Growth of iron phthalocyanine nanoweb and nanobrush using molecular beam epitaxy

Debnath, A.K.; Samanta, Soumen; Singh, Ajay; Aswal, D. K.; Gupta, Santosh K.; Yakhmi, J. V.; Deshpande, S. K.; Poswal, A.K.; Sürgers, Christoph

doi:10.1016/j.physe.2008.06.022

Cited by 37 publications

(23 citation statements)

References 65 publications

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“…intermolecular excitation) and has a doublet due to Davydov splitting. 59 The difference in the 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 relative orientation of the molecules decides the extent of Davydov splitting. From Figure 12(a) it is evident that magnitude of Davydov splitting remains same at low thickness of CoPc but at higher thickness (~ 25 nm) of CoPc it enhances, which is consistent with the fact that at low thickness CoPc grows randomly on ZnO but at higher thickness it attains a crystalline nature.…”

Section: Resultsmentioning

confidence: 99%

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Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor

Kumar¹,

Samanta²,

Singh³

et al. 2015

ACS Appl. Mater. Interfaces

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The room temperature chemiresistive response of n-type ZnO nanowire (ZnO NWs) films modified with different thicknesses of p-type cobalt phthalocyanine (CoPc) has been studied. With increasing thickness of CoPc (>15 nm), heterojunction films exhibit a transition from n- to p-type conduction due to uniform coating of CoPc on ZnO. The heterojunction films prepared with a 25 nm thick CoPc layer exhibit the highest response (268% at 10 ppm of H2S) and the fastest response (26 s) among all samples. The X-ray photoelectron spectroscopy and work function measurements reveal that electron transfer takes place from ZnO to CoPc, resulting in formation of a p-n junction with a barrier height of 0.4 eV and a depletion layer width of ∼8.9 nm. The detailed XPS analysis suggests that these heterojunction films with 25 nm thick CoPc exhibit the least content of chemisorbed oxygen, enabling the direct interaction of H2S with the CoPc molecule, and therefore exhibit the fastest response. The improved response is attributed to the high susceptibility of the p-n junctions to the H2S gas, which manipulates the depletion layer width and controls the charge transport.

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Section: Resultsmentioning

confidence: 99%

“…It is very important to note that for ZnO-CoPc (25nm) sample we observe a peak at 2.7 eV, the origin of which is attributed to the charge transfer (CT) excitation that is an intermolecular excitation. 59 The energy band gap has been obtained from the electronic absorption spectra using relation:…”

Section: Resultsmentioning

confidence: 99%

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor

Kumar¹,

Samanta²,

Singh³

et al. 2015

ACS Appl. Mater. Interfaces

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“…The effect of size difference of unit cells of organic molecules and the inorganic substrate as well as molecule-substrate interaction leads to translational and orientational domains, which are the sources of disorder [16]. The subsequent growth of the film is accomplished by the interplay of molecule-molecule and molecule-substrate interaction [19].…”

Section: Resultsmentioning

confidence: 99%

Study of interfaces in organic semiconductor heterojunctions

Maheshwari

Dutta

Sudarshan

et al. 2011

J. Phys.: Conf. Ser.

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“…These have been exploited in light emitting diodes, field effect transistors, photovoltaic cells and electronic memory devices [2][3][4][5]. FePc films were recently deposited by molecular beam epitaxy [6]. It was found that due to substrate-molecule and molecule-molecule interactions, the film grows in various morphologies, which is a function of deposition rate, substrate temperature and thickness (Fig.…”

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confidence: 99%

“…When substrate-molecule interaction dominates stacking of the molecules will be edge-on. However, molecules stack in face-on manner if molecule-molecule interaction dominates [6].…”

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confidence: 99%

Study of iron phthalocyanine organic semiconductor thin films using slow positron beam

Maheshwari

Dutta

Samanta

et al. 2009

Phys. Status Solidi (c)

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Iron phthalocyanine (FePc) thin films grown by molecular beam epitaxy have been studied using slow positron beam and atomic force microscopy (AFM) techniques. A correlation between microstructure investigated using these two techniques as a function of film thickness (50‐140 nm) and crystallinity (amorphous and crystalline) is examined. Doppler broadening measurements revealed higher S‐parameter in amorphous film indicating more defects as compared to crystalline film. For crystalline films, as the thickness increases the S‐parameter increases, indicating the defect densities (free volume for positron annihilation) increases. However, AFM studies show that thinner film has columnar grains that transform to granular form with increase in thickness. The former shows wider grain boundaries which can not be sensed by positron. On the other hand, it reveals that columnar grains are more orderly arranged with small free volume inside the grain. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Growth of iron phthalocyanine nanoweb and nanobrush using molecular beam epitaxy

Cited by 37 publications

References 65 publications

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor

Study of interfaces in organic semiconductor heterojunctions

Study of iron phthalocyanine organic semiconductor thin films using slow positron beam

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Growth of iron phthalocyanine nanoweb and nanobrush using molecular beam epitaxy

Cited by 37 publications

References 65 publications

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H2S Sensor

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H2S Sensor

Study of interfaces in organic semiconductor heterojunctions

Study of iron phthalocyanine organic semiconductor thin films using slow positron beam

Contact Info

Product

Resources

About

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor

Fast Response and High Sensitivity of ZnO Nanowires—Cobalt Phthalocyanine Heterojunction Based H₂S Sensor