Investigation of Charge Separation and Charge Injection Dynamics in Perovskite Solar Cells
Gwenole Jacopin a b, Jean-Daniel Ganiere a b, Benoit Deveaud a b, Mehran Shahmohammadi a b, Mahmoud Hezam a b c, Michael Gratzel d, Mohammad Khaja Nazeerudin d, Peng Qin d, Saif Qaid e, Abdullah Aldwayyan e, Idriss Bedja f
a Holst Centre, Solliance, NL, High Tech Campus, 21, Eindhoven, Netherlands
b King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh 11451
c Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 1145
d CRC, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433
International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Ecublens, Switzerland, 2014 May 11th - 14th
Organizers: Michael Graetzel and Mohammad Nazeeruddin
Oral, Mahmoud Hezam, presentation 226
Publication date: 1st March 2014

Perovskite-based solar cells are emerging as low cost and efficient light-to-electricity conversion devices. Understandingthe charge transfer dynamics at different time scales in the newly emerging perovskite solar cells is essential for further optimization. Here, we present our investigations on the charge separation and charge injection dynamics at the CH3NH3PbI3 perovskite/metal oxide interface by using time-resolved photoluminescence (TRPL) and laser flash photolysis measurements. TRPL results showed a clear and fast decay (~ 100 ps and ~ 1 ns decay times) that is almost independent of the metal oxide material (either TiO2 or Al2O3) at the interface [see the upper part of the figure], while the transient absorption signal continued to be detectable up to few milliseconds [bottom part of the figure]. The data indicate the fast separation of electron-hole pairs within the perovskite material, but electrons and holes are long-living after their separation. Low-temperature time-resolved as well as time-integrated PL measurements will be discussed in this presentation. The effect of perovskite deposition methods (namely sequential deposition and single-step spin coating) on the interfacial charge dynamics will also be highlighted. The data on the UV-damage and photostability of the perovskite material will also be discussed.

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