Unraveling the high performance of tri-iodide perovskite absorber based photovoltaics with a non-polar solvent washing treatment

Kuen Feng Lin, Sheng Hsiung Chang, Kai Hung Wang, Hsin Ming Cheng, Kuo Yuan Chiu, Kun Mu Lee, Sheng Hui Chen, Chun Guey Wu

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

A comprehensive study was carried out to understand the formation of a crystalline tri-iodide perovskite absorber (TPA) on top of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Scanning electron microscopy, two-dimensional X-ray diffraction and nanosecond time-resolved photoluminescence were used to explore the correlation between the surface morphology and the exciton lifetime in TPA fabricated with and without the in-situ toluene washing treatment. The toluene washing treatment decreases the crystallinity (exciton lifetime) of TPA and improves the TPA coverage on the non-crystalline PEDOT:PSS surface. The high average power conversion efficiency (PCE) of 10.61% achieved can be explained as due to the efficient exciton dissociation at the interface between the TPA and the PEDOT:PSS. The experimental results show that the PCE can be further improved when the crystallinity of TPA and the TPA coverage on PEDOT:PSS are simultaneously optimized.

Original languageEnglish
Pages (from-to)309-314
Number of pages6
JournalSolar Energy Materials and Solar Cells
Volume141
DOIs
StatePublished - 23 Jun 2015

Keywords

  • 2D XRD
  • Photovoltaics
  • Tri-iodide perovskite film

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