An embedded interfacial network stabilizes inorganic CsPbI3 perovskite thin films

Julian A. Steele, Tom Braeckevelt, Vittal Prakasam, Giedrius Degutis, Haifeng Yuan, Handong Jin, Eduardo Solano, Pascal Puech, Shreya Basak, Maria Isabel Pintor-Monroy, Hans Van Gorp, Guillaume Fleury, Ruo Xi Yang, Zhenni Lin, Haowei Huang, Elke Debroye, Dmitry Chernyshov, Bin Chen, Mingyang Wei, Yi HouRobert Gehlhaar, Jan Genoe, Steven De Feyter, Sven M.J. Rogge, Aron Walsh, Edward H. Sargent, Peidong Yang, Johan Hofkens, Veronique Van Speybroeck, Maarten B.J. Roeffaers

Research output: Contribution to journalArticlepeer-review


The black perovskite phase of CsPbI3 is promising for optoelectronic applications; however, it is unstable under ambient conditions, transforming within minutes into an optically inactive yellow phase, a fact that has so far prevented its widespread adoption. Here we use coarse photolithography to embed a PbI2-based interfacial microstructure into otherwise-unstable CsPbI3 perovskite thin films and devices. Films fitted with a tessellating microgrid are rendered resistant to moisture-triggered decay and exhibit enhanced long-term stability of the black phase (beyond 2.5 years in a dry environment), due to increasing the phase transition energy barrier and limiting the spread of potential yellow phase formation to structurally isolated domains of the grid. This stabilizing effect is readily achieved at the device level, where unencapsulated CsPbI3 perovskite photodetectors display ambient-stable operation. These findings provide insights into the nature of phase destabilization in emerging CsPbI3 perovskite devices and demonstrate an effective stabilization procedure which is entirely orthogonal to existing approaches.

Original languageEnglish
Article number7513
JournalNature communications
Issue number1
Publication statusPublished - 2022 Dec

Bibliographical note

Funding Information:
J.A.S., T.B., and S.M.J.R. acknowledge financial support from the Research Foundation - Flanders [FWO: grant No.’s 12Y7218N, V439819N, V400622N and 12Y7221N (J.A.S.), 1SC1319 (T.B), and 12T3519N (S.M.J.R.)]. J.H. and M.B.J.R. acknowledge financial support from the Research Foundation - Flanders (FWO) through research projects (FWO Grant No’s G098319N, S002019N "PROCEED", S004322N "GIGAPIXEL") and ZW15_09-GOH6316), from the KU Leuven Research fund (iBOF-21-085 "PERSIST") and from the Flemish government through long term structural Methusalem funding (CASAS2, Meth/15/04). V.V.S. acknowledges funding from the European Union’s Horizon 2020 research and innovation program (consolidator ERC grant agreement no. 647755 – DYNPOR, 2015–2020) as well as from the Research Board of Ghent University (BOF). S.D.F. acknowledges continuous support from the FWO and KU Leuven. J.A.S. and M.B.J.R. acknowledge financial support from the KU Leuven Research Fund (C14/19/079) and KU Leuven Industrial Research Fund (C3/19/046). The computational resources and services used were provided by Ghent University (Stevin Supercomputer Infrastructure) and the VSC (Flemish Supercomputer Center), funded by FWO. E.H.S. acknowledges financial support from the U.S. Department of the Navy, Office of Naval Research (N00014-20-1-2572). M.I.P.M., R.G., and J.G. acknowledge funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 835133 “ULTRA-LUX”). P.Y. and Z.L. acknowledge the support from U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05-CH11231 within Physical Chemistry of Inorganic Nanostructures Program (KC3103).

Publisher Copyright:
© 2022, The Author(s).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • General
  • Physics and Astronomy(all)


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