Efficient singlet exciton fission in pentacene prepared from a soluble precursor
Carrier multiplication using singlet exciton fission (SF) to generate a pair of spin-triplet excitons from a single optical excitation has been highlighted as a promising approach to boost the photocurrent in photovoltaics (PVs) thereby allowing PV operation beyond the Shockley-Queisser limit. The a...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2016-11-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/1.4968518 |
| _version_ | 1818525972612251648 |
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| author | Maxim Tabachnyk Arfa H. Karani Katharina Broch Luis M. Pazos-Outón James Xiao Tom C. Jellicoe Jiří Novák David Harkin Andrew J. Pearson Akshay Rao Neil C. Greenham Marcus L. Böhm Richard H. Friend |
| author_facet | Maxim Tabachnyk Arfa H. Karani Katharina Broch Luis M. Pazos-Outón James Xiao Tom C. Jellicoe Jiří Novák David Harkin Andrew J. Pearson Akshay Rao Neil C. Greenham Marcus L. Böhm Richard H. Friend |
| author_sort | Maxim Tabachnyk |
| collection | DOAJ |
| description | Carrier multiplication using singlet exciton fission (SF) to generate a pair of spin-triplet excitons from a single optical excitation has been highlighted as a promising approach to boost the photocurrent in photovoltaics (PVs) thereby allowing PV operation beyond the Shockley-Queisser limit. The applicability of many efficient fission materials, however, is limited due to their poor solubility. For instance, while acene-based organics such as pentacene (Pc) show high SF yields (up to200%), the plain acene backbone renders the organic molecule insoluble in common organic solvents. Previous approaches adding solubilizing side groups such as bis(tri-iso-propylsilylethynyl) to the Pc core resulted in low vertical carrier mobilities due to reduction of the transfer integrals via steric hindrance, which prevented high efficiencies in PVs. Here we show how to achieve good solubility while retaining the advantages of molecular Pc by using a soluble precursor route. The precursor fully converts into molecular Pc through thermal removal of the solubilizing side groups upon annealing above 150 °C in the solid state. The annealed precursor shows small differences in the crystallinity compared to evaporated thin films of Pc, indicating that the Pc adopts the bulk rather than surface polytype. Furthermore, we identify identical SF properties such as sub-100 fs fission time and equally long triplet lifetimes in both samples. |
| first_indexed | 2024-12-11T06:16:29Z |
| format | Article |
| id | doaj.art-65f3b4a93db048118c491474d8e7ee4e |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-12-11T06:16:29Z |
| publishDate | 2016-11-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-65f3b4a93db048118c491474d8e7ee4e2022-12-22T01:17:57ZengAIP Publishing LLCAPL Materials2166-532X2016-11-01411116112116112-610.1063/1.4968518010611APMEfficient singlet exciton fission in pentacene prepared from a soluble precursorMaxim Tabachnyk0Arfa H. Karani1Katharina Broch2Luis M. Pazos-Outón3James Xiao4Tom C. Jellicoe5Jiří Novák6David Harkin7Andrew J. Pearson8Akshay Rao9Neil C. Greenham10Marcus L. Böhm11Richard H. Friend12Cavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCentral European Institute of Technology and Department of Condensed Matter Physics, Masaryk University, Kotlarska 2, Brno 61137, Czech RepublicCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCavendish Laboratory, J.J. Thomson Avenue, University of Cambridge, Cambridge CB3 OHE, UKCarrier multiplication using singlet exciton fission (SF) to generate a pair of spin-triplet excitons from a single optical excitation has been highlighted as a promising approach to boost the photocurrent in photovoltaics (PVs) thereby allowing PV operation beyond the Shockley-Queisser limit. The applicability of many efficient fission materials, however, is limited due to their poor solubility. For instance, while acene-based organics such as pentacene (Pc) show high SF yields (up to200%), the plain acene backbone renders the organic molecule insoluble in common organic solvents. Previous approaches adding solubilizing side groups such as bis(tri-iso-propylsilylethynyl) to the Pc core resulted in low vertical carrier mobilities due to reduction of the transfer integrals via steric hindrance, which prevented high efficiencies in PVs. Here we show how to achieve good solubility while retaining the advantages of molecular Pc by using a soluble precursor route. The precursor fully converts into molecular Pc through thermal removal of the solubilizing side groups upon annealing above 150 °C in the solid state. The annealed precursor shows small differences in the crystallinity compared to evaporated thin films of Pc, indicating that the Pc adopts the bulk rather than surface polytype. Furthermore, we identify identical SF properties such as sub-100 fs fission time and equally long triplet lifetimes in both samples.http://dx.doi.org/10.1063/1.4968518 |
| spellingShingle | Maxim Tabachnyk Arfa H. Karani Katharina Broch Luis M. Pazos-Outón James Xiao Tom C. Jellicoe Jiří Novák David Harkin Andrew J. Pearson Akshay Rao Neil C. Greenham Marcus L. Böhm Richard H. Friend Efficient singlet exciton fission in pentacene prepared from a soluble precursor APL Materials |
| title | Efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| title_full | Efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| title_fullStr | Efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| title_full_unstemmed | Efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| title_short | Efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| title_sort | efficient singlet exciton fission in pentacene prepared from a soluble precursor |
| url | http://dx.doi.org/10.1063/1.4968518 |
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