Excitons at the Phase Transition of 2D Hybrid Perovskites,ACS Photonics

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Excitons at the Phase Transition of 2D Hybrid Perovskites
ACS Photonics ( IF 6.5 ) Pub Date : 2022-10-18 , DOI: 10.1021/acsphotonics.2c01035
Jonas D. Ziegler _{1,

2} , Kai-Qiang Lin ₂ , Barbara Meisinger ₂ , Xiangzhou Zhu ₃ , Manuel Kober-Czerny ₄ , Pabitra K. Nayak _{4,

5} , Cecilia Vona ₆ , Takashi Taniguchi ₇ , Kenji Watanabe ₈ , Claudia Draxl ₆ , Henry J. Snaith ₄ , John M. Lupton ₂ , David A. Egger ₃ , Alexey Chernikov _{1,

2}

Affiliation

2D halide perovskites are among intensely studied materials platforms profiting from solution-based growth and chemical flexibility. They feature exceptionally strong interactions among electronic, optical, as well as vibrational excitations and hold a great potential for future optoelectronic applications. A key feature for these materials is the occurrence of structural phase transitions that can impact their functional properties, including the electronic band gap and optical response dominated by excitons. However, to what extent the phase transitions in 2D perovskites alter the fundamental exciton properties remains barely explored so far. Here, we study the influence of the phase transition on both exciton binding energy and exciton diffusion, demonstrating their robust nature across the phase transition. These findings are unexpected in view of the associated substantial changes of the free carrier masses, strongly contrast broadly considered effective mass and drift-diffusion transport mechanisms, highlighting the unusual nature of excitons in 2D perovskites.

中文翻译：

二维杂化钙钛矿相变中的激子

二维卤化物钙钛矿是经过深入研究的材料平台之一，受益于基于溶液的生长和化学灵活性。它们在电子、光学和振动激发之间具有异常强烈的相互作用，在未来的光电应用中具有巨大的潜力。这些材料的一个关键特征是结构相变的发生会影响它们的功能特性，包括电子带隙和由激子主导的光学响应。然而，到目前为止，二维钙钛矿中的相变在多大程度上改变了基本的激子特性仍然鲜有探索。在这里，我们研究了相变对激子结合能和激子扩散的影响，证明了它们在整个相变过程中的稳健性。

更新日期：2022-10-18

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