Graham Laboratory at the University of Kentucky

Key points: Strong intermolecular interactions in the organic layer, low steric hindrance around the ammonium group, horizontally oriented inorganic sheets, and high hydrophobicity all lead to increased stability.

Effects of A-Site Cation Structure on the Stability of 2D Tin Halide Perovskites Two-dimensional halide perovskites (2D-HPs) are of significant interest for their applications in optoelectronic devices. Part of this increased interest in 2D-HPs stems from their increased stability...

Increasing the stability of organic metal halide perovskites remains a major challenges. Led by Tareq Hossain, we show how the ammonium cation structure can be used to increase stability in 2D tin halide perovskites: pubs.acs.org/doi/10.1021/...

Congratulations to Augustine Yusuf for leading the work and thanks to MRS Communications for including Ken Graham as an Early Career Distinguished Presenter at the 2023 Fall MRS Meeting.

The influence of anion size on the thermoelectric properties and Seebeck coefficient inversion in PDPP-4T - MRS Communications Recent findings show that the Seebeck coefficient (S) can undergo a sign inversion at high doping concentrations in certain π-conjugated polymers. This work investigates how the counterion size influe...

The counterion can significantly influence the electronic and thermoelectric properties of doped conjugated polymers. Here, we show that the counterion size plays a role in determining whether the Seebeck coefficient changes sign upon heavy doping. link.springer.com/article/10.1...

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