Optical Properties of Two-Dimensional Perovskite Films of (C6H5C2H4NH3)2[PbI4] and (C6H5C2H4NH3)2 (CH3NH3)2[Pb3I10]

Yaxin Zhai, Yang Zhang, Ruizhi Wang, Yezhou Li, Zeyang Wang, Shu Hu, Xiaoliang Yan, Chuang Zhang, ChuanXiang Sheng

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Abstract

The temperature dependence of absorption and photoluminescence (PL) spectroscopies were used to study the optical properties of 2D perovskite films, including n = 1 and 3 of (PEA)2(CH3NH3)n-1[PbnI3n+1] (PEA = C6H5(CH2)2NH3). In (PEA)2[Pb1I4] (PEPI), excitons coupling to optical phonons with an average energy of ~30 meV dominate the photophysics of absorption and PL. (PEA)2(CH3NH3)2[Pb3I10] (shortened as PMPI3), nominally prepared as n = 3, actually was a mixture of multiple layered perovskites with various n. In absorption, a PMPI3 film presents respective n materials' excitonic features, coupling to phonons with an average energy of ~30 meV; in analyzing PL peaked singly at ~1.6 eV and its width as a function of temperature, we found that PMPI3 behaves like PEPI at around 80 K but like 3D perovskite near room temperature, with three times larger electron-phonon interaction strength compared to that in PEPI.
Original languageAmerican English
Pages (from-to)13-19
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume10
Issue number1
DOIs
StatePublished - 2019

NREL Publication Number

  • NREL/JA-5900-73217

Keywords

  • absorption
  • optical properties
  • perovskite films
  • photoluminescence
  • temperature dependence

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