Self-Crystallized Multifunctional 2D Perovskite for Efficient and Stable Perovskite Solar Cells

Hobeom Kim, Mingyuan Pei, Yonghui Lee, Albertus A. Sutanto, Sanghyun Paek, Valentin I.E. Queloz, Aron J. Huckaba, Kyung Taek Cho, Hyung Joong Yun, Hoichang Yang, Mohammad Khaja Nazeeruddin

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


Recently, perovskite solar cells (PSC) with high power-conversion efficiency (PCE) and long-term stability have been achieved by employing 2D perovskite layers on 3D perovskite light absorbers. However, in-depth studies on the material and the interface between the two perovskite layers are still required to understand the role of the 2D perovskite in PSCs. Self-crystallization of 2D perovskite is successfully induced by deposition of benzyl ammonium iodide (BnAI) on top of a 3D perovskite light absorber. The self-crystallized 2D perovskite can perform a multifunctional role in facilitating hole transfer, owing to its random crystalline orientation and passivating traps in the 3D perovskite. The use of the multifunctional 2D perovskite (M2P) leads to improvement in PCE and long-term stability of PSCs both with and without organic hole transporting material (HTM), 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD) compared to the devices without the M2P.

Original languageEnglish
Article number1910620
JournalAdvanced Functional Materials
Issue number19
StatePublished - May 1 2020

Bibliographical note

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • 2D perovskites
  • hole-transfer facilitators
  • hole-transporting layers
  • perovskite solar cells
  • trap passivation

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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