Bias-driven conductance increase with length in porphyrin tapes
A key goal in molecular electronics has been to find molecules that facilitate efficient charge transport over long distances. Normally, molecular wires become less conductive with increasing length. Here, we report a series of fused porphyrin oligomers for which the conductance increases substantia...
| Главные авторы: | , , , , , , , , , , , , , , , , |
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| Формат: | Journal article |
| Язык: | English |
| Опубликовано: |
American Chemical Society
2018
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| _version_ | 1826291911487389696 |
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| author | Leary, E Limburg, B Alanazy, A Sangtarash, S Grace, I Swada, K Esdaile, L Noori, M González, M Rubio-Bollinger, G Sadeghi, H Hodgson, A Agraı T, N Higgins, S Lambert, C Anderson, H Nichols, R |
| author_facet | Leary, E Limburg, B Alanazy, A Sangtarash, S Grace, I Swada, K Esdaile, L Noori, M González, M Rubio-Bollinger, G Sadeghi, H Hodgson, A Agraı T, N Higgins, S Lambert, C Anderson, H Nichols, R |
| author_sort | Leary, E |
| collection | OXFORD |
| description | A key goal in molecular electronics has been to find molecules that facilitate efficient charge transport over long distances. Normally, molecular wires become less conductive with increasing length. Here, we report a series of fused porphyrin oligomers for which the conductance increases substantially with length by >10-fold at a bias of 0.7 V. This exceptional behavior can be attributed to the rapid decrease of the HOMO-LUMO gap with the length of fused porphyrins. In contrast, for butadiyne-linked porphyrin oligomers with moderate inter-ring coupling, a normal conductance decrease with length is found for all bias voltages explored (±1 V), although the attenuation factor (β) decreases from ca. 2 nm-1 at low bias to <1 nm-1 at 0.9 V, highlighting that β is not an intrinsic molecular property. Further theoretical analysis using density functional theory underlines the role of intersite coupling and indicates that this large increase in conductance with length at increasing voltages can be generalized to other molecular oligomers. |
| first_indexed | 2024-03-07T03:06:36Z |
| format | Journal article |
| id | oxford-uuid:b2c17b15-8ef8-40cb-88af-65b42dc893e7 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:06:36Z |
| publishDate | 2018 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:b2c17b15-8ef8-40cb-88af-65b42dc893e72022-03-27T04:14:04ZBias-driven conductance increase with length in porphyrin tapesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b2c17b15-8ef8-40cb-88af-65b42dc893e7EnglishSymplectic Elements at OxfordAmerican Chemical Society2018Leary, ELimburg, BAlanazy, ASangtarash, SGrace, ISwada, KEsdaile, LNoori, MGonzález, MRubio-Bollinger, GSadeghi, HHodgson, AAgraı T, NHiggins, SLambert, CAnderson, HNichols, RA key goal in molecular electronics has been to find molecules that facilitate efficient charge transport over long distances. Normally, molecular wires become less conductive with increasing length. Here, we report a series of fused porphyrin oligomers for which the conductance increases substantially with length by >10-fold at a bias of 0.7 V. This exceptional behavior can be attributed to the rapid decrease of the HOMO-LUMO gap with the length of fused porphyrins. In contrast, for butadiyne-linked porphyrin oligomers with moderate inter-ring coupling, a normal conductance decrease with length is found for all bias voltages explored (±1 V), although the attenuation factor (β) decreases from ca. 2 nm-1 at low bias to <1 nm-1 at 0.9 V, highlighting that β is not an intrinsic molecular property. Further theoretical analysis using density functional theory underlines the role of intersite coupling and indicates that this large increase in conductance with length at increasing voltages can be generalized to other molecular oligomers. |
| spellingShingle | Leary, E Limburg, B Alanazy, A Sangtarash, S Grace, I Swada, K Esdaile, L Noori, M González, M Rubio-Bollinger, G Sadeghi, H Hodgson, A Agraı T, N Higgins, S Lambert, C Anderson, H Nichols, R Bias-driven conductance increase with length in porphyrin tapes |
| title | Bias-driven conductance increase with length in porphyrin tapes |
| title_full | Bias-driven conductance increase with length in porphyrin tapes |
| title_fullStr | Bias-driven conductance increase with length in porphyrin tapes |
| title_full_unstemmed | Bias-driven conductance increase with length in porphyrin tapes |
| title_short | Bias-driven conductance increase with length in porphyrin tapes |
| title_sort | bias driven conductance increase with length in porphyrin tapes |
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