Memory Seeds Enable High Structural Phase Purity in 2D Perovskite Films for High-Efficiency Devices

Siraj Sidhik, Wenbin Li, Mohammad H.K. Samani, Hao Zhang, Yafei Wang, Justin Hoffman, Austin K. Fehr, Michael S. Wong, Claudine Katan, Jacky Even, Amanda B. Marciel, Mercouri G. Kanatzidis, Jean Christophe Blancon*, Aditya D. Mohite*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


2D perovskites are a class of halide perovskites offering a pathway for realizing efficient and durable optoelectronic devices. However, the broad chemical phase space and lack of understanding of film formation have led to quasi-2D perovskite films with polydispersity in perovskite layer thicknesses, which have hindered device performance and stability. Here, a simple and scalable approach is reported, termed as the “phase-selective method”, to fabricate 2D perovskite thin films with homogenous layer thickness (phase purity). The phase-selective method involves the dissolution of single-crystalline powders with a homogeneous perovskite layer thickness in desired solvents to fabricate thin films. In situ characterizations reveal the presence of sub-micrometer-sized seeds in solution that preserve the memory of the dissolved single crystals and dictate the nucleation and growth of grains with an identical thickness of the perovskite layers in thin films. Photovoltaic devices with a p–i–n architecture are fabricated with such films, which yield an efficiency of 17.1% enabled by an open-circuit voltage of 1.20 V, while preserving 97.5% of their peak performance after 800 h under illumination without any external thermal management.

Original languageEnglish (US)
Article number2007176
JournalAdvanced Materials
Issue number29
StatePublished - Jul 22 2021


  • 2D perovskites
  • crystallinity
  • intermediate phases
  • orientation
  • photostability

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science


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