Revealing the ultrafast charge carrier dynamics in organo metal halide perovskite solar cell materials using time resolved THz spectroscopy

Nanoscale
C S Ponseca, V Sundström

Abstract

Ultrafast charge carrier dynamics in organo metal halide perovskite has been probed using time resolved terahertz (THz) spectroscopy (TRTS). Current literature on its early time characteristics is unanimous: sub-ps charge carrier generation, highly mobile charges and very slow recombination rationalizing the exceptionally high power conversion efficiency for a solution processed solar cell material. Electron injection from MAPbI3 to nanoparticles (NP) of TiO2 is found to be sub-ps while Al2O3 NPs do not alter charge dynamics. Charge transfer to organic electrodes, Spiro-OMeTAD and PCBM, is sub-ps and few hundreds of ps respectively, which is influenced by the alignment of energy bands. It is surmised that minimizing defects/trap states is key in optimizing charge carrier extraction from these materials.

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Citations

Jun 1, 2016·ACS Nano·Shrabani PanigrahiElvira Fortunato
Jun 22, 2016·Chemical Reviews·Joseph S ManserPrashant V Kamat
Apr 12, 2018·Chemical Communications : Chem Comm·Somnath BiswasL Robert Baker
May 31, 2018·Advanced Materials·Simon A BretschneiderMischa Bonn
Oct 22, 2019·Advanced Materials·Christian M WolffDieter Neher
Oct 24, 2020·Physical Chemistry Chemical Physics : PCCP·Qihao SunYadong Xu
Aug 15, 2017·Chemical Reviews·Carlito S PonsecaVilly Sundström
Oct 4, 2018·The Journal of Physical Chemistry Letters·Yuan Ping, Jin Zhong Zhang

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