Hot Carrier Transport and Photocurrent Response in Graphene
Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of h...
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| Veröffentlicht in: | Nano letters 2011-11, Vol.11 (11), p.4688-4692 |
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| container_end_page | 4692 |
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| container_issue | 11 |
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| container_title | Nano letters |
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| creator | Song, Justin C. W Rudner, Mark S Marcus, Charles M Levitov, Leonid S |
| description | Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers. The hot-carrier-mediated energy transport dominates the photoresponse and manifests itself in quantum efficiencies that can exceed unity, as well as in a characteristic dependence of the photocurrent on gate voltages. The pattern of multiple photocurrent sign changes as a function of gate voltage provides a fingerprint of hot-carrier-dominated transport and carrier multiplication. |
| doi_str_mv | 10.1021/nl202318u |
| format | Article |
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W</creatorcontrib><creatorcontrib>Rudner, Mark S</creatorcontrib><creatorcontrib>Marcus, Charles M</creatorcontrib><creatorcontrib>Levitov, Leonid S</creatorcontrib><title>Hot Carrier Transport and Photocurrent Response in Graphene</title><title>Nano letters</title><addtitle>Nano Lett</addtitle><description>Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers. The hot-carrier-mediated energy transport dominates the photoresponse and manifests itself in quantum efficiencies that can exceed unity, as well as in a characteristic dependence of the photocurrent on gate voltages. The pattern of multiple photocurrent sign changes as a function of gate voltage provides a fingerprint of hot-carrier-dominated transport and carrier multiplication.</description><subject>Carriers</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Electric Conductivity</subject><subject>Electric potential</subject><subject>Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures</subject><subject>Electronic transport phenomena in thin films and low-dimensional structures</subject><subject>Exact sciences and technology</subject><subject>Fullerenes and related materials; diamonds, graphite</subject><subject>Gates</subject><subject>Graphene</subject><subject>Graphite - chemistry</subject><subject>Graphite - radiation effects</subject><subject>Light</subject><subject>Materials science</subject><subject>Materials Testing</subject><subject>Multiplication</subject><subject>Nanostructures - chemistry</subject><subject>Nanostructures - radiation effects</subject><subject>Photoconduction and photovoltaic effects; photodielectric effects</subject><subject>Photocurrent</subject><subject>Photoelectric effect</subject><subject>Physics</subject><subject>Radiation Dosage</subject><subject>Specific materials</subject><subject>Transport</subject><subject>Voltage</subject><issn>1530-6984</issn><issn>1530-6992</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp90M9LwzAUwPEgipvTg_-A9CLqoZpfTRN2kqGbMFBknstrmrKOLqlJe_C_t7pZL-IpD_LhPfgidE7wLcGU3NmaYsqI7A7QmCQMx0IpejjMko_QSQgbjLFiCT5GI0oUE4mQYzRduDaagfeV8dHKgw2N820Etohe1q51uvPe2DZ6Nf2HDSaqbDT30KyNNafoqIQ6mLP9O0Fvjw-r2SJePs-fZvfLGHgq2zhlxNBcK1kQwYAWiuqUUeBFjqXiQJUUJeQ8p4aXHARNRS6Ak8KkpcxLXbAJutrtbbx770xos20VtKlrsMZ1IVOYEc4lJ728_leSVFCcUPpNb3ZUexeCN2XW-GoL_iMjOPuqmg1Ve3uxX9vlW1MM8idjDy73AIKGuuw76ir8Op5ygns8ONAh27jO277bHwc_AZqmigc</recordid><startdate>20111109</startdate><enddate>20111109</enddate><creator>Song, Justin C. 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W ; Rudner, Mark S ; Marcus, Charles M ; Levitov, Leonid S</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a478t-731e2bc98d163a2d92c732a4db0894a2986fab4b2e4f4a6276b6a41de7f8bfcd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Carriers</topic><topic>Condensed matter: electronic structure, electrical, magnetic, and optical properties</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Electric Conductivity</topic><topic>Electric potential</topic><topic>Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures</topic><topic>Electronic transport phenomena in thin films and low-dimensional structures</topic><topic>Exact sciences and technology</topic><topic>Fullerenes and related materials; diamonds, graphite</topic><topic>Gates</topic><topic>Graphene</topic><topic>Graphite - chemistry</topic><topic>Graphite - radiation effects</topic><topic>Light</topic><topic>Materials science</topic><topic>Materials Testing</topic><topic>Multiplication</topic><topic>Nanostructures - chemistry</topic><topic>Nanostructures - radiation effects</topic><topic>Photoconduction and photovoltaic effects; photodielectric effects</topic><topic>Photocurrent</topic><topic>Photoelectric effect</topic><topic>Physics</topic><topic>Radiation Dosage</topic><topic>Specific materials</topic><topic>Transport</topic><topic>Voltage</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Song, Justin C. 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| subjects | Carriers Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Electric Conductivity Electric potential Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronic transport phenomena in thin films and low-dimensional structures Exact sciences and technology Fullerenes and related materials diamonds, graphite Gates Graphene Graphite - chemistry Graphite - radiation effects Light Materials science Materials Testing Multiplication Nanostructures - chemistry Nanostructures - radiation effects Photoconduction and photovoltaic effects photodielectric effects Photocurrent Photoelectric effect Physics Radiation Dosage Specific materials Transport Voltage |
| title | Hot Carrier Transport and Photocurrent Response in Graphene |
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