Highly Stable Perovskite Solar Cells Fabricated under Humid Ambient Conditions

Barbara Andrade De Carvalho, Shalinee Kavadiya, Su Huang, Dariusz M. Niedzwiedzki, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Organometallic perovskite solar cells have gained immense attention due to their rapid increase in efficiency and compatibility with low-cost fabrication methods. However, the material's instability in humid ambient conditions has remained a key challenge for the large-scale fabrication and application of such cells. In this paper, we present devices fabricated under 50% humidity with significantly improved long-term stability through three parallel approaches. First, the small molecule hole transport material, 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-MeOTAD) is replaced by a polymeric material Poly(3-hexylthiophene) (P3HT). Second, the device stability is further enhanced by increasing the thickness of the mesoporous titania scaffold. Finally, tetraethyl orthosilicate (TEOS) is used as a processing additive in the perovskite precursor solution to form an in situ protective layer. On our optimized device, a remarkable long-term device stability of more than 1200 h is achieved. X-ray diffraction patterns suggest more than 2500 h of material stability.

Original languageEnglish (US)
Article number7807284
Pages (from-to)532-538
Number of pages7
JournalIEEE Journal of Photovoltaics
Volume7
Issue number2
DOIs
StatePublished - Mar 2017
Externally publishedYes

Keywords

  • Methylammonium lead iodide (MAPbI)
  • perovskite solar cells
  • photovoltaic (PV)
  • stability
  • tetraethyl orthosilicate (TEOS)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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