Enhanced long-term stability of perovskite solar cells by passivating grain boundary with polydimethylsiloxane (PDMS)

Woochul Kim, Jong Bae Park, Hyeonghun Kim, Kihyeun Kim, Jiyoon Park, Sungjun Cho, Heon Lee, Yusin Pak, Gun Young Jung

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted considerable attention due to their superior power conversion efficiency (PCE), which has recently exceeded 22%. However, some issues remain regarding their use in real-life environments, with the most pressing matter being their long-term stability under humid conditions. Hybrid perovskites are naturally vulnerable to water molecules, which can induce the decomposition of perovskite photoactive chemicals such as MAPbI3 and FAPbI3. Therefore, to achieve commercial-level long-term PSC stability, the adsorption and infiltration of water into the perovskite films must be minimized. Herein, it is demonstrated that polydimethylsiloxane (PDMS) introduced simultaneously during perovskite spin-coating is highly beneficial to passivate the perovskite grains and adjacent grain boundaries (GBs). This not only promotes the formation of lead oxide (PbO) bonds that prevent a water-perovskite reaction, but also contributes to reducing the Pb defect density related to trap-assisted recombination. The photovoltaic performance of the prepared PDMS-passivated PSC is notably enhanced compared to a reference PSC (without PDMS), and surprisingly, more than 90% of the initial PCE (∼15%) is sustained after laboratory storage for 5000 h under 70% relative humidity. These results will pave the way for developing commercial perovskite optoelectronic devices.

Original languageEnglish
Pages (from-to)20832-20839
Number of pages8
JournalJournal of Materials Chemistry A
Volume7
Issue number36
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

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

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