Understanding the mechanism of metal-induced degradation in perovskite nanocrystals. Issue 41 (2nd October 2019)

• Record Type: Journal Article
• Authors: Saris, Seryio; Niemann, Valerie; Mantella, Valeria; Loiudice, Anna; Buonsanti, Raffaella
• Is Part Of: Nanoscale. Volume 11:Issue 41(2019)
• Page Start: 19543
• Page End: 19550
• Publication Date: 2019-10-02
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c9nr06328e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Iodide migration and leaching out of the perovskite towards the metal, forming metal iodides, is identified as the main driving force behind the interaction between these two nanocrystals, eventually leading to the degradation of the perovskite. Abstract : A deeper understanding of the perovskite–metal chemistry is crucial to elucidate the instability problems at the device level that can be caused by such interactions. Here, we study the reactions occurring between CsPbX3 (X = Br, BrI, I) perovskite and metal (M = Ag, Cu, Au) nanocrystals. We demonstrate a fast (<1 hour) optical and structural degradation of the I-containing nanocrystals driven by the formation of metal iodides with reaction kinetics according to the following order Cu < Ag < Au. These results point to the need for thoughtful considerations while constructing optoelectronic devices out of all-inorganic CsPbX3 nanocrystals, where the use of contact metals is a necessity.