Enhanced UV stability of perovskite solar cells with a SrO interlayer

Sang Won Lee, Seongtak Kim, Soohyun Bae, Kyungjin Cho, Taewon Chung, Jae Keun Hwang, Inseol Song, Wonkyu Lee, Sungeun Park, Jaebong Jung, Jihun Chun, Yoon Jung Lee, Yeon Ji Moon, Hae Seok Lee, Donghwan Kim, Chan Bin Mo, Yoonmook Kang

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


We investigated strontium oxide (SrO) as an interlayer material to enhance the UV stability of a CH3NH3PbI3 perovskite solar cell. Moisture and over 400 nm wavelength of light were excluded to investigate the effect of UV light only. Two different interlayer fabrication processes were examined to optimize the performance of this solar cell. Devices fabricated by dipping for 30 min in SrO solution exhibited photoconversion efficiencies of 15.5%, whereas those fabricated with 60-min dipping showed photoconversion efficiencies of 15% and exhibited local Sr agglomeration. Devices with SrO displayed lower initial efficiencies than those without any SrO layer (17.6%), However, a device without SrO retained only 34.4% of its initial efficiency after 100 h of UV exposure. In contrast, SrO-incorporated devices retained almost 60.0% of their initial efficiency. Severe μ-PL mapping intensity degradation was observed in devices that did not include the interlayer, but no degradation was observed in those with the SrO interlayer. This can be attributed to the passivation of the degradation sites by SrO.

Original languageEnglish
Pages (from-to)343-348
Number of pages6
JournalOrganic Electronics
Publication statusPublished - 2018 Dec

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.


  • Interface passivation
  • Micro-photoluminescence
  • Perovskite solar cell
  • Strontium oxide
  • UV stability

ASJC Scopus subject areas

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


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