{"doi":"10.1021/acs.nanolett.6b05091","extern":"1","month":"01","year":"2017","external_id":{"pmid":["28112947"]},"volume":17,"title":"Too hot for photon-assisted transport: Hot-electrons dominate conductance enhancement in illuminated single-molecule junctions","date_published":"2017-01-23T00:00:00Z","publisher":"American Chemical Society","publication":"Nano Letters","language":[{"iso":"eng"}],"publication_status":"published","pmid":1,"status":"public","day":"23","abstract":[{"lang":"eng","text":"We investigate light-induced conductance enhancement in single-molecule junctions via photon-assisted transport and hot-electron transport. Using 4,4′-bipyridine bound to Au electrodes as a prototypical single-molecule junction, we report a 20–40% enhancement in conductance under illumination with 980 nm wavelength radiation. We probe the effects of subtle changes in the transmission function on light-enhanced current and show that discrete variations in the binding geometry result in a 10% change in enhancement. Importantly, we prove theoretically that the steady-state behavior of photon-assisted transport and hot-electron transport is identical but that hot-electron transport is the dominant mechanism for optically induced conductance enhancement in single-molecule junctions when the wavelength used is absorbed by the electrodes and the hot-electron relaxation time is long. We confirm this experimentally by performing polarization-dependent conductance measurements of illuminated 4,4′-bipyridine junctions. Finally, we perform lock-in type measurements of optical current and conclude that currents due to laser-induced thermal expansion mask optical currents. This work provides a robust experimental framework for studying mechanisms of light-enhanced transport in single-molecule junctions and offers tools for tuning the performance of organic optoelectronic devices by analyzing detailed transport properties of the molecules involved."}],"quality_controlled":"1","intvolume":"        17","article_type":"letter_note","date_created":"2024-09-09T09:01:35Z","type":"journal_article","scopus_import":"1","date_updated":"2024-12-18T07:49:53Z","publication_identifier":{"eissn":["1530-6992"],"issn":["1530-6984"]},"page":"1255-1261","author":[{"first_name":"E-Dean","full_name":"Fung, E-Dean","last_name":"Fung"},{"full_name":"Adak, Olgun","first_name":"Olgun","last_name":"Adak"},{"first_name":"Giacomo","full_name":"Lovat, Giacomo","last_name":"Lovat"},{"last_name":"Scarabelli","first_name":"Diego","full_name":"Scarabelli, Diego"},{"id":"9ebb78a5-cc0d-11ee-8322-fae086a32caf","last_name":"Venkataraman","full_name":"Venkataraman, Latha","orcid":"0000-0002-6957-6089","first_name":"Latha"}],"oa_version":"None","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"17947","citation":{"apa":"Fung, E.-D., Adak, O., Lovat, G., Scarabelli, D., &#38; Venkataraman, L. (2017). Too hot for photon-assisted transport: Hot-electrons dominate conductance enhancement in illuminated single-molecule junctions. <i>Nano Letters</i>. American Chemical Society. <a href=\"https://doi.org/10.1021/acs.nanolett.6b05091\">https://doi.org/10.1021/acs.nanolett.6b05091</a>","chicago":"Fung, E-Dean, Olgun Adak, Giacomo Lovat, Diego Scarabelli, and Latha Venkataraman. “Too Hot for Photon-Assisted Transport: Hot-Electrons Dominate Conductance Enhancement in Illuminated Single-Molecule Junctions.” <i>Nano Letters</i>. American Chemical Society, 2017. <a href=\"https://doi.org/10.1021/acs.nanolett.6b05091\">https://doi.org/10.1021/acs.nanolett.6b05091</a>.","mla":"Fung, E. Dean, et al. “Too Hot for Photon-Assisted Transport: Hot-Electrons Dominate Conductance Enhancement in Illuminated Single-Molecule Junctions.” <i>Nano Letters</i>, vol. 17, no. 2, American Chemical Society, 2017, pp. 1255–61, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.6b05091\">10.1021/acs.nanolett.6b05091</a>.","ieee":"E.-D. Fung, O. Adak, G. Lovat, D. Scarabelli, and L. Venkataraman, “Too hot for photon-assisted transport: Hot-electrons dominate conductance enhancement in illuminated single-molecule junctions,” <i>Nano Letters</i>, vol. 17, no. 2. American Chemical Society, pp. 1255–1261, 2017.","ama":"Fung E-D, Adak O, Lovat G, Scarabelli D, Venkataraman L. Too hot for photon-assisted transport: Hot-electrons dominate conductance enhancement in illuminated single-molecule junctions. <i>Nano Letters</i>. 2017;17(2):1255-1261. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.6b05091\">10.1021/acs.nanolett.6b05091</a>","ista":"Fung E-D, Adak O, Lovat G, Scarabelli D, Venkataraman L. 2017. Too hot for photon-assisted transport: Hot-electrons dominate conductance enhancement in illuminated single-molecule junctions. Nano Letters. 17(2), 1255–1261.","short":"E.-D. Fung, O. Adak, G. Lovat, D. Scarabelli, L. Venkataraman, Nano Letters 17 (2017) 1255–1261."},"issue":"2","article_processing_charge":"No"}