Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Halide perovskites are technologically interesting across a wide range of optoelectronic devices, especially photovoltaics, but material stability has proven to be challenging. One degradation mode of note is the meta stability of the perovskite phase of some material compositions. This was studied by tracking the change of CsPbI 3 from its optoelectronically relevant perovskite phase to its thermodynamically stable nonperovskite phase, δ-CsPbI 3 . We explore kinetics as a function of surface chemistry and observe a quantitatively similar, ∼5-fold, reduction in the phase transition rate between neat films and those treated with CsI and CdI 2 . Using XPS to explore surface chemistry changes across samples, we link the reduction in the phase transition rate to the surface iodide concentration. When informed by previous theoretical studies, these experiments point to surface iodide vacancies as the nucleation sites for δ-CsPbI 3 growth and show that phase nucleation is the rate limiting step in δ-CsPbI 3 formation for CsPbI 3 perovskite thin films.
Source: ACS Energy Letters
Institutions: Hope College, University of Washington, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, Institut Lavoisier de Versailles, Institut Photovoltaïque d’Île-de-France, École Polytechnique, Chimie ParisTech - PSL, Université Paris Sciences et Lettres
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G1268937282, G292648327, RUI: Exploring Nonperovskite Phase Growth Mechanisms in Halide Perovskites, PROGRAM ELEMENTS THAT MAKE UP THE MSGC PORTFOLIO INCLUDE THE FOLLOWING: FEUOWSHIPS THAT SUPPORT GRADUATE AND UNDERGRADUATE STUDENTS FOR RESEARCH OR P, G5074502563, G5080669154, G7514501276, MRI: Acquisition of a Field-Emission Scanning Electron Microscope for Multidisciplinary Research Needs with Undergraduates at Hope College, G8066769327
OpenAlex ID: W4401604723