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Title: Cation influence on carrier dynamics in perovskite solar cells
Authors: Solanki, Ankur
Yadav, Pankaj
Turren-Cruz, Silver-Hamill
Lim, Swee Sien
Saliba, Michael
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2019
Source: Solanki, A., Yadav, P., Turren-Cruz, S.-H., Lim, S. S., Saliba, M., & Sum, T. C. (2019). Cation influence on carrier dynamics in perovskite solar cells. Nano Energy, 58, 604-611. doi:10.1016/j.nanoen.2019.01.060
Project: NTU SUG - M4080514
JSPS-NTU Joint Research Project M4082176
Journal: Nano Energy
Abstract: Rubidium and Cesium cations (Rb + and Cs + ) incorporation recently emerged as a viable strategy to enhance perovskite solar cells (PSCs) efficiency. However, a clear understanding of the impact of these cations on the structure-function relationship in relation to the device performance is severely lacking. Here, we systematically investigate the influence of Rb + and Cs + on the carrier dynamics using transient optical spectroscopy and correlate with solar cell performance. Unlike Rb + , Cs + integrates well with methylammonium (MA + ) and formamidinium (FA + ) yielding increased perovskite grain size, longer charge carrier lifetimes and improved power conversion efficiency (PCE). Concomitant incorporation of Cs + /Rb + cooperatively retards radiative recombination by ~60% in the quaternary-cation based perovskite system (RbCsMAFA) compared to the dual-cation MAFA samples. By suppressing the defect density, PCEs around 20% are obtained along with more balanced charge carrier diffusion length and comparable photoluminescence quantum yield in quaternary-cation perovskites. While the synergistic addition of Rb + and Cs + is attractive for controlling defects and recombination losses in efficient solar cells development, sole incorporation of Rb + is still an engineering challenge. Importantly, our study explicates the underlying mechanisms behind the synergistic combination of cations to minimize the charge carrier losses and achieve high efficiency perovskite solar cells.
ISSN: 2211-2855
DOI: 10.1016/j.nanoen.2019.01.060
DOI (Related Dataset):
Schools: School of Physical and Mathematical Sciences 
Rights: © 2019 Elsevier. All rights reserved. This paper was published in Nano Energy and is made available with permission of Elsevier.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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