Overcoming ultraviolet light instability of sensitized TiO2 with meso-superstructured organometal tri-halide perovskite solar cells

Tomas Leijtens, Giles E. Eperon, Sandeep Pathak, Antonio Abate, Michael M. Lee and Henry J. Snaith ()
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Tomas Leijtens: University of Oxford, Clarendon Laboratory
Giles E. Eperon: University of Oxford, Clarendon Laboratory
Sandeep Pathak: University of Cambridge, Cavendish Laboratory
Antonio Abate: University of Oxford, Clarendon Laboratory
Michael M. Lee: University of Oxford, Clarendon Laboratory
Henry J. Snaith: University of Oxford, Clarendon Laboratory

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract The power conversion efficiency of hybrid solid-state solar cells has more than doubled from 7 to 15% over the past year. This is largely as a result of the incorporation of organometallic trihalide perovskite absorbers into these devices. But, as promising as this development is, long-term operational stability is just as important as initial conversion efficiency when it comes to the development of practical solid-state solar cells. Here we identify a critical instability in mesoporous TiO2-sensitized solar cells arising from light-induced desorption of surface-adsorbed oxygen. We show that this instability does not arise in mesoporous TiO2-free mesosuperstructured solar cells. Moreover, our TiO2-free cells deliver stable photocurrent for over 1,000 h continuous exposure and operation under full spectrum simulated sunlight.

Date: 2013
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DOI: 10.1038/ncomms3885

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