Improving TiO2 properties through Nd-doping

Bart Roose^a, Ullrich Steiner^a, Antonio Abate^a^,^d, Karl Gödel^b, Sandeep Pathak^c

^aAdolphe Merkle Institute, Rue des Verdiers, CH-1700 Fribourg

^bDepartment of Physics, University of Cambridge, JJ Thompson Avenue, Cambridge, CB3 0HE, United Kingdom

^cDepartment of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

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, Bart Roose, 036
Publication date: 5th February 2015

Titanium dioxide (TiO₂) is the most widely used material for hole blocking and mesoporous layers in perovskite and dye sensitized solar cells. During synthesis many defects arise in the TiO₂lattice. Some defects are beneficial for charge transport, while others retard charge transport and increase recombination. A widely adopted method to control defect states in TiO₂ is doping; the deliberate introduction of impurities. A wide range of metals and non-metals has been explored for dye sensitized solar cells, achieving marked improvements in photocurrent and voltage. In previous work we showed aluminium doping of the TiO₂hole blocking layer not only significantly enhances photocurrent, but results in improved device stability as well through the elimination of oxygen vacancies [1]. In this work we investigated the effect of doping mesoporous TiO₂ with the lanthanide neodymium. We expect to find similar trends in performance and stability enhancement. In addition the 4f energy levels of lanthanides are expected to significantly affect the conduction band of TiO₂, offering the possibility of further enhancement of photocurrent and voltage.

[1]Pathak, S. K.; Abate, A.; Ruckdeschel, P.; Roose, B. Gödel, K. C.; Vaynzof, Y.; Sadhanala, A.; Watanabe, S.-I.; Hollman, D. J.; Noel, N.; Sepe, A.; Wiesner, U.; Friend, Richard.; Snaith, H. J.; Steiner, U. Performance and Stability Enhancement of Dye-Sensitized and Perovskite Solar Cells by Al Doping of TiO2. Advanced Functional Materials 2014, 24, 6046-6055

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