Efficiency enhancement of small molecule organic solar cells using hexapropyltruxene as an interface layer

Ye, Hanyang; Kesava, Sameer Vajjala; Hardigree, Josué F. Martínez; Brown, Roisin E.; Mazzotta, Giulio; Skabara, Peter J.; Riede, Moritz

doi:10.1039/c9tc06845g

Cited by 6 publications

(6 citation statements)

References 65 publications

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“…Its energy is below the π − π * transition in SubPc and in accordance with the energies of the SubPc excitons observed from fluorescence emission measurements [41,47,48]. The observed 60 meV Stokes shift in our case, which is about 17 nm shift at 2.1 eV, is in agreement with the 8-30 nm (depending on the environment) observed in boron-subpthalocyanines [22,41,[49][50][51][52]. Since the excitons arise from the π − π * transitions-also reflected in the decrease in 2z of the π − π * transitions at 2.…”

Section: C60 On Phthalocyaninessupporting

confidence: 91%

“…In our previous work [22] we showed the use of PrT as an interface layer between MoOx and SubPc helping reduce exciton quenching leading to an increase in the short-circuit current density (J SC ). Such interlayers are regularly used to improve the performance of organic solar cells [53,54].…”

Section: C60 On Phthalocyaninesmentioning

confidence: 99%

“…iSE is an advanced application of SE which makes it possible to study the growth and evolution of the optical properties of multilayered thin films, e.g., semiconductors deposited by thermal evaporation under vacuum or other vapor-deposition methods [21][22][23]. (i)SE, in general, has an angstrom-level sensitivity towards changes in thicknesses.…”

Section: Introductionmentioning

confidence: 99%

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Direct observation and evolution of electronic coupling between organic semiconductors

Kesava

Riede

2021

Phys. Rev. Materials

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The electronic wave functions of an atom or molecule are affected by its interactions with its environment. These interactions dictate electronic and optical processes at interfaces, and is especially relevant in the case of thin film optoelectronic devices such as organic solar cells. In these devices, charge transport and interfaces between multiple layers occur along the thickness or vertical direction, and thus such electronic interactions between different molecules-same or different-are crucial in determining the device properties. Here, we introduce an in situ spectroscopic ellipsometry data analysis method called differential analysis in real time (DART) with the ability to directly probe electronic coupling due to intermolecular interactions along the thickness direction using vacuum-deposited organic semiconductor thin films as a model system. The analysis, which does not require any model fitting, reveals direct observations of electronic coupling between frontier orbitals under optical excitations leading to delocalization of the corresponding electronic wave functions with thickness or, equivalently, number of molecules away from the interface in C60 and MeO-TPD deposited on an insulating substrate (SiO 2 ). Applying the same methodology for C60 deposited on phthalocyanine thin films, the analyses shows strong, anomalous features-in comparison to C60 deposited on SiO 2 -of the electronic wave functions corresponding to specific excitation energies in C60 and phthalocyanines. Translation of such interactions in terms of dielectric constants reveals plasmonic type resonance absorptions resulting from oscillations of the excited state wave functions between the two materials across the interface. Finally, reproducibility, angstrom-level sensitivity, and simplicity of the method are highlighted showcasing its applicability for studying electronic coupling between any vapor-deposited material systems where real-time measurements during thin film growth are possible.

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Section: C60 On Phthalocyaninessupporting

confidence: 91%

Section: C60 On Phthalocyaninesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct observation and evolution of electronic coupling between organic semiconductors

Kesava

Riede

2021

Phys. Rev. Materials

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“…342 Another interesting example was recently reported by Ye and co-workers by introducing an hexapropyltruxene layer that reduced the exciton quenching at the MoO x /SubPc contact. 343…”

Section: Subphthalocyaninesmentioning

confidence: 99%

Recent advances in subphthalocyanines and related subporphyrinoids

et al. 2022

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“…11,19 The truxene platform has been used as a template for self-assembled subphthalocyanine films in organic solar cells. 20 Polyfluorenes have been extensively used as electroluminescent materials because they are efficient blue emitters in both the solution and solid state, they show high hole mobility, and excellent thermal and electrochemical stability. Furthermore, they are easily synthesized and their properties are tunable through modification of the structure or copolymerization.…”

Section: Introductionmentioning

confidence: 99%

Star-shaped oligofluorene truxene macromolecules – synthesis and properties as a function of alkyl chain length

Orofino¹,

Kanibolotsky²,

Skabara³

2021

Arkivoc

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Star-shaped oligofluorene truxenes are very promising materials and have demonstrated excellent properties as the gain medium in organic semiconductor lasers (OSLs). [1][2][3][4][5][6][7][8][9][10] Alkyl chains in oligofluorene truxenes act as solubilizing groups as well as spacers to prevent intermolecular π-π stacking that leads to quenching of the light emission. A new series of star-shaped systems analogous to hexyl oligofluorene truxenes 11 with alkyl chains of different lengths (butyl chains and octyl chains) was synthesized. The objective of this study was to investigate the effect of alkyl chain length on the film-forming properties of oligofluorene-truxene materials and, as a result, on their optoelectronic properties for applications as the gain medium in OSLs.

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Efficiency enhancement of small molecule organic solar cells using hexapropyltruxene as an interface layer

Abstract: The effect of a thin layer of hexapropyltruxene inserted at the interface between the electron donor boron subphthalocyanine chloride (SubPc) and its underlying hole contact in planar heterojunction solar cells was investigated.

Cited by 6 publications

References 65 publications

Direct observation and evolution of electronic coupling between organic semiconductors

Direct observation and evolution of electronic coupling between organic semiconductors

Recent advances in subphthalocyanines and related subporphyrinoids

Star-shaped oligofluorene truxene macromolecules – synthesis and properties as a function of alkyl chain length

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