Solvent-assisted crystallization via a delayed-annealing approach for highly efficient hybrid mesoscopic/planar perovskite solar cells

Albertus Adrian Sutanto, Shiang Lan, Chih Fu Cheng, Sandeep B. Mane, Hui Ping Wu, Mario Leonardus, Meng Yu Xie, Shih Chieh Yeh, Chiao Wei Tseng, Chin Ti Chen, Wei-Guang Diau*, Chen Hsiung Hung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The formation of a dense and uniform perovskite film with large grain is an important factor for getting excellent device performance. Here, we report an optimized solvent-assisted crystallization procedure followed by a delayed annealing for easy and reproducible fabrications of perovskite solar cells with a hybrid mesoscopic configuration. The working electrode contains a mesoporous TiO2 scaffold layer of 100 nm deposited on FTO substrate with a thin TiO2 blocking layer. The devices in this study were assembled using all commercially available materials without any extensive modification. Formation of uniform and pin-hole free perovskite nanocrystals with film thickness 200 nm on top of the scaffold layer was achieved via an optimized solvent-assisted crystallization method. A much smoother perovskite layer was achieved with a delayed annealing for a certain period. The best performing device was obtained at the annealing delayed for 60 min, giving the power conversion efficiency 16.9% with an average value 15.4% obtained from 60 devices.

Original languageEnglish
Pages (from-to)270-276
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume172
DOIs
StatePublished - 1 Dec 2017

Keywords

  • Delayed annealing
  • Hybrid mesoscopic
  • Perovskite morphology
  • Perovskite solar cells
  • Solvent assisted crystallization

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