Photocurrent-Detected 2D Electronic Spectroscopy Reveals Ultrafast Hole Transfer in Operating PM6/Y6 Organic Solar Cells
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| Titel: | Photocurrent-Detected 2D Electronic Spectroscopy Reveals Ultrafast Hole Transfer in Operating PM6/Y6 Organic Solar Cells |
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| Autoren: | Elisabetta Collini, Luca Bolzonello, Francisco Bernal‐Texca, Jana Ockova, Jordi Martorell, Luis G. Gerling, Niek F. van Hulst |
| Weitere Verfasser: | Universitat Politècnica de Catalunya. Doctorat en Fotònica, Universitat Politècnica de Catalunya. Departament de Física |
| Quelle: | J Phys Chem Lett UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) The Journal of Physical Chemistry Letters |
| Verlagsinformationen: | American Chemical Society (ACS), 2021. |
| Publikationsjahr: | 2021 |
| Schlagwörter: | Física [Àrees temàtiques de la UPC], Dispositius optoelectrònics, Photovoltaic cells, Àrees temàtiques de la UPC::Física, 02 engineering and technology, Optoelectronic devices, Emission spectroscopy, 7. Clean energy, 01 natural sciences, 0104 chemical sciences, Electron transfer, Nonfullerene-acceptor-(NFA), 0210 nano-technology |
| Beschreibung: | The performance of nonfullerene-acceptor-(NFA)-based organic solar cells is rapidly approaching the efficiency of inorganic cells. The chemical versatility of NFAs extends the light-harvesting range to the infrared, while preserving a considerably high open-circuit-voltage, crucial to achieve power-conversion efficiencies >17%. Such low voltage losses in the charge separation process have been attributed to a low-driving-force and efficient exciton dissociation. Here, we address the nature of the subpicosecond dynamics of electron/hole transfer in PM6/Y6 solar cells. While previous reports focused on active layers only, we developed a photocurrent-detected two-dimensional spectroscopy to follow the charge transfer in fully operating devices. Our measurements reveal an efficient hole-transfer from the Y6-acceptor to the PM6-donor on the subpicosecond time scale. On the contrary, at the same time scale, no electron-transfer is seen from the donor to the acceptor. These findings, putting ultrafast spectroscopy in action on operating optoelectronic devices, provide insight for further enhancing NFA solar cell performance. |
| Publikationsart: | Article Other literature type |
| Dateibeschreibung: | application/pdf |
| Sprache: | English |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.1c00822 |
| DOI: | 10.13039/100010661 |
| Zugangs-URL: | https://pubs.acs.org/doi/pdf/10.1021/acs.jpclett.1c00822 https://pubmed.ncbi.nlm.nih.gov/33877838 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8154857 https://pubmed.ncbi.nlm.nih.gov/33877838/ https://pubs.acs.org/doi/pdf/10.1021/acs.jpclett.1c00822 https://europepmc.org/article/PMC/PMC8154857 https://pubmed.ncbi.nlm.nih.gov/33877838/ https://hdl.handle.net/2117/366043 https://doi.org/10.1021/acs.jpclett.1c00822 |
| Rights: | CC BY NC ND |
| Dokumentencode: | edsair.doi.dedup.....6d26d1909c03a76cb8b557ba7f845b87 |
| Datenbank: | OpenAIRE |
Nájsť tento článok vo Web of Science | Abstract: | The performance of nonfullerene-acceptor-(NFA)-based organic solar cells is rapidly approaching the efficiency of inorganic cells. The chemical versatility of NFAs extends the light-harvesting range to the infrared, while preserving a considerably high open-circuit-voltage, crucial to achieve power-conversion efficiencies >17%. Such low voltage losses in the charge separation process have been attributed to a low-driving-force and efficient exciton dissociation. Here, we address the nature of the subpicosecond dynamics of electron/hole transfer in PM6/Y6 solar cells. While previous reports focused on active layers only, we developed a photocurrent-detected two-dimensional spectroscopy to follow the charge transfer in fully operating devices. Our measurements reveal an efficient hole-transfer from the Y6-acceptor to the PM6-donor on the subpicosecond time scale. On the contrary, at the same time scale, no electron-transfer is seen from the donor to the acceptor. These findings, putting ultrafast spectroscopy in action on operating optoelectronic devices, provide insight for further enhancing NFA solar cell performance. |
|---|---|
| ISSN: | 19487185 |
| DOI: | 10.1021/acs.jpclett.1c00822 |