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Optical detection of charge dynamics in CH3NH3PbI3/carbon nanotube composites

Abstract

We have investigated the optical absorption of metallic and semiconducting carbon nanotubes/CH3NH3PbI3 micro- and nanowire composites. Upon visible light illumination semiconducting carbon nanotube based samples show a photo-induced doping, originating from the charge carriers created in the perovskite while this kind of change is absent in the composites containing metallic nanotubes, due to their strikingly different electronic structure. The response in the nanotubes shows, beside a fast diffusion of photo-generated charges, a slow component similar to that observed in pristine CH3NH3PbI3 attributed to structural rearrangement, and leading to slight, light induced changes of the optical gap of the perovskite. This charge transfer from the illuminated perovskite confirms that carbon nanotubes (especially semiconducting ones) can form efficient charge-transporting layers in the novel organometallic perovskite based optoelectronic devices.

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Publication details

The article was received on 17 Aug 2017, accepted on 25 Sep 2017 and first published on 27 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06136F
Citation: Nanoscale, 2017, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Optical detection of charge dynamics in CH3NH3PbI3/carbon nanotube composites

    H. Tohati, A. Pekker, P. Andričević, L. Forro, B. Náfrádi , M. Kollár, E. Horvath and K. Kamaras, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06136F

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