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Paola Barbara
Georgetown University
105Publications
19H-index
1,354Citations
Publications 107
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#1Luke St. MarieH-Index: 1
#2Abdel El FatimyH-Index: 3
Last.Paola BarbaraH-Index: 19
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#1Abdel El Fatimy (Georgetown University)H-Index: 3
#2Peize Han (Georgetown University)H-Index: 1
Last.Paola Barbara (Georgetown University)H-Index: 19
view all 12 authors...
Abstract At high phonon temperature, defect-mediated electron-phonon collisions (supercollisions) in graphene allow for larger energy transfer and faster cooling of hot electrons than the normal, momentum-conserving electron-phonon collisions. Disorder also affects the heat flow between electrons and phonons at very low phonon temperature, where the phonon wavelength exceeds the mean free path. In both cases, the cooling rate is predicted to exhibit a characteristic cubic power law dependence on...
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#2Petr NeugebauerH-Index: 12
Last.Paola BarbaraH-Index: 19
view all 8 authors...
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#1Peize HanH-Index: 1
#2Eli R AdlerH-Index: 1
Last.Paola BarbaraH-Index: 19
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Atomically thin transition metal dichalcogenides (TMDs) are ideal candidates for ultrathin optoelectronics that are flexible and semitransparent. Photodetectors based on TMDs show remarkable performance, with responsivity and detectivity higher than 103 AW−1 and 1012 Jones, respectively, but they are plagued by response times as slow as several tens of seconds. Although it is well established that gas adsorbates such as water and oxygen create charge traps and significantly increase both the res...
1 CitationsSource
#1Abdel El FatimyH-Index: 3
#2Peize HanH-Index: 1
Last.Paola BarbaraH-Index: 19
view all 12 authors...
At high phonon temperature, defect-mediated electron-phonon collisions (supercollisions) in graphene allow for larger energy transfer and faster cooling of hot electrons than the normal, momentum-conserving electron-phonon collisions. Disorder also affects the heat flow between electrons and phonons at very low phonon temperature, where the phonon wavelength exceeds the mean free path. In both cases, the cooling rate is predicted to exhibit a characteristic cubic power law dependence on the elec...
#1Peize HanH-Index: 1
#2Eli AdlerH-Index: 1
Last.Paola BarbaraH-Index: 19
view all 6 authors...
#1Abdel El Fatimy (Georgetown University)H-Index: 3
#2Luke St. Marie (Georgetown University)H-Index: 1
Last.Paola Barbara (Georgetown University)H-Index: 19
view all 11 authors...
Atomically thin materials like semimetallic graphene and semiconducting transition metal dichalcogenides (TMDs) are an ideal platform for ultra-thin optoelectronic devices due to their direct bandgap (for monolayer thickness) and their considerable light absorption. For devices based on semiconducting TMDs, light detection occurs by optical excitation of charge carriers above the bandgap. For gapless graphene, light absorption causes a large increase in electron temperature, because of its small...
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#1Peize Han (Georgetown University)H-Index: 1
#2Luke St. Marie (Georgetown University)H-Index: 1
Last.Paola Barbara (Georgetown University)H-Index: 19
view all 7 authors...
Two-dimensional materials such as graphene and transition metal dichalcogenides (TMDs) are ideal candidates to create ultra-thin electronics suitable for flexible substrates. Although optoelectronic devices based on TMDs have demonstrated remarkable performance, scalability is still a significant issue. Most devices are created using techniques that are not suitable for mass production, such as mechanical exfoliation of monolayer flakes and patterning by electron-beam lithography. Here we show t...
6 CitationsSource
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