Structure and chemical stability in perovskite-polymer hybrid photovoltaic materials

Daniel J. Fairfield, Hiroaki Sai, Ashwin Narayanan, James V. Passarelli, Michelle Chen, Joseph Palasz, Liam C. Palmer, Michael R Wasielewski, Samuel I Stupp

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Adding polymers to methylammonium lead iodide perovskite solar cell active layers has been previously shown to increase their chemical stability, but stabilization mechanisms in these hybrid materials are poorly understood. We report here on a structural and spectroscopic analysis in a number of perovskite-polymer hybrid materials and compare their stability. We observed that perovskite crystallite sizes decrease with the addition of polymers (polyethylene glycol, polyethyleneimine, poly(acrylic acid) and polyvinylpyrrolidone), and through the use of nanomechanical AFM showed phase contrast in the perovskite-polymer mixture. NMR and single-crystal growth experiments reveal that acid-base interactions, as well as facet-dependent interfacial interactions between perovskite and polymer, contribute to differences in stabilities of these hybrid materials. The polymers investigated tend to suppress the formation of a hydrate crystal phase that accelerates the degradation reaction, and we report that adding poly(acrylic acid) increases significantly the stability of perovskite films under humid air and ambient illumination. Under these controlled degradation conditions, perovskite-poly(acrylic acid) hybrid solar cells maintain stable efficiency for the first 3 days and then slowly degrade over the next 6 days under humid air and illumination, whereas control perovskite solar cells degrade entirely within the first 2 days. These results highlight the importance of choosing suitable functional groups in the polymer phase of perovskite hybrid solar cells to prolong their device lifetime.

Original languageEnglish
Pages (from-to)1687-1699
Number of pages13
JournalJournal of Materials Chemistry A
Volume7
Issue number4
DOIs
Publication statusPublished - Jan 1 2019

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Chemical stability
carbopol 940
Perovskite
Polymers
Hybrid materials
Acrylics
Acids
Solar cells
Lighting
Polyethyleneimine
Povidone
Degradation
Spectroscopic analysis
Iodides
Crystallite size
Crystallization
Air
perovskite
Hydrates
Crystal growth

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Structure and chemical stability in perovskite-polymer hybrid photovoltaic materials. / Fairfield, Daniel J.; Sai, Hiroaki; Narayanan, Ashwin; Passarelli, James V.; Chen, Michelle; Palasz, Joseph; Palmer, Liam C.; Wasielewski, Michael R; Stupp, Samuel I.

In: Journal of Materials Chemistry A, Vol. 7, No. 4, 01.01.2019, p. 1687-1699.

Research output: Contribution to journalArticle

Fairfield, DJ, Sai, H, Narayanan, A, Passarelli, JV, Chen, M, Palasz, J, Palmer, LC, Wasielewski, MR & Stupp, SI 2019, 'Structure and chemical stability in perovskite-polymer hybrid photovoltaic materials', Journal of Materials Chemistry A, vol. 7, no. 4, pp. 1687-1699. https://doi.org/10.1039/c8ta07545j
Fairfield DJ, Sai H, Narayanan A, Passarelli JV, Chen M, Palasz J et al. Structure and chemical stability in perovskite-polymer hybrid photovoltaic materials. Journal of Materials Chemistry A. 2019 Jan 1;7(4):1687-1699. https://doi.org/10.1039/c8ta07545j
Fairfield, Daniel J. ; Sai, Hiroaki ; Narayanan, Ashwin ; Passarelli, James V. ; Chen, Michelle ; Palasz, Joseph ; Palmer, Liam C. ; Wasielewski, Michael R ; Stupp, Samuel I. / Structure and chemical stability in perovskite-polymer hybrid photovoltaic materials. In: Journal of Materials Chemistry A. 2019 ; Vol. 7, No. 4. pp. 1687-1699.
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