Adi Cohen

Noncollinear Electric Dipoles in a Polar Chiral Phase of CsSnBr3 Perovskite

Douglas H. Fabini, Kedar Honasoge, Adi Cohen, Sebastian Bette et autres

or its neighboring solid solutions as candidates for bulk Rashba effects.

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Disentangling the effects of structure and lone-pair electrons in the lattice dynamics of halide perovskites

Sebastián Caicedo‐Dávila, Adi Cohen, Silvia G. Motti, Masahiko Isobe et autres

Abstract Halide perovskites show great optoelectronic performance, but their favorable properties are paired with unusually strong anharmonicity. It was proposed that this combination derives from the n s 2 electron configuration of octahedral cations and associated pseudo-Jahn–Teller effect. We show that such …

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The Critical Role of Anharmonic Lattice Dynamics for Macroscopic Properties of the Visible Light Absorbing Nitride Semiconductor CuTaN2 (Adv. Energy Mater. 19/2024)

Franziska Simone Hegner, Adi Cohen, Stefan S. Rudel, Silva M. Kronawitter et autres

Solar Energy Harvesting In article number 2303059, Omer Yaffe, Ian D. Sharp, David A. Egger, and co-workers uncover pronounced anharmonic vibrational effects in the ternary nitride semiconductor, CuTaN2. These dynamic structural characteristics are found to have a large impact on the fundamental …

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The Critical Role of Anharmonic Lattice Dynamics for Macroscopic Properties of the Visible Light Absorbing Nitride Semiconductor CuTaN 2

Franziska Simone Hegner, Adi Cohen, Stefan S. Rudel, Silva M. Kronawitter et autres

Abstract Ternary nitride semiconductors are rapidly emerging as a promising class of materials for energy conversion applications, offering an appealing combination of strong light absorption in the visible range, desirable charge transport characteristics, and good chemical stability. In this work, it is …

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Noncollinear electric dipoles in a polar, chiral phase of CsSnBr$_3$ perovskite

Douglas H. Fabini, Kedar Honasoge, Adi Cohen, Sebastian Bette et autres

Polar and chiral crystal symmetries confer a variety of potentially useful functionalities upon solids by coupling otherwise noninteracting mechanical, electronic, optical, and magnetic degrees of freedom. We describe two unstudied phases of the 3D perovskite, CsSnBr$_3$, which emerge below 85 K due …

Disentangling the Effects of Structure and Lone-Pair Electrons in the Lattice Dynamics of Halide Perovskites

Sebastián Caicedo‐Dávila, Adi Cohen, Silvia G. Motti, Masahiko Isobe et autres

Metal halide perovskites have shown great performance as solar energy materials, but their outstanding optoelectronic properties are paired with unusually strong anharmonic effects. It has been proposed that this intriguing combination of properties derives from the "lone pair" 6$s^2$ electron configuration of …

Mechanistic View on the Order–Disorder Phase Transition in Amphidynamic Crystals

Maor Asher, Marco Bardini, Luca Catalano, Rémy Jouclas et autres

High Resolution Image Download MS PowerPoint Slide We combine temperature-dependent low-frequency Raman measurements and first-principles calculations to obtain a mechanistic understanding of the order–disorder phase transition of 2,7-di- tert -butylbenzo[ b ]benzo[4,5]thieno[2,3 -d ]thiophene (ditBu-BTBT) and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) semiconducting amphidynamic crystals. …

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Diverging Expressions of Anharmonicity in Halide Perovskites

Adi Cohen, Thomas M. Brenner, Johan Klarbring, Rituraj Sharma et autres

Abstract Lead‐based halide perovskite crystals are shown to have strongly anharmonic structural dynamics. This behavior is important because it may be the origin of their exceptional photovoltaic properties. The double perovskite, Cs2AgBiBr6, has been recently studied as a lead‐free alternative for optoelectronic …

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