Enhancing Luminescence Efficiency by Controlled Island Formation of CsPbBr3 Perovskite. Issue 3 (2nd December 2022)

• Record Type: Journal Article
• Authors: Antrack, Tobias; Kroll, Martin; Merten, Lena; Albaladejo‐Siguan, Miguel; Hinderhofer, Alexander; Konovalov, Oleg V.; Jankowski, Maciej; Benduhn, Johannes; Schreiber, Frank; Vaynzof, Yana; Leo, Karl
• Is Part Of: Advanced optical materials. Volume 11:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-12-02
• Subjects: humidity -- islands -- luminescence -- perovskites -- vacuum deposition; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201408
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: CsPbBr3 is an inorganic perovskite material that is promising for light‐emitting applications. Such applications are known to benefit from an island‐type active layer structure, which enhances the device's light emission efficiency. Here, the impact of the environment on the island formation in thermally deposited bilayers of CsPbBr3 /LiBr is investigated. It is demonstrated that the island formation occurs only in humid environments, leading to an enhancement of the photoluminescence quantum yield by a factor of 350. Time‐resolved grazing‐incidence wide‐angle X‐ray scattering experiments document the island growth process and reveal that the LiBr has already changed the perovskite crystal orientation prior to the island formation. Abstract : Vacuum deposited CsPbBr3 self‐assembles into islands when the perovskite layer is enclosed between LiBr layers. This process of mass transport is only occurring under humid atmosphere and results in an increase of photoluminescence quantum yield by a factor of 350. In situ grazing‐incidence wide‐angle X‐ray scattering measurements reveal that the crystal orientation is already tilted prior to the island formation.