Structure and optical properties of C60 thin films

Faiman, D.; Goren, S. D.; Katz, Eugene A.; Koltun, M. M.; Mel’nik, N. N.; Shames, Alexander I.; Shtutina, S.

doi:10.1016/s0040-6090(96)09043-8

Cited by 41 publications

(25 citation statements)

References 13 publications

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“…The spectral dependences of the absorption coefficient α = 4πk/λ for the investigated C 60 films, plotted in coordinates (αhν) 2 , (αhν) It is seen that optical parameters of C 60 thin films near the fundamental absorption edge are affected not only by the C 60 deposition rate and substrate temperature [1,4,8], but also by mechanical stresses in heterostructure, dependent on substrate crystallinity (Si or SiO 2 in our case) and the C 60 film thickness. The decrease of the near-edge optical absorption parameters of C 60 films deposited on thermally oxidized Si substrate was observed in the case of nanosize (≤1 nm) metal overlayer.…”

Section: Resultsmentioning

confidence: 98%

“…The optical absorption band gap of C 60 films was shown to depend on their degree of crystallinity [1] that in turn can be dependent both on the deposition conditions and on the internal mechanical stresses [2] in heterostructures. The C 60 film growth under vacuum evaporation starts as islands, but with increasing the film thickness both the grains shape and size are dependent on the type of substrate material (amorphous or crystalline), its temperature and evaporation rate [3].…”

Section: Introductionmentioning

confidence: 99%

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Effect of nanosize metal overlayer on C60 thin film optical parameters near fundamental absorption edge

Basiuk¹,

Lashkaryov²

2012

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The effect of nanosize metal overlayer, both evaporated on C 60 films (Bi, In) and attached as nanoparticles of (Ag, Au), on the optical parameters of C 60 films near the fundamental absorption edge has been studied. The values of direct band gap (E g ), the optical gap (E o ) in the framework of Tauc model and the Urbach tail parameter (E U ) were determined from the absorption coefficient (α) spectra plotted in coordinates (αhν) 2 , (αhν) 1/2 , ln(α) vs hν, respectively. Parameters obtained testify diminishing the structural disorder in C 60 thin films with nanosize metal overlayer at optimal ratio of C 60 to metal layer thicknesses.Keywords: C 60 fullerene film, metal nanolayer, optical parameters, fundamental absorption edge.Manuscript received 29.12.11.; revised version received 11.01.12; accepted for publication 26.01.12; published online 29.03.12.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effect of nanosize metal overlayer on C60 thin film optical parameters near fundamental absorption edge

Basiuk¹,

Lashkaryov²

2012

Semicond. Phys. Quantum Electron. Optoelectron.

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“…This observation is in good agreement with other reports. [34][35][36][37] The XRD patterns of heterostructures consisting of pentacene/C 60 /Au NPs and pentacene/C 60 exhibit a peak at 5.74°, corresponding to nificant differences from the samples without Au NPs (Figure 2f and h) in average grain size and shape. This result indicates that the monolayer of Au NPs has negligible influence on the crystallinity of C 60 and pentacene.…”

Section: Doi: 101002/adma201104375mentioning

confidence: 99%

Controlled Ambipolar Charge Transport Through a Self‐Assembled Gold Nanoparticle Monolayer

Zhou

Han

et al. 2012

Advanced Materials

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An active mechanism for controlling ambipolar charge transport is developed based on self-assembled monolayers of gold nanoparticles. Electron and hole currents are manipulated by controlling the gate bias in order to overcome the intrinsic material limitations. The endurance and retention measurements confirm that this method exhibits good electrical reliability and stability. This solution process approach has potential for applications in large-area printed electronic devices.

