Probing the ionic defect landscape in halide perovskite solar cells
Open Access
- 30 November 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 11 (1), 1-10
- https://doi.org/10.1038/s41467-020-19769-8
Abstract
Point defects in metal halide perovskites play a critical role in determining their properties and optoelectronic performance; however, many open questions remain unanswered. In this work, we apply impedance spectroscopy and deep-level transient spectroscopy to characterize the ionic defect landscape in methylammonium lead triiodide (MAPbI3) perovskites in which defects were purposely introduced by fractionally changing the precursor stoichiometry. Our results highlight the profound influence of defects on the electronic landscape, exemplified by their impact on the device built-in potential, and consequently, the open-circuit voltage. Even low ion densities can have an impact on the electronic landscape when both cations and anions are considered as mobile. Moreover, we find that all measured ionic defects fulfil the Meyer–Neldel rule with a characteristic energy connected to the underlying ion hopping process. These findings support a general categorization of defects in halide perovskite compounds.Keywords
Funding Information
- Bundesministerium für Bildung und Forschung (03SF0514C)
- RCUK | Engineering and Physical Sciences Research Council (EP/L000202)
- National Research Foundation of Korea (2018R1C1B6008728)
This publication has 93 references indexed in Scilit:
- Unusual defect physics in CH3NH3PbI3 perovskite solar cell absorberApplied Physics Letters, 2014
- Electron-Hole Diffusion Lengths Exceeding 1 Micrometer in an Organometal Trihalide Perovskite AbsorberScience, 2013
- Dynamics of atomic diffusion in condensed matter: origin of the Meyer–Neldel compensation lawMonatshefte für Chemie / Chemical Monthly, 2012
- Organic SemiconductorsPublished by Springer Science and Business Media LLC ,2010
- IntroductionPublished by Springer Science and Business Media LLC ,2010
- Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic CellsJournal of the American Chemical Society, 2009
- Determination of defect distributions from admittance measurements and application to Cu(In,Ga)Se2 based heterojunctionsJournal of Applied Physics, 1996
- Determination of the copper diffusion coefficient in silicon from transient ion-driftApplied Physics A, 1993
- The meyer-neldel rule in semiconductorsJournal of Solid State Chemistry, 1984
- Deep-level transient spectroscopy: A new method to characterize traps in semiconductorsJournal of Applied Physics, 1974