Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors
AuthorsAhmed, Ghada H.
Parida, Manas R.
Hedhili, Mohamed N.
Besong, Tabot M.D.
Mohammed, Omar F.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
KAUST Solar Center (KSC)
Imaging and Characterization Core Lab
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AbstractHybrid organic/inorganic perovskites have recently emerged as an important class of materials and have exhibited remarkable performance in photovoltaics. To further improve their device efficiency, an insightful understanding of the interfacial charge transfer (CT) process is required. Here, we report the first direct experimental observation of the tremendous effect that the shape of perovskite nanocrystals (NCs) has on interfacial CT in the presence of a molecular acceptor. A dramatic change in CT dynamics at the interfaces of three different NC shapes, spheres, platelets, and cubes, is recorded. Our results clearly demonstrate that the mechanism of CT is significantly affected by the NC shape. More importantly, the results demonstrate that complexation on the NC surface acts as an additional driving force not only to tune the CT dynamics but also to control the reaction mechanism at the interface. This observation opens a new venue for further developing perovskite NCs-based applications.
CitationAhmed GH, Liu J, Parida MR, Murali B, Bose R, et al. (2016) Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors. The Journal of Physical Chemistry Letters 7: 3913–3919. Available: http://dx.doi.org/10.1021/acs.jpclett.6b01910.
SponsorsThis work was supported by King Abdullah University of Science and Technology (KAUST) and the Islamic Development Bank (IDB). Also, part of this work was supported by Saudi Arabia Basic Industries Corporation (SABIC) Grant RGC/3/2470-01.
PublisherAmerican Chemical Society (ACS)