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“…Examples of specific applications that have incorporated fullerene materials are optical limiting devices, 1,2 sensors, 3 polymer-based solar cells, [4][5][6][7] and solar sensitizers for wide-bandgap materials. [8][9][10][11] Several different synthetic methods for preparing films of fullerenes and derivates have been demonstrated, including thermal evaporation, 12,13 Langmuir-Blodgett film deposition, [14][15][16] monolayer adsorption on metals, 17,18 self-assembly of monolayers, 8,14 solution casting, 19,20 polymer blends, 21 and sol-gel 22 methods. The major limitations of the previous synthetic methods include poor morphological control, limits on film area and substrate geometry, limits on film thickness ͑Ͻ100 nm͒, 23 and high costs associated with some of these techniques.…”

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confidence: 99%

Low-Voltage Electrodeposition of Fullerol Thin Films from Aqueous Solutions

Kleiman‐Shwarsctein¹,

Jaramillo²,

Baeck³

et al. 2006

J. Electrochem. Soc.

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A low-voltage ͑Ͻ2 V, three-electrode system͒ method for the cathodic electrodeposition of fullerol ͓polyhydroxylated fullerene, C 60 ͑OH͒ n ͔ from an aqueous solution has been developed for the synthesis of thin films. Scanning electron microscopy of the electrodeposited fullerol films shows that the films are microscopically uniform; the film thickness was observed to vary linearly with the deposition charge. X-ray photoelectron spectroscopy of the C 1s peak indicates that the carbon constituents of the electrodeposited films are electronically similar to the fullerol precursor. Infrared spectroscopy ͑IRS͒ confirmed that the fullerol moiety is intact upon electrodeposition and that the films are thermally stable up to 150°C. At higher temperatures IRS data suggest there is cleavage of a ketal or hemiketal group followed by hydroxyl group cleavage. The ͑direct͒ optical bandgap obtained from UV-visible spectroscopy of the electrodeposited film was 2.6 eV.Fullerene and its derivates have been widely investigated during the last decade. The unique properties of C 60 have been thought to have potential applications in a variety of areas, including optoelectronics, catalysis, superconductivity, and medical therapeutics. Examples of specific applications that have incorporated fullerene materials are optical limiting devices, 1,2 sensors, 3 polymer-based solar cells, 4-7 and solar sensitizers for wide-bandgap materials. [8][9][10][11] Several different synthetic methods for preparing films of fullerenes and derivates have been demonstrated, including thermal evaporation, 12,13 Langmuir-Blodgett film deposition, 14-16 monolayer adsorption on metals, 17,18 self-assembly of monolayers, 8,14 solution casting, 19,20 polymer blends, 21 and sol-gel 22 methods. The major limitations of the previous synthetic methods include poor morphological control, limits on film area and substrate geometry, limits on film thickness ͑Ͻ100 nm͒, 23 and high costs associated with some of these techniques.Electrochemical deposition of C 60 or its derivates is particularly attractive because of the suitability to commercial applications. Commercial electrodeposition is relatively low-cost and has a high degree of process control. One example is cathodic electropolymerization, which has been used to synthesize fullerene-containing polymers including fullerene epoxide ͑C 60 O͒ polymers from fullerene in the presence of oxygen 24,25 and directly from C 60 O. 26,27 Fullerene derivate polymers containing metal groups such as Ir in C 60 ͕Ir͑CO͒ 2 ͖ n 28 and other metals 29,30 have also been synthesized. Various other fullerene polymers have also been electrodeposited/electropolymerized 31-34 to fabricate thin films. These methods require nonaqueous solvents and in some cases an oxygen-free electrolyte, which could make the process difficult to commercialize. Cation intercalation in the electropolymerized film has been observed in some cases, 26 which would be undesirable for certain applications. Kamat et al. 35,36 and others 37 have used electrochemi...

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Structure and optical properties of C60 thin films

Cited by 41 publications

References 13 publications

Effect of nanosize metal overlayer on C60 thin film optical parameters near fundamental absorption edge

Effect of nanosize metal overlayer on C60 thin film optical parameters near fundamental absorption edge

Controlled Ambipolar Charge Transport Through a Self‐Assembled Gold Nanoparticle Monolayer

Low-Voltage Electrodeposition of Fullerol Thin Films from Aqueous Solutions

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