An embedded interfacial network stabilizes inorganic CsPbI3 perovskite thin films
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 06, 2022
- Source ID
- 10.1038/s41467-022-35255-9
Entities
People
- Aron Walsh
- Bin Chen
- Dmitry Chernyshov
- Eduardo Solano
- Edward H. Sargent
- Elke Debroye
- Giedrius Degutis
- Guillaume Fleury
- Haifeng Yuan
- Handong Jin
- Hans Van Gorp
- Haowei Huang
- Jan Genoe
- Johan Hofkens
- Julian A Steele
- Maarten Roeffaers
- Maria Isabel Pintor-monroy
- Mingyang Wei
- Pascal Puech
- Peidong Yang
- Robert Gehlhaar
- Ruo Xi Yang
- Shreya Basak
- Steven De Feyter
- Sven M. J. Rogge
- Tom Braeckevelt
- Veronique Van Speybroeck
- Vittal Prakasam
- Yi Hou
- Zhenni Lin
Organizations
- Horizon 2020
- Katholieke Universiteit Leuven
- Office of Naval Research
- Research Council, KU Leuven
- Research Foundation - Flanders
- United States Department of Energy