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- Publisher
- Springer Journals
- Copyright
- Copyright © 2016 by Nature Publishing Group
- Subject
- Energy; Energy, general; Energy Policy, Economics and Management; Energy Systems; Energy Storage; Renewable and Green Energy
- eISSN
- 2058-7546
- DOI
- 10.1038/nenergy.2016.81
- Publisher site
- See Article on Publisher Site
Abstract
Perovskite solar cells have attracted significant research efforts due to their remarkable performance, with certified power conversion efficiency now reaching 22%. Solution-processed perovskite thin films are polycrystalline, and grain boundaries are thought to be responsible for causing recombination and trapping of charge carriers. Here we report an effective and reproducible way of treating grain boundaries in CH3NH3PbI3 films deposited by means of a Lewis acid–base adduct approach. We show by high-resolution transmission electron microscopy lattice images that adding 6 mol% excess CH3NH3I to the precursor solution resulted in a CH3NH3I layer forming at the grain boundaries. This layer is responsible for suppressing non-radiative recombination and improving hole and electron extraction at the grain boundaries by forming highly ionic-conducting pathways. We report an average power conversion efficiency of 20.1% over 50 cells (best cell at 20.4%) together with significantly reduced current–voltage hysteresis achieved by this grain boundary healing process.
Journal
Nature Energy – Springer Journals
Published: Jun 20, 2016