Unveiling of a puzzling dual ionic migration in lead- and iodide-deficient halide perovskites (d-HPs) and its impact on solar cell J-V curve hysteresis.

Autor: Gollino L; Chimie-ParisTech, PSL Université, CNRS Institut de Recherche de Chimie-Paris (IRCP) Paris cedex 05 France., Zheng D; Chimie-ParisTech, PSL Université, CNRS Institut de Recherche de Chimie-Paris (IRCP) Paris cedex 05 France., Mercier N; MOLTECH-Anjou University of Angers Angers France., Pauporté T; Chimie-ParisTech, PSL Université, CNRS Institut de Recherche de Chimie-Paris (IRCP) Paris cedex 05 France.
Jazyk: angličtina
Zdroj: Exploration (Beijing, China) [Exploration (Beijing)] 2023 Oct 20; Vol. 4 (1), pp. 20220156. Date of Electronic Publication: 2023 Oct 20 (Print Publication: 2024).
DOI: 10.1002/EXP.20220156
Abstrakt: Halide perovskite solar cells are characterized by a hysteresis between current-voltage ( J - V) curves recorded on the reverse and on the forward scan directions, and the suppression of this phenomenon has focused great attention. In the present work, it is shown that a special family of 3D perovskites, that are rendered lead -and iodide- deficient (d-HPs) by incorporating large organic cations, are characterized by a large hysteresis. The strategy of passivating defects by K + , which has been successful in reducing the hysteresis of 3D perovskite perovskite solar cells, is inefficient with the d-HPs. By glow discharge optical emission spectroscopy (GD-OES), the existence of the classic iodide migration in these layers is unveiled, which is efficiently blocked by potassium cation insertion. However, it is also shown that it co-exists with the migration of the large organic cations characteristics of d-HPs which are not blocked by the alkali metal ion. The migration of those large cations is intrinsically linked to the special structure of the d-HP. It is suggested that it takes place through channels, present throughout the whole perovskite layer after the substitution of PbI + units by the large cations, making this phenomenon intrinsic to the original structure of d-HPs.
Competing Interests: The authors declare no conflicts of interest.
(© 2023 The Authors. Exploration published by Henan University and John Wiley & Sons Australia, Ltd.)
Databáze: MEDLINE
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