Photo-physical Properties of Bromide-Iodide Mixed-Halide Organolead Perovskite Semiconductors

SiânE. Duttonand ^a, Richard H. Friend^a, Aditya Sadhanala^a, Felix Deschler^a

^aUniversity of Cambridge - UK, The Old Schools, Trinity Ln, Cambridge CB2 1TN, UK, Cambridge, 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, Aditya Sadhanala, 280
Publication date: 5th February 2015

Solution processable hybrid perovskite semiconductor materials have been demonstrated to give excellent photovoltaic (PV) power conversion efficiencies,now exceeding 19%.[1–3]The family of the mixed halide perovskites,CH3NH3Pb(I1-xBrx)3 (0 ≤ x ≤ 1), have attracted special attention due to their easy bandgap tunability and good performance in PVs and light emitting diodes (LED).[4–6]Although decent power conversion efficiencies have been achieved from these perovskite PVs, the fundamental issue of open circuit voltage losses compared to the pure tri-halide perovskite based PVs,is not resolved. In addition, the effect of halide ratio on the recombination properties in this family of perovskites is still largely unexplored. We study the steady-state and photo-induced changesin these iodide-bromide perovskites CH3NH3Pb(I1-xBrx)3 (0 ≤ x ≤ 1) using photothermal deflection spectroscopy, transient absorption,transientphotoluminescence and X-ray diffraction measurements.[7] We find changes in the absorption and recombination behavior of the photo-excitedstates in these materials under background white light illumination.These changes provide an insight into the under-performance of the solar cells based on these perovskite solid solutions and provide alternate applications of their unique properties in new optoelectronic devices.

[1] M. M. Lee, J. Teuscher, T. Miyasaka, T. N. Murakami, H. J. Snaith, Science2012, 338, 643. [2] M. A. Green, A. Ho-Baillie, H. J. Snaith, Nat. Photonics2014, 8, 506. [3] H. Zhou, Q. Chen, G. Li, S. Luo, T. Song, H.-S. Duan, Z. Hong, J. You, Y. Liu, Y. Yang, Science2014, 345, 542. [4] Z.-K. Tan, R. S. Moghaddam, M. L. Lai, P. Docampo, R. Higler, F. Deschler, M. Price, A. Sadhanala, L. M. Pazos, D. Credgington, F. Hanusch, T. Bein, H. J. Snaith, R. H. Friend, Nat. Nanotechnol.2014, 9, 687. [5] G. E. Eperon, S. D. Stranks, C. Menelaou, M. B. Johnston, L. M. Herz, H. J. Snaith, Energy Environ. Sci.2014, 7, 982. [6] J. H. Noh, S. H. Im, J. H. Heo, T. N. Mandal, S. Il Seok, Nano Lett.2013, 13, 1764. [7] A. Sadhanala, F. Deschler, T. H. Thomas, S. E. Dutton, K. C. Goedel, F. C. Hanusch, M. L. Lai, U. Steiner, T. Bein, P. Docampo, D. Cahen, R. H. Friend, J. Phys. Chem. Lett.2014, 5, 2501.

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