Slow Processes in Planar Perovskite Solar Cells - Microseconds, Milliseconds and Minutes
Laurie Peter a, Petra Cameron a, Adam Pockett b, Henry Snaith c, Giles Eperon c
a SPECIFC, Port Talbot, SA12 7AX, United Kingdom
b University of Oxford, Clarendon Laboratory, Parks rd, Oxford, 0, United Kingdom
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Invited Speaker Session, Petra Cameron, presentation 189
Publication date: 28th March 2016

Perovskite solar cells have now reached impressive certified efficiencies of 22.1% [KRICT]1. Efficient cells have been now been prepared using several lead halide perovskites and a wide variety of electron and hole conducting contacts. In the race to make ever more efficient cells, thorough device characterisation is lagging behind materials development. There are many open questions remaining, not least issues around hysteresis and the slow rise in open circuit photovoltage (it can take tens of minutes at room temperature) to its maximum value. It is probable that mobile ions (in particular iodide) are responsible for many of the effects.2,3

We have been working on characterising planar perovskite solar cells, fabricated in Oxford, using a range of techniques including IMVS and large amplitude voltage transients. We previously reported the impedance and Voc decay of planar cells. It was shown that, in contrast to Dye Sensitized Solar Cells, it is not possible to obtain information about electron-hole recombination in PSC using these techniques.4 We have continued our investigation of planar cells and in this presentation the characteristic responses that we measure for PSC (on the microsecond, millisecond and minute time scales) will be discussed and attributed to physical processes within the device.

1. http://www.nrel.gov/ncpv/images/efficiency_chart.jpg.  2. C. Eames, J. M. Frost, P. R. F. Barnes, B. C. O/'Regan, A. Walsh and M. S. Islam, Nat Commun, 2015, 6. 3. G. Richardson, S. E. J. O'Kane, R. G. Niemann, T. A. Peltola, J. M. Foster, P. J. Cameron and A. B. Walker, Energy Environ. Sci., 2016. 4. A. Pockett, G. E. Eperon, T. Peltola, H. J. Snaith, A. Walker, L. M. Peter and P. J. Cameron, The Journal of Physical Chemistry C, 2015, 119, 3456-3465.



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