Barbe, J., Newman, M., Lilliu, S. orcid.org/0000-0002-8449-2211 et al. (6 more authors) (2018) Localized effect of PbI2 excess in perovskite solar cells probed by high- resolution chemical- optoelectronic mapping. Journal of Materials Chemistry A, 6 (45). pp. 23010-23018. ISSN 2050-7488
Abstract
We report the laser irradiation of CH3NH3PbI3 solar cells to generate and control localized PbI2 degradation product. We show that by tuning the laser power and illumination time, we can controllably form a local excess of PbI2. High-resolution advanced multi-mapping techniques are used to highlight the effect of PbI2 on the photophysical and photoelectrical properties in a complete perovskite device. Whereas a thick PbI2 film at the perovskite/hole transport layer interface has a detrimental effect on the photocurrent and photoluminescence, a thin PbI2 film (<20 nm) leads to a significant photocurrent increase, which is ascribed to the passivation of non-radiative defects and reduced charge recombination at the interface. Our findings reveal that laser irradiation is a new approach to understand the effect of PbI2 surface layers and potentially offers a means to passivate trap states and improve PV properties of perovskite devices.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © The Royal Society of Chemistry 2018. This is an author produced version of a paper subsequently published in Journal of Materials Chemistry A. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/M025020/1 ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/N008065/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Feb 2019 14:39 |
Last Modified: | 29 Oct 2019 01:39 |
Published Version: | https://doi.org/10.1039/c8ta09536a |
Status: | Published |
Publisher: | Royal Society of Chemistry |
Refereed: | Yes |
Identification Number: | 10.1039/c8ta09536a |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:142115 |