Hyperbranched TiO2 Electron Transporting Materials for Highly Efficient Hybrid Photovoltaics

Aram Amassian^a, Khalid Mahmood^a, Bhabani Sankar 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

Oral, Aram Amassian, presentation 199
Publication date: 5th February 2015

Hyperbranched three-dimensional (3-D) TiO₂ electron transporting materials (ETMs) based on a three dimensional (3-D) hierarchical nanorod-nanofiber array have been synthesized using a viable 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 enhancement of photovoltaic efficiency both in perovskite 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 15.50%. DSSCs were fabricated based on a 29 µm thick multilayer 3-D hyperbranched array, yielding a maximum PCE of 11.22%, the highest so far achieved using N719-sensitized hyperbranched hierarchical TiO₂ photoelectrodes. These results demonstrate that 3-D 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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