BAR-ILAN INSTITUTE OF NANOTECHNOLOGY & ADVANCED MATERIALS | 2019 ANNUAL REPORT

94 • Low cost spectral splitting for multi- bandgap photovoltaics • Interdigitated organic/inorganic nanosize layers towards the development of low cost “plastic” solar cells and smart polymers Abstract The Cahen-Zaban group studies (opto) electronic materials, esp. for Photovoltaics. A major tool is combinatorial material science to answer renewable energy’s need for new materials, i.e., to explore compounds with unique characteristics with current focus on halide perovskites and charge-selective metal oxides. Further interests are in Biomolecules, esp. proteins as electronic materials for future bioelectronics. Work-flow diagram of the combinatorial material science scheme Publications 2018 and 2019 • Kevin J Rietwyk, David A Keller, Adam Ginsburg, Hannah ѧ Noa Barad, Maayan Priel, Koushik Majhi, Zhi Yan, Shay Tirosh, Assaf Y Anderson, Lothar Ley, Arie Zaban, “Universal Work Function of Metal Oxides Exposed to Air”, Advanced Materials Interfaces, volume 6, issue 12, 1802058, 2019 . • Shay Tirosh, Niv Aloni, Simcha Meir, Arie Zaban, David Cahen, and Diana Golodnitsky, “FTO Darkening Rate as a Qualitative, High-Throughput Mapping Method for Screening Li-Ionic Conduction in Thin Solid Electrolytes”, ACS Combinatorial Science, 2019 . • H.-N. Barad et al., “How Transparent Oxides Gain Some Color: Discovery of a CeNiO 3 Reduced Bandgap Phase As an Absorber for Photovoltaics,” ACS Comb. Sci., p. acscombsci.8b00031, May 2018 . • D. A. Keller et al., “Oxygen concentration as a combinatorial parameter: The effect of continuous oxygen vacancy variation on SnO 2 layer conductivity,” Mater. Chem. Phys., vol. 208, pp. 289–293, 2018 . • DA Keller, HN Barad, E Rosh-Hodesh, A Zaban, D Cahen, “Can fluorine-doped tin Oxide, FTO, be more like indium-doped tin oxide, ITO? Reducing FTO surface roughness by introducing additional SnO2 coating”, MRS Communications 8 (3), 1358-1362, 2018 . • A Sahu, S Tirosh, KR Hiremath, A Zaban, A Dixit, “A novel process for sensitization and infiltration of quantum dots in mesoporous metal oxide matrix for efficient solar photovoltaics response”, Solar Energy 169, 488-497, 2018 . • A Ginsburg, M Priel, HN Barad, DA Keller, E Borvick, K Rietwyk, A Kama, S Meir, AY Anderson, A Zaban, “Solid state ITO | Au-NPs | TiO 2 plasmonic based solar cells”, Solar Energy Materials and Solar Cells 179, 254-259, 2018 . Prof. Avi Zadok Faculty of Engineering Member of BINA, Nano-Photonics Center Research Areas • Fiber optics sensing • Silicon Photonics • Nonlinear Optics • Wafer Bonding • Optical Communication Abstract Nano-Photonic Devices in Silicon and Glass The research group of Prof. Avi Zadok works in the analysis, design, fabrication and characterization of photonic devices. Specific objectives include silicon-photonic filters for wavelength-division multiplexing of optical communication channels for data centers; wafer bonding of InP-based active layers on top of silicon waveguides; Four-wave mixing and Brillouin scattering effects in glass waveguides; and the introduction of surface-acoustic waves to silicon-photonic circuits. In addition, the group also studies fiber-optic sensors, and opto-mechanics of optical fibers. Surface acoustic wave-photonic devices. Modulated pump light from the output facet of an optical fibre is incident upon a gold grating.. The resulting strain pattern is transferred onto the underlying device layer of a silicon on insulator substrate. The strain pattern is periodic in time according to the modulation of the pump wave, and in space according to the grating pattern. A race-track resonator waveguide is defined in the silicon device layer, in proximity to the grating. The surface waves induce photo-elastic modulation to the effective index of the optical mode in the face-track waveguide. An optical probe wave, with a frequency that matches a slope of the resonator transfer function, is coupled into the waveguide. Photo-elastic perturbations due to surface acoustic waves induce intensity modulation of the optical probe wave. Publications 2018 and 2019 • HH Diamandi, A Zadok, “Ultra-narrowband integrated Brillouin laser”, Nature Photonics 13 (1), 9, 2019 . • HH Diamandi, Y London, G Bashan, A Zadok, “Distributed opto-mechanical analysis of liquids outside standard fibers coated with polyimide”, APL Photonics 4 (1), 016105, 2019 . • L Thévenaz, M Tur, M Gonzalez-Herraez, A Zadok, MA Soto, “Guest Editorial JLT Special Issue on OFS-26”, Journal of Lightwave Technology, 37 (18), 4455-4455, 2019 . • D Munk, M Katzman, M Hen, M Priel, M Feldberg, T Sharabani, S Levy, A Bergman, A Zadok, “Surface acoustic wave photonic devices in silicon on insulator”, Nature communications 10 (1), 1-9, 2019 . • D. Munk et al., “Four-wave mixing and nonlinear parameter measurement in a gallium-nitride ridge waveguide,” Opt. Mater. Express, vol. 8, no. 1, p. 66, 2018 . • Y London, HH Diamandi, G Bashan, A Zadok, “Invited Article: Distributed analysis of nonlinear wave mixing in fiber due to forward Brillouin scattering and Kerr effects”, APL Photonics 3 (11), 110804, 2018 .