Cai, F., Cai, J., Yang, L. et al. (6 more authors) (2018) Molecular Engineering of Conjugated Polymers for Efficient Hole Transport and Defect Passivation in Perovskite Solar Cells. Nano Energy, 45. pp. 28-36. ISSN 2211-2855
Abstract
Organic-inorganic hybrid perovskite solar cells represent an exceptional candidate for nextgeneration photovoltaic technology. However, the presence of surface defects in perovskite crystals limits the performance as well as the stability of perovskite solar cells. We have employed a series of carbazole and benzothiadiazole (BT) based donor-acceptor copolymers, which have different lengths of alkoxy side-chains grafted on the BT unit, as the dopant-free hole transport materials (HTMs) for perovskite solar cells. We demonstrate that although these side-chains can reduce the π−π stacking structural order of these copolymers to affect the hole transport properties, the methoxy unit introduces a desired defect passivation effect. Compared to the Spiro-OMeTAD-based device, the copolymer with methoxy side-chains on the BT unit (namely PCDTBT1) as the HTM achieved superior power conversion efficiency and stability due to efficient hole transport and the suppression of trap-induced degradation, whilst the copolymer with octyloxy side-chains on the BT unit (namely PCDTBT8) as the HTM lead to poor performance and stability.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 Elsevier. This is an author produced version of a paper subsequently published in Nano Energy. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Perovskite solar cells; hole transport; defect passivation; conjugated polymer |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/I028641/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Jan 2018 15:16 |
Last Modified: | 13 Jul 2020 13:47 |
Published Version: | https://doi.org/10.1016/j.nanoen.2017.12.028 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.nanoen.2017.12.028 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125594 |
Downloads
Licence: CC-BY-NC-ND 4.0
Filename: Supporting information.pdf
Licence: CC-BY-NC-ND 4.0