Effects of anti-solvent (iodobenzene) volume on the formation of CH 3 NH 3 PbI 3 thin films and their application in photovoltaic cells

Sheng Hsiung Chang, Wei Chen Huang, Cheng Chiang Chen, Sheng Hui Chen, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

An antisolvent (iodobenzene, IB) was used to assist the formation of closely packed CH 3 NH 3 PbI 3 (MAPbI 3 ) thin films during the one-step spin-coating process using different volumes of IB. The morphological, structural, optical and excitonic properties of MAPbI 3 thin films were analyzed using a contact-mode atomic-force microscope, X-ray diffractometer, broadband absorbance spectrometer and optical microscope-based time-resolved photoluminescence spectrometer. The properties of the resultant MAPbI 3 thin films can be manipulated by using different IB volumes, which dominates the device performance of MAPbI 3 based photovoltaic cells. The experimental results show that the grain size (or particle size) of MAPbI 3 thin films influences the collection of photoexcited carriers and the contact at the 6,6-Phenyl C 61 butyric acid methyl ester (PCBM)/MAPbI 3 interface, thereby resulting in a trade-off between the fill factor (FF) and short-circuit current density (J SC ). In addition, it is predicted that the power conversion efficiency (PCE) can be further improved by increasing the crystallinity of the MAPbI 3 thin film while keeping the small grain size.

Original languageEnglish
Pages (from-to)24-29
Number of pages6
JournalApplied Surface Science
Volume445
DOIs
StatePublished - 1 Jul 2018

Keywords

  • Antisovlents
  • CH NH PbI
  • Nucleation and crystal growth
  • Photovoltaics

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