Bistable organic memory device with gold nanoparticles embedded in a conducting poly(N -vinylcarbazole) colloids hybrid

Dong Ick Son, Dong Hee Park, Jong Bin Kim, Ji Won Choi, Tae Whan Kim, Basavaraj Angadi, Yeonjin Yi, Won Kook Choi

Research output: Contribution to journalArticle

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Abstract

We report on the nonvolatile memory characteristics of a bistable organic memory (BOM) device with Au nanoparticles (NPs) embedded in a conducting poly(N-vinylcarbazole) (PVK) colloids hybrid layer deposited on flexible poly(ethyleneterephthalate) (PET) substrates. Transmission electron microscopy (TEM) images show the Au nanoparticles distributed isotropically around the surface of a PVK colloid. The average induced charge on Au nanoparticles, estimated using the C-V hysteresis curve, was large, as much as 5 holes/NP at a sweeping voltage of ±3 V. The maximum ON/OFF ratio of the current bistability in the BOM devices was as large as 1 × 105. The cycling endurance tests of the ON/OFF switching exhibited a high endurance of above 1.5 × 105 cycles, and a high ON/OFF ratio of ∼10 5 could be achieved consistently even after quite a long retention time of more than 1 × 106 s. To clarify the memory mechanism of the hole-mediated bistable organic memory device, the interactions between Au nanoparticles and poly(N-vinylcarbazole) colloids was studied by estimating the density of states and projected density of state calculations using density functional theory. Au atom interactions with a PVK unit decreased the band gap by 2.96 eV with the new induced gap states at 5.11 eV (HOMO, E0) and LUMO 4.30 eV and relaxed the HOMO level by 0.5 eV (E1). E1 at ∼6.2 eV is very close to the pristine HOMO, and thus the trapped hole in E1 could move to the HOMO of pristine PVK. From the experimental data and theoretical calculation, it was revealed that a low-conductivity state resulted from a hole trapping at Eo and E1 states and subsequent hole transportation through Fowler-Nordheim tunneling from E 1 state to Au NPs and/or interface trap states leads to a high conductivity state.

Original languageEnglish
Pages (from-to)2341-2348
Number of pages8
JournalJournal of Physical Chemistry C
Volume115
Issue number5
DOIs
Publication statusPublished - 2011 Feb 10

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Colloids
Gold
colloids
gold
Nanoparticles
Data storage equipment
conduction
nanoparticles
endurance
Durability
cycles
low conductivity
Field emission
Density functional theory
Hysteresis
poly-N-vinylcarbazole
Energy gap
estimating
trapping
hysteresis

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Son, Dong Ick ; Park, Dong Hee ; Kim, Jong Bin ; Choi, Ji Won ; Kim, Tae Whan ; Angadi, Basavaraj ; Yi, Yeonjin ; Choi, Won Kook. / Bistable organic memory device with gold nanoparticles embedded in a conducting poly(N -vinylcarbazole) colloids hybrid. In: Journal of Physical Chemistry C. 2011 ; Vol. 115, No. 5. pp. 2341-2348.
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abstract = "We report on the nonvolatile memory characteristics of a bistable organic memory (BOM) device with Au nanoparticles (NPs) embedded in a conducting poly(N-vinylcarbazole) (PVK) colloids hybrid layer deposited on flexible poly(ethyleneterephthalate) (PET) substrates. Transmission electron microscopy (TEM) images show the Au nanoparticles distributed isotropically around the surface of a PVK colloid. The average induced charge on Au nanoparticles, estimated using the C-V hysteresis curve, was large, as much as 5 holes/NP at a sweeping voltage of ±3 V. The maximum ON/OFF ratio of the current bistability in the BOM devices was as large as 1 × 105. The cycling endurance tests of the ON/OFF switching exhibited a high endurance of above 1.5 × 105 cycles, and a high ON/OFF ratio of ∼10 5 could be achieved consistently even after quite a long retention time of more than 1 × 106 s. To clarify the memory mechanism of the hole-mediated bistable organic memory device, the interactions between Au nanoparticles and poly(N-vinylcarbazole) colloids was studied by estimating the density of states and projected density of state calculations using density functional theory. Au atom interactions with a PVK unit decreased the band gap by 2.96 eV with the new induced gap states at 5.11 eV (HOMO, E0) and LUMO 4.30 eV and relaxed the HOMO level by 0.5 eV (E1). E1 at ∼6.2 eV is very close to the pristine HOMO, and thus the trapped hole in E1 could move to the HOMO of pristine PVK. From the experimental data and theoretical calculation, it was revealed that a low-conductivity state resulted from a hole trapping at Eo and E1 states and subsequent hole transportation through Fowler-Nordheim tunneling from E 1 state to Au NPs and/or interface trap states leads to a high conductivity state.",
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Bistable organic memory device with gold nanoparticles embedded in a conducting poly(N -vinylcarbazole) colloids hybrid. / Son, Dong Ick; Park, Dong Hee; Kim, Jong Bin; Choi, Ji Won; Kim, Tae Whan; Angadi, Basavaraj; Yi, Yeonjin; Choi, Won Kook.

