Coherent Phonon-Induced Modulation of Charge Transfer in 2D Hybrid Perovskites

Dovletgeldi Seyitliyev; Xixi Qin; Manoj K. JanaSvenja M. JankeXiaowei ZhongWei YouDavid B. MitziVolker BlumKenan Gundogdu

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Coherent Phonon-Induced Modulation of Charge Transfer in 2D Hybrid Perovskites

机译：Coherent Phonon-Induced Modulation of Charge Transfer in 2D Hybrid Perovskites

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Electron–phonon interactions play an essential role in charge transport and transfer processes in semiconductors. For most structures, tailoring electron– phonon interactions for specific functionality remains elusive. Here, it is shown that, in hybrid perovskites, coherent phonon modes can be used to manipulate charge transfer. In the 2D double perovskite, (AE2T)_2AgBiI_8 (AE2T: 5,5“-diylbis(amino-ethyl)-(2,2”-(2)thiophene)), the valence band maximum derived from the [Ag_(0.5)Bi_(0.5)I_4]~(2-) framework lies in close proximity to the AE2Tderived HOMO level, thereby forming a type-II heterostructure. During transient absorption spectroscopy, pulsed excitation creates sustained coherent phonon modes, which periodically modulate the associated electronic levels. Thus, the energy offset at the organic–inorganic interface also oscillates periodically, providing a unique opportunity for modulation of interfacial charge transfer. Density-functional theory corroborates the mechanism and identifies specific phonon modes as likely drivers of the coherent charge transfer. These observations are a striking example of how electron–phonon interactions can be used to manipulate fundamentally important charge and energy transfer processes in hybrid perovskites.

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《Advanced functional materials》 |2023年第21期|2213021.1-2213021.12|共12页
作者
Dovletgeldi Seyitliyev; Xixi Qin; Manoj K. JanaSvenja M. JankeXiaowei ZhongWei YouDavid B. MitziVolker BlumKenan Gundogdu;
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Department of Physics and Organic and Carbon Electronics Laboratories (ORaCEL) North Carolina State University Raleigh, NC 27695, USA;

University Program in Materials Science and Engineering Duke University Durham, NC 27708, USA,Thomas Lord Department of Mechanical Engineering and Materials Science Duke University Durham, NC 27708, USA;

Thomas Lord Department of Mechanical Engineering and Materials Science Duke University Durham, NC 27708, USADepartment of Chemistry University of North Carolina Chapel Hill, NC 27599, USAUniversity Program in Materials Science and Engineering Duke University Durham, NC 27708, USA,Thomas Lord Department of Mechanical Engineering and Materials Science Duke University Durham, NC 27708, USA,Department of Chemistry Duke University Durham, NC 2;

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coherent phonons; charge transfer; hybrid perovskites; density functional theory;

Coherent Phonon-Induced Modulation of Charge Transfer in 2D Hybrid Perovskites

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