Hyperbranched TiO2 Electron Transporting Materials for Highly Efficient Perovskite and Dye-Sensitized Solar Cells

Khalid Mahmood^a, Aram Amassian^a, Bhabani Swain^b

^aKing Abdullah University of Science and Technology (KAUST) - Saudi Arabia, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia

^bSchool of Advanced Materials Engineering, Kookmin University, Seoul 136-702

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Khalid Mahmood, 293
Publication date: 5th February 2015

Hyperbranched TiO₂ electron transporting materials (ETMs) based on a three dimensional (3-D) hierarchical and hyperbranched nanorod-nanofiber array have been synthesized using a viable and scalable multi-stage electrospinning and hydrothermal synthesis route. These ETMs not only exhibit large surface area, but also rapid charge transport and reduced recombination, which are credited with remarkable enhancements of photovoltaic efficiency both in perovskite solar cells and dye sensitized solar cells. Perovskite solar cells were fabricated by employing a submicron layer of the hyperbranched arrays to yield a high power conversion efficiency (PCE) of 15.89%. DSSCs were fabricated based on a 29 µm thick multilayer hyperbranched array by extending the ETM fabrication process to larger thicknesses, yielding a maximum PCE of 11.22%, the highest so far achieved using N719-sensitized hyperbranched hierarchical TiO₂ ETM. These results demonstrate that hyperbranched nanofiber-nanorod ETMs have great potential in next generation photovoltaics, and may also benefit numerous other energy fields such as fuel cells, energy storage devices, photocatalysis and artificial photosynthesis.

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