Sasitharan, K., Frisch, J., Kuliček, J. et al. (5 more authors) (2024) Tuning the morphology and energy levels in organic solar cells with metal–organic framework nanosheets. Scientific Reports, 14. 29559.
Abstract
Metal–organic framework nanosheets (MONs) have proved themselves to be useful additives for enhancing the performance of a variety of thin film solar cell devices. However, to date only isolated examples have been reported. In this work we take advantage of the modular structure of MONs in order to resolve the effect of their different structural and optoelectronic features on the performance of organic photovoltaic (OPV) devices. Three different MONs were synthesized using different combinations of two porphyrin-based ligands meso-tetracarboxyphenyl porphyrin (TCPP) or tetrapyridyl-porphyrin (TPyP) with either zinc and/or copper ions and the effect of their addition to polythiophene-fullerene (P3HT-PC<jats:sub>71</jats:sub>BM) OPV devices was investigated. The power conversion efficiency (PCE) of devices was found to approximately double with the addition of MONs of Zn<jats:sub>2</jats:sub>(ZnTCPP) -4.7% PCE, 10.45 mA/cm<jats:sup>2</jats:sup> short-circuit current density (<jats:italic>J</jats:italic><jats:sub>SC</jats:sub>), 0.69 open-circuit voltage (<jats:italic>V</jats:italic><jats:sub>OC</jats:sub>), 64.20% fill-factor (FF), but was unchanged with the addition of Cu<jats:sub>2</jats:sub>(ZnTPyP) (2.6% PCE, 3.68 mA/cm<jats:sup>2</jats:sup><jats:italic>J</jats:italic><jats:sub>SC</jats:sub>, 0.59 <jats:italic>V</jats:italic><jats:sub>OC</jats:sub>, 46.27% FF) and halved upon the addition of Cu<jats:sub>2</jats:sub>(CuTCPP) (1.24% PCE, 6.72 mA/cm<jats:sup>2</jats:sup><jats:italic>J</jats:italic><jats:sub>SC</jats:sub>, 0.59 <jats:italic>V</jats:italic><jats:sub>OC</jats:sub>, 56.24% FF) compared to devices without nanosheets (2.6% PCE, 6.61 mA/cm<jats:sup>2</jats:sup><jats:italic>J</jats:italic><jats:sub>SC</jats:sub>, 0.58 <jats:italic>V</jats:italic><jats:sub>OC</jats:sub>, 56.64% FF). Our analysis indicates that there are three different mechanisms by which MONs can influence the photoactive layer – light absorption, energy level alignment, and morphological changes. Analysis of external quantum efficiency, UV–vis and photoelectron spectroscopy data found that MONs have similar effects on light absorption and energy level alignment. However, atomic force and Raman microscopy studies revealed that the nanosheet thickness and lateral size are crucial parameters in enabling the MONs to act as beneficial additives resulting in an improvement of the OPV device performance. We anticipate this study will aid in the design of MONs and other 2D materials for future use in other light harvesting and emitting devices.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Authors. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
Keywords: | Materials for energy and catalysis; Metal–organic frameworks |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Chemistry (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Dec 2024 09:51 |
Last Modified: | 12 Dec 2024 09:51 |
Published Version: | http://dx.doi.org/10.1038/s41598-024-80007-y |
Status: | Published |
Publisher: | Springer Science and Business Media LLC |
Refereed: | Yes |
Identification Number: | 10.1038/s41598-024-80007-y |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:220334 |