Trap-limited carrier recombination in single-walled carbon nanotube heterojunctions with fullerene acceptor layers

Ferguson, Andrew J.; Dowgiallo, Anne Marie; Bindl, Dominick J.; Mistry, Kevin S.; Reid, Obadiah G.; Kopidakis, Nikos; Wang, Jialiang; Blackburn, Jeffrey L.

doi:10.1103/physrevb.91.245311

Cited by 31 publications

(79 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both transient decay profiles are fitted using a biexponential function with time constants τ i and associated amplitudes a i of τ 1 =27 ns ( a 1 =0.75) and τ 2 =212 ns ( a 2 =0.25), and yield the average lifetime τ avg of 161 ns, from τ avg =Σ i f i τ i , where f i is the fractional contribution of each time constant, which is ( a i τ i )/Σ j a j τ j . The different transient decay behaviour between solution-phase individualized SWCNTs and thin-film SWCNTs suggest that inter-tube junctions in SWCNT thin films possibly facilitate carrier recombination by serving as recombination sites 42 . In contrast, the longer-lived solution-phase TRMC transient decay dynamics probably represent more intrinsic intra-tube carrier-recombination dynamics, as inter-tube contact is prohibited in the highly individualized SWCNTs.…”

Section: Resultsmentioning

confidence: 99%

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

et al. 2015

Self Cite

View full text Add to dashboard Cite

Strong quantum confinement and low dielectric screening impart single-walled carbon nanotubes with exciton-binding energies substantially exceeding kBT at room temperature. Despite these large binding energies, reported photoluminescence quantum yields are typically low and some studies suggest that photoexcitation of carbon nanotube excitonic transitions can produce free charge carriers. Here we report the direct measurement of long-lived free-carrier generation in chirality-pure, single-walled carbon nanotubes in a low dielectric solvent. Time-resolved microwave conductivity enables contactless and quantitative measurement of the real and imaginary photoconductance of individually suspended nanotubes. The conditions of the microwave conductivity measurement allow us to avoid the complications of most previous measurements of nanotube free-carrier generation, including tube–tube/tube–electrode contact, dielectric screening by nearby excitons and many-body interactions. Even at low photon fluence (approximately 0.05 excitons per μm length of tubes), we directly observe free carriers on excitation of the first and second carbon nanotube exciton transitions.

show abstract

Section: Resultsmentioning

confidence: 99%

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Charge transfer (CT) exciton is a key to resolve a long-standing exciton dissociation problem in organic solar cells [1][2][3]. Although several effects such as interface dipole [4][5][6], disorder [7][8][9], carrier delocalization [10,11], effective mass [12], and entropy [13][14][15][16] have been investigated to understand why the CT exciton dissociates into free carriers efficiently at the dielectric interface, a physics behind the dissociation remains under debate. The CT exciton has been modeled as a pair of a mobile electron in the acceptor and a completely localized hole in the donor or vice versa [4,5,11,12,[16][17][18].…”

mentioning

confidence: 99%

“…This corresponds to taking both the limit of an infinite hole mass m h → ∞ and a strong localization σ z → 0, which leads to M → ∞, µ → m e , and R → r h . This treatment may be valid if one of the two phases is disordered [7][8][9][10][11]. Using Eq.…”

mentioning

confidence: 99%

Minimal model for charge transfer excitons at the dielectric interface

Ono

Ohno

2016

Phys. Rev. B

View full text Add to dashboard Cite

Theoretical description of the charge transfer (CT) exciton across the donor-acceptor interface without the use of a completely localized hole (or electron) is a challenge in the field of organic solar cells. We calculate the total wavefunction of the CT exciton by solving an effective two-particle Schrodinger equation for the inhomogeneous dielectric interface. We formulate the magnitude of the CT and construct a minimal model of the CT exciton under the breakdown of inversion symmetry. We demonstrate that both a light hole mass and a hole localization along the normal to the dielectric interface are crucial to yield the CT exciton

show abstract

“…[ 109 ] The SWNT–C 60 bilayer configuration formed type‐II heterojunctions by inducing a sufficient driving force for ET from the donor species, the SWNTs, and the C 60 acceptor molecules. [ 109–111 ] Excitons that were produced by photoexcitation of the first or second SWNT exciton transitions (S 11 and S 22 ,) diffused to the SWNT–C 60 interface, where exciton dissociation occurred [ 112,113 ] due to ultrafast ET. [ 109 ] In contrast, discerning the excitation states of the C 60 layer was accomplished using pump pulses which were resonant with C 60 excitonic transitions, and which can also boost exciton dissociations due to photoinduced hole transfer (PHT).…”

Section: Carbon Nanohybridsmentioning

confidence: 99%

Carbon Nanohybrids for Advanced Electronic Applications

Deshmukh

Park

Kang

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

Recently, carbon nanohybrids based on carbon nanomaterials including fullerene, carbon nanotube (CNT), carbon nanofiber (CNF), and graphene have attracted considerable attention in the field of science and technology due to their unique electrical, mechanical, chemical, spectroscopic properties, and high porosities. These nanohybrids not only increase electrical conductivity, but also enhance surface areas, thereby overcoming the limitations of individual carbon nanomaterial for material science and electronic engineering. Herein, the electronic and materials properties of carbon nanohybrids consisting of CNT/graphene, CNT/fullerene, CNT/CNF, and graphene/fullerene for advanced electronic applications are discussed.

show abstract

Trap-limited carrier recombination in single-walled carbon nanotube heterojunctions with fullerene acceptor layers

Cited by 31 publications

References 33 publications

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

Photoinduced spontaneous free-carrier generation in semiconducting single-walled carbon nanotubes

Minimal model for charge transfer excitons at the dielectric interface

Carbon Nanohybrids for Advanced Electronic Applications

Contact Info

Product

Resources

About