Modifying perovskite films with polyvinylpyrrolidone for ambient-air-stable highly bendable solar cells

Hao Xiong, Giovanni Deluca, Yichuan Rui, Boxin Zhang, Yaogang Li, Qinghong Zhang, Hongzhi Wang, Elsa Reichmanis

Research output: Contribution to journalArticleResearchpeer-review

63 Citations (Scopus)


One major drawback that prevents the large-scale practical implementation of perovskites is their susceptibility to performance degradation in humid environments. Here, we achieved uniform, stable perovskite films within a polyvinylpyrrolidone (PVP) polymer frame via mild solution processing in ambient air with over 60% relative humidity. In addition to facilitating film formation, the hydrophobic PVP served to protect the perovskite grains from atmospheric moisture. Use of PVP, coupled with optimization of the deposition parameters, provided for compact, smooth, pinhole-free perovskite films that when incorporated into a photovoltaic device exhibited highly reproducible efficiencies in the range of up to 17%. In the absence of encapsulation, the devices exhibited stable performance characteristics during exposure to humid ambient air for 600 h. Furthermore, on flexible substrates, the 8 wt % PVP-perovskite samples provided for device efficiencies of ca. 15%. The devices retained ca. 73% of their efficiency after bending 1000 times with a bending radius of 0.5 cm.

Original languageEnglish
Pages (from-to)35385-35394
Number of pages10
JournalACS Applied Materials & Interfaces
Issue number41
Publication statusPublished - 17 Oct 2018
Externally publishedYes


  • bending stability
  • flexible solar cells
  • long-term stability
  • perovskite solar cells
  • polymer doping
  • polyvinylpyrrolidone

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