$$v234$$x2196-7156$$y2020 000865074 8564_ $$uhttps://juser.fz-juelich.de/record/865074/files/Author%20version.pdf$$yOpenAccess$$zStatID:(DE-HGF)0510 000865074 8564_ $$uhttps://juser.fz-juelich.de/record/865074/files/Author%20version.pdf?subformat=pdfa$$xpdfa$$yOpenAccess$$zStatID:(DE-HGF)0510 000865074 8767_ $$8APC600097497$$92020-03-03$$d2020-03-03$$eHybrid-OA$$jZahlung erfolgt$$lKK: Barbers$$pZPC-19-1453$$zinkl. 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