Bilateral Interface Engineering for Efficient and Stable Perovskite Solar Cells Using Phenylethylammonium Iodide

Yuanyuan Zhang, Yuanyuan Zhang, Soyeong Jang, In Wook Hwang, Yun Kyung Jung, Bo Ram Lee, Joo Hyun Kim, Kwang Ho Kim*, Sung Heum Park*, Sung Heum Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Achieving high efficiency and long-term device stability is a vital issue for the commercialization of organic-inorganic hybrid perovskite solar cells (PeSCs). In this work, phenylethylammonium iodide (PEAI)-induced bilateral interface engineering was developed to improve the device efficiency and stability of methylammonium lead triiodide (MAPbI3)-based PeSCs. Introducing PEAI onto a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) layer modifies the surface properties of PEDOT:PSS and facilitates the formation of a high-quality perovskite active layer with enlarged grains on PEDOT:PSS. PEA+ in PEAI-PEDOT:PSS also alters the work function of PEDOT:PSS, leading to a reduction in the energy difference between the PEDOT:PSS and MAPbI3 perovskite layers, which decreases the energy loss during charge transfer. Additionally, depositing PEAI onto three-dimensional (3D) perovskite yields a two-dimensional/three-dimensional (2D/3D) stacked structure for the perovskite active layer. Because the two-dimensional (2D) top layer acts as a capping layer to prevent water penetration, the stability of the perovskite active layer is significantly enhanced. A PeSC device fabricated based on this combination exhibits enhanced power conversion efficiency (PCE) and an extended device lifetime compared to a pristine PeSC. Under high-humidity conditions (75 ± 5%), the PEAI-treated PeSC retains 88% of its initial power conversion efficiency (PCE) after 100 h. In contrast, a pristine PeSC device loses over 99% of its initial PCE after only 25 h under the same conditions.

Original languageEnglish (US)
Pages (from-to)24827-24836
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number22
StatePublished - Jun 3 2020


  • bilateral interface engineering
  • high efficiency
  • long-term stability
  • PEAI
  • perovskite solar cells

ASJC Scopus subject areas

  • General Materials Science


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