Charge carrier dynamics of additive-engineered organic-inorganic hybrid perovskites
Satakshi Gupta a b, Paul Burn a, Paul Shaw a, Sunil Kumar b
a The University of Queensland, Centre for Organic Photonics & Electronics (COPE), School of Chemistry and Molecular Biosciences and School of Mathematics and Physics, Brisbane 4072, Australia
b Femtosecond Spectroscopy and Nonlinear Photonics Laboratory, Department of Physics, Indian Institute of Technology Delhi
Pending, Satakshi Gupta, presentation 093
Publication date: 6th February 2024

The swift advancement of perovskite solar cell technology positions them as compelling contenders for the next wave of thin film photovoltaic devices, whether utilized as standalone solar cells or integrated into tandem structures with silicon modules etc. The appeal of perovskite solar cells stems from their facile processing conditions, tuneable properties, and high efficiency. Additive engineering has proved to be an impeccable technique to augment their stability and optimize performance. However, the impact of the additives on the fundamental mechanisms governing charge carrier generation and recombination is still ambiguous.

In this presentation, I will discuss the study of fluorinated additives on the carrier dynamics of hybrid perovskite films through ultrafast spectroscopy. In our previous investigation, these additives tended to phase separate during the deposition process, concentrating at the surface of the perovskite film. We, therefore, probed the surface and bulk of the film using transient reflectance and transmission measurements. The Maximum Entropy Method (MEM) was used to obtain a lifetime distribution and the most probable model was used for fitting the decay kinetics. The investigation revealed that the presence of the additive at a low concentration led to faster recombination occurring near the film surface. The correlation of these kinetics to the device performance will also be discussed.

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