Role of chloride in the morphological evolution of organo-lead halide perovskite thin films

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Spencer T. Williams
  • Fan Zuo
  • Chu-Chen Chueh
  • Chien-Yi Liao
  • Po-Wei Liang

Detail(s)

Original languageEnglish
Pages (from-to)10640-10654
Journal / PublicationACS Nano
Volume8
Issue number10
Online published6 Oct 2014
Publication statusPublished - 28 Oct 2014
Externally publishedYes

Abstract

A comprehensive morphological study was used to elucidate chlorides role in CH3NH3PbI3-xClx film evolution on a conducting polymer, PEDOT:PSS. Complex ion equilibria and aggregation in solution, as well as the role they play in nucleation, are found to ultimately be responsible for the unique morphological diversity observed in perovskite films grown in the presence of the chloride ion. An intermediate phase that is generated upon deposition and initial annealing templates continued self-assembly in the case of CH3NH3PbI3-xClx. In the absence of chloride, the film growth of CH3NH3PbI3 is directed by substrate interfacial energy. By employing the through-plane TEM analysis, we gain detailed insight into the unique crystallographic textures, grain structures, and elemental distributions across the breadth of films grown from precursor solutions with different chemistries. The lattice coherence seen in morphologies generated under the influence of chloride provides a physical rational for the enhancement in carrier diffusion length and lifetime.

Research Area(s)

  • chloride, crystallization mechanism, electron diffraction, perovskite, planar heterojunction

Citation Format(s)

Role of chloride in the morphological evolution of organo-lead halide perovskite thin films. / Williams, Spencer T.; Zuo, Fan; Chueh, Chu-Chen et al.
In: ACS Nano, Vol. 8, No. 10, 28.10.2014, p. 10640-10654.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review