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Title: Modulating Carrier Dynamics through Perovskite Film Engineering
Authors: Lim, Swee Sien
Chong, Wee Kiang
Solanki, Ankur
Dewi, Herlina Arianita
Mhaisalkar, Subodh Gautam
Mathews, Nripan
Sum, Tze Chien
Keywords: Thin films
Issue Date: 2016
Source: Lim, S. S., Chong, W. K., Solanki, A., Dewi, H. A., Mhaisalkar, S. G., Mathews, N., et al. (2016). Physical Chemistry Chemical Physics, in press.
Series/Report no.: Physical Chemistry Chemical Physics
Abstract: Precise morphological control in perovskite films is key to high performance photovoltaic and light emitting devices. However, a clear understanding of the interplay of morphological effects from substrate/perovskite antisolvent treatments on the charge dynamics is still severely lacking. Through detailed ultrafast optical spectroscopy, we correlate the morphology-kinetics relationship in a combination of substrate/film treated samples (i.e., plasma-cleaned vs piranha-etched substrates and solvent (toluene)-engineered (or toluene anti-solvent treated) perovskite films). Our findings reveal that toluene-dripped treatment has a more pronounced influence on the morphology of perovskite films prepared on plasma-cleaned substrates over those on piranha-etched substrates. Surprisingly, the highly effective toluene-dripping/washing approach reported in the literature increases the surface trap densities of perovskite films. Despite the marked improvements in the surface morphology of the toluene-dripped films, there is only a slight improvement in the carrier relaxation lifetimes – likely due to the competition between the morphology improvements and the increased surface traps densities. In addition, the injection of photoexcited holes to spiro-OMeTAD from toluene-dripped films on piranha-etched substrates is inhibited, possibly due to a realignment of the energy bands. Nonetheless, piranha-etching of the substrates could possibly offer an approach to improve the balance between the electron and hole diffusion lengths in the perovskite film. Importantly, our findings would help unravel the complex relationship of substrate/film treatments on the morphology and charge kinetics in perovskite thin films.
ISSN: 1463-9076
DOI: 10.1039/C6CP02640K
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2016 The Author(s) (Royal Society of Chemistry). This is the author created version of a work that has been peer reviewed and accepted for publication by Physical Chemistry Chemical Physics, The Author(s) (Royal Society of Chemistry). It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
IGS Journal Articles
MSE Journal Articles
SPMS Journal Articles

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