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ChemSusChem v.9 no.20, 2016년, pp.2994 - 3004   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Vibrational Response of Methylammonium Lead Iodide: From Cation Dynamics to Phonon–Phonon Interactions

Ivanovska, Tanja (Institute of Nanostructured Materials (ISMN), National Research Council (CNR), Via Gobetti 101, 40129, Bologna, Italy<country scheme="USMARC"> ); Quarti, Claudio (it</country> ); Grancini, Giulia (Laboratory for Chemistry of Novel Materials, Universitè ); Petrozza, Annamaria (de Mons, Place du Park 20, 7000, Mons, Belgium<country scheme="USMARC"> ); De Angelis, Filippo (be</country> ); Milani, Alberto (Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Federale de Lausanne, CH-1951, Sion, Switzerland<country scheme="USMARC"> ); Ruani, Giampiero (sz</country> );
  • 초록  

    Abstract The dynamic evolution of the vibrational interactions in the prototypical CH 3 NH 3 PbI 3 was studied through a comprehensive experimental and theoretical investigation with a focus on the interactions between the organic cations and the inorganic cage. To date, no clear picture has emerged on the critical and fundamental interactions between the two perovskite components, despite the relevance of phonons to the electronic properties of several classes of perovskites. For the first time, we have monitored the IR and nonresonant Raman response in the broad frequency range 30–3400 cm −1 and in the temperature interval 80–360 K. Strong changes in the energies of different vibrational modes with temperature are observed and examined in the framework of phonon–phonon interactions considering a significant anharmonic contribution to the phonon relaxation process. The vibrational relaxation of the bending modes and their reorientation activation energies identify that such mechanisms are governed by medium‐to‐strong hydrogen bonds in the orthorhombic phase; however, any ferroelectric ordering in the orthorhombic phase is governed mostly by dipole interactions. These changes imply that charge localization mechanisms play a primary role, and our study enriches the fundamental knowledge of phonon interactions and charge transport in CH 3 NH 3 PbI 3 for the further development of optoelectronic applications.


  • 주제어

    density functional calculations .   lead .   perovskites .   raman spectroscopy .   vibrational spectroscopy.  

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