Optical conductivity and optical effective mass in a high-mobility organic semiconductor: Implications for the nature of charge transport

Li, Yuan; Yi, Yuanping; Coropceanu, Veaceslav; Brédas, Jean‐Luc

doi:10.1103/physrevb.90.245112

Cited by 16 publications

(12 citation statements)

References 47 publications

(155 reference statements)

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“…Alternatively, a decrease in effective mass by reducing T has been suggested theoretically as a fingerprint of weak e‐ph coupling in rubrene crystals displaying band‐like transport signatures. [ 36,37 ] At this stage we are unable to conclude the dominant mechanism, in any case, these observables do not alter the main conclusion derived from the T dependent analysis: impurity scattering limits free charge carrier motion in the samples. An observable which seems reasonable taking into account the non‐crystalline nature of the analysed samples.…”

Section: Resultsmentioning

confidence: 71%

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Ballabio

Zhang

Chen

et al. 2021

Adv Funct Materials

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We explore the charge transport properties of phytic acid (PA) doped polyaniline thin films prepared by the surfactant monolayer‐assisted interfacial synthesis (SMAIS). Structural and elemental analysis confirms the inclusion of PA in the thin films and reveals a progressive loss of crystallinity with the increase of PA doping content. Charge transport properties are interrogated by time‐resolved terahertz (THz) spectroscopy. Notably, independently of doping content and hence crystallinity, the frequency‐resolved complex conductivity spectra in the THz region can be properly described by the Drude model, demonstrating band‐like charge transport in the samples and state‐of‐the‐art charge carrier mobilities of ≈1 cm2V−1s−1. A temperature‐dependent analysis for the conductivity further supports band‐like charge transport and suggest that charge carrier mobility is primarily limited by impurity scattering. This work highlights the potential of PA doped polyaniline for organic electronics.

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Section: Resultsmentioning

confidence: 71%

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Ballabio

Zhang

Chen

et al. 2021

Adv Funct Materials

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“…In addition, a new optical conductivity peak in the low‐frequency region is found for the MTaO 3 /SrTiO 3 (010) compared to the bulk NaTaO 3 , KTaO 3 and SrTiO 3 . The optical conductivity peak at the low frequency involves the excitation of charge carriers from localised states to less localised states . Moreover, the intensity of peaks in the heterostructures shifted up upon going down the group due to the improved interfacial charge density.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO₃ with Perovskite‐Type Materials MTaO₃ (M=Na, K) for Environmental Remediation: A First‐Principles Study

et al. 2017

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Due to increasingly global environmental and energy crises, visible light semiconductor photocatalyst with a tunable bandgap and optical properties have received attention. This study aid in the design of bifunctional MTaO 3 /SrTiO 3 (010) (M = Na, K) heterostructure photocatalyst material for environmental remediation. In this study, the stability, electronic and optical properties of coupled MTaO 3 and SrTiO 3 are systematically studied using the hybrid HSE06 method. The MTaO 3 /SrTiO 3 (010) heterostructure show high photocatalytic activity under visible light irradiation with good stability and reduced bandgap compared to the bulk SrTiO 3 . The heterostructures formed a type-II band alignment to accelerates the interfacial charge transfer process and the photocatalytic activity. By comparing the relative ratio of effective mass, we could conclude that MTaO 3 /SrTiO 3 (010) heterostructure has not only superior mobility of charge carriers but also higher separation of photoinduced electrons and holes. The band alignment results showed that the MTaO 3 /SrTiO 3 (010) heterostructure are highly efficient for pollutants degradation and energy conversion. Significantly, the origin of the enhanced photocatalytic activity is observed from the O 2p state of SrTiO 3 to the Ta 5d state of MTaO 3 . In summary, this study shows a key role of SrTiO 3 as an electron donor to enhance the optical properties and stability of MTaO 3 /SrTiO 3 (010) heterostructure. * ) radicals. [9] The overall photocatalysis process mainly comprises three key steps, such as charge generation, transfer and consumption, [10] and this process resembles other solar energy conversion processes. [11] The desired efficiency of photocatalyst performance can be optimised only when all the three process is accomplished. Thus, enhancing the efficacy of each step in photocatalysis is an essential route to design new and [a] F. highly suitable photocatalyst materials for application in environmental remediation.Up to now, most reports are focused on TiO 2 with much less information available on other semiconductor-based photocatalysts. Therefore, to optimise the photocatalytic efficiency and offer a satisfactory benchmark for the future development of high-performance photocatalysts, the underlying mechanism of visible light photocatalytic materials are of great importance. Among the enormous active semiconductorbased photocatalysts, the perovskite strontium titanate (SrTiO 3 ) is a promising photocatalyst due to its non-toxicity, high resistance against photocorrosion, low cost, complete removal of contaminants, an abundance of constituent elements, as well as high thermal and chemical stability. [12] Moreover, SrTiO 3 provides a substantial energy for photocatalysis as a result of its high CB edge (-1.13 eV) compared to the most promising anatase TiO 2 (-0.29 eV). [13] Nevertheless, the wider bandgap (3.2 eV) restricts its practical applications to the ultraviolet (UV) region, [14] which comprises 5% of the solar energy. [15] For an effective solar energ...

