Low-Pressure Vapor-Assisted Solution Process for Thiocyanate-Based Pseudohalide Perovskite Solar Cells

Yu Hsien Chiang, Hsin Min Cheng, Ming Hsien Li, Tzung Fang Guo, Peter Chen

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17 Citations (Scopus)

Abstract

In this report, we fabricated thiocyanate-based perovskite solar cells with low-pressure vapor-assisted solution process (LP-VASP) method. Photovoltaic performances are evaluated with detailed materials characterizations. Scanning electron microscopy images show that SCN-based perovskite films fabricated using LP-VASP have long-range uniform morphology and large grain sizes up to 1 μm. The XRD and Raman spectra were employed to observe the characteristic peaks for both SCN-based and pure CH3NH3PbI3 perovskite. We observed that the Pb(SCN)2 film transformed to PbI2 before the formation of perovskite film. X-ray photoemission spectra (XPS) show that only a small amount of S remained in the film. Using LP-VASP method, we fabricated SCN-based perovskite solar cells and achieved a power conversion efficiency of 12.72 %. It is worth noting that the price of Pb(SCN)2 is only 4 % of PbI2. These results demonstrate that pseudo-halide perovskites are promising materials for fabricating low-cost perovskite solar cells.

Original languageEnglish
Pages (from-to)2620-2627
Number of pages8
JournalChemSusChem
Volume9
Issue number18
DOIs
Publication statusPublished - 2016 Sep 22

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All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Chemical Engineering(all)
  • Materials Science(all)
  • Energy(all)

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