In: Journal of Physical Chemistry C, Vol. 115, No. 5, 10.02.2011, p. 2341-2348.

Research output: Contribution to journalArticle

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T1 - Bistable organic memory device with gold nanoparticles embedded in a conducting poly(N -vinylcarbazole) colloids hybrid

AU - Son, Dong Ick

AU - Park, Dong Hee

AU - Kim, Jong Bin

AU - Choi, Ji Won

AU - Kim, Tae Whan

AU - Angadi, Basavaraj

AU - Yi, Yeonjin

AU - Choi, Won Kook

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N2 - We report on the nonvolatile memory characteristics of a bistable organic memory (BOM) device with Au nanoparticles (NPs) embedded in a conducting poly(N-vinylcarbazole) (PVK) colloids hybrid layer deposited on flexible poly(ethyleneterephthalate) (PET) substrates. Transmission electron microscopy (TEM) images show the Au nanoparticles distributed isotropically around the surface of a PVK colloid. The average induced charge on Au nanoparticles, estimated using the C-V hysteresis curve, was large, as much as 5 holes/NP at a sweeping voltage of ±3 V. The maximum ON/OFF ratio of the current bistability in the BOM devices was as large as 1 × 105. The cycling endurance tests of the ON/OFF switching exhibited a high endurance of above 1.5 × 105 cycles, and a high ON/OFF ratio of ∼10 5 could be achieved consistently even after quite a long retention time of more than 1 × 106 s. To clarify the memory mechanism of the hole-mediated bistable organic memory device, the interactions between Au nanoparticles and poly(N-vinylcarbazole) colloids was studied by estimating the density of states and projected density of state calculations using density functional theory. Au atom interactions with a PVK unit decreased the band gap by 2.96 eV with the new induced gap states at 5.11 eV (HOMO, E0) and LUMO 4.30 eV and relaxed the HOMO level by 0.5 eV (E1). E1 at ∼6.2 eV is very close to the pristine HOMO, and thus the trapped hole in E1 could move to the HOMO of pristine PVK. From the experimental data and theoretical calculation, it was revealed that a low-conductivity state resulted from a hole trapping at Eo and E1 states and subsequent hole transportation through Fowler-Nordheim tunneling from E 1 state to Au NPs and/or interface trap states leads to a high conductivity state.

AB - We report on the nonvolatile memory characteristics of a bistable organic memory (BOM) device with Au nanoparticles (NPs) embedded in a conducting poly(N-vinylcarbazole) (PVK) colloids hybrid layer deposited on flexible poly(ethyleneterephthalate) (PET) substrates. Transmission electron microscopy (TEM) images show the Au nanoparticles distributed isotropically around the surface of a PVK colloid. The average induced charge on Au nanoparticles, estimated using the C-V hysteresis curve, was large, as much as 5 holes/NP at a sweeping voltage of ±3 V. The maximum ON/OFF ratio of the current bistability in the BOM devices was as large as 1 × 105. The cycling endurance tests of the ON/OFF switching exhibited a high endurance of above 1.5 × 105 cycles, and a high ON/OFF ratio of ∼10 5 could be achieved consistently even after quite a long retention time of more than 1 × 106 s. To clarify the memory mechanism of the hole-mediated bistable organic memory device, the interactions between Au nanoparticles and poly(N-vinylcarbazole) colloids was studied by estimating the density of states and projected density of state calculations using density functional theory. Au atom interactions with a PVK unit decreased the band gap by 2.96 eV with the new induced gap states at 5.11 eV (HOMO, E0) and LUMO 4.30 eV and relaxed the HOMO level by 0.5 eV (E1). E1 at ∼6.2 eV is very close to the pristine HOMO, and thus the trapped hole in E1 could move to the HOMO of pristine PVK. From the experimental data and theoretical calculation, it was revealed that a low-conductivity state resulted from a hole trapping at Eo and E1 states and subsequent hole transportation through Fowler-Nordheim tunneling from E 1 state to Au NPs and/or interface trap states leads to a high conductivity state.

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