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“…The UV-Vis spectra collected in the current study served to analyze the refractive index, dielectric constant, and optical conductivity of the samples (see Table 1 ). Optical conductivity is a key parameter to evaluate optoelectronic materials and has been previously employed to probe carrier dynamic in organic semiconductors [ 46 ]. It is related to the electrical conductivity within a variable electric field.…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence Quenching and Enhanced Optical Conductivity of P3HT-Derived Ho3+-Doped ZnO Nanostructures

et al. 2016

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In this article, we demonstrate the surface effect and optoelectronic properties of holmium (Ho3+)-doped ZnO in P3HT polymer nanocomposite. We incorporated ZnO:Ho3+ (0.5 mol% Ho) nanostructures in the pristine P3HT-conjugated polymer and systematically studied the effect of the nanostructures on the optical characteristics. Detailed UV-Vis spectroscopy analysis revealed enhanced absorption coefficient and optical conductivity in the P3HT-ZnO:Ho3+ film as compared to the pristine P3HT. Moreover, the obtained photoluminescence (PL) results established the improvement of exciton dissociation as a result of ZnO:Ho3+ nanostructures inclusion. The occurrence of PL quenching is the result of enhanced charge transfer due to ZnO:Ho3+ nanostructures in the polymer, whereas energy transfer from ZnO:Ho3+ to P3HT was verified. Overall, the current investigation revealed a systematic tailoring of the optoelectronic properties of pristine P3HT after inclusion of ZnO:Ho3+ nanostructures, thus opening brilliant perspectives for applications in various optoelectronic devices.

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Optical conductivity and optical effective mass in a high-mobility organic semiconductor: Implications for the nature of charge transport

Cited by 16 publications

References 47 publications

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO₃ with Perovskite‐Type Materials MTaO₃ (M=Na, K) for Environmental Remediation: A First‐Principles Study

Photoluminescence Quenching and Enhanced Optical Conductivity of P3HT-Derived Ho3+-Doped ZnO Nanostructures

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Optical conductivity and optical effective mass in a high-mobility organic semiconductor: Implications for the nature of charge transport

Cited by 16 publications

References 47 publications

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Band‐Like Charge Transport in Phytic Acid‐Doped Polyaniline Thin Films

Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO3 with Perovskite‐Type Materials MTaO3 (M=Na, K) for Environmental Remediation: A First‐Principles Study

Photoluminescence Quenching and Enhanced Optical Conductivity of P3HT-Derived Ho3+-Doped ZnO Nanostructures

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Enhancing Charge Separation and Photocatalytic Activity of Cubic SrTiO₃ with Perovskite‐Type Materials MTaO₃ (M=Na, K) for Environmental Remediation: A First‐Principles Study