Converting Wannier into Frenkel Excitons in an Inorganic/Organic Hybrid Semiconductor Nanostructure

Blumstengel, S.; Sadofev, Sergey; Xu, Chao; Puls, J.; Henneberger, F.

doi:10.1103/physrevlett.97.237401

Cited by 124 publications

(121 citation statements)

References 19 publications

Supporting

Mentioning

114

Contrasting

Order By: Relevance

“…In HIOS comprised of a ZnO quantum well (QW) and an adjacent organic layer, efficient conversion of Wannier excitons into Frenkel excitons via F€ orster-type resonant energy transfer (FRET) has been demonstrated. 1,2 Similar observations were made for GaN, InGaN, or GaAS as donor material. [3][4][5] In this way, the difficulty of injecting high carrier densities directly into the organic material can be circumvented.…”

supporting

confidence: 59%

Cascade energy transfer versus charge separation in ladder-type oligo(p-phenylene)/ZnO hybrid structures for light-emitting applications

Bianchi

Sadofev

Schlesinger

et al. 2014

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

Usability of inorganic/organic semiconductor hybrid structures for light-emitting applications can be intrinsically limited by an unfavorable interfacial energy level alignment causing charge separation and nonradiative deactivation. Introducing cascaded energy transfer funneling away the excitation energy from the interface by transfer to a secondary acceptor molecule enables us to overcome this issue. We demonstrate a substantial recovery of the light output along with high inorganic-to-organic exciton conversion rates up to room temperature.

show abstract

supporting

confidence: 59%

Cascade energy transfer versus charge separation in ladder-type oligo(p-phenylene)/ZnO hybrid structures for light-emitting applications

Bianchi

Sadofev

Schlesinger

et al. 2014

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…A potential advantage of hybrid inorganic-organic systems over their individual constituents is that a synergistic combination can lead to enhanced optoelectronic properties and tunable functionality [1][2][3][4][5][6][7][8][9]. Typical components include organic materials such as organic dye molecules, and inorganic semiconductor nanostructures such as a quantum well (QW) or a semiconductor surface [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Theory of Excitation Transfer between Two-Dimensional Semiconductor and Molecular Layers

et al. 2018

View full text Add to dashboard Cite

The geometry-dependent energy transfer rate from an electrically pumped inorganic semiconductor quantum well into an organic molecular layer is studied theoretically. We focus on Förster-type nonradiative excitation transfer between the organic and inorganic layers and include quasimomentum conservation and intermolecular coupling between the molecules in the organic film. (Transition) partial charges calculated from density-functional theory are used to calculate the coupling elements. The partial charges describe the spatial charge distribution and go beyond the common dipole-dipole interaction. We find that the transfer rates are highly sensitive to variations in the geometry of the hybrid inorganic-organic system. For instance, the transfer efficiency is improved by up to 2 orders of magnitude by tuning the spatial arrangement of the molecules on the surface: Parameters of importance are the molecular packing density along the effective molecular dipole axis and the distance between the molecules and the surface. We also observe that the device performance strongly depends on the orientation of the molecular dipole moments relative to the substrate dipole moments determined by the inorganic crystal structure. Moreover, the operating regime is identified where inscattering dominates over unwanted backscattering from the molecular layer into the substrate.

show abstract

“…Moreover, pronounced nonlinear optical effects could emerge when Wannier excitons from the inorganic semiconductor side mix with the Frenkel excitons typically found in organic materials [5,6]. Due to recent advances in fabrication techniques, the first experimental signatures of nonradiative energy transfer processes between ZnO and conjugated molecules have been observed [7,8]. However, experimentally, it is difficult to determine the precise excitation transfer mechanism, knowledge of which would open up pathways for optimizing the efficiency of future devices.…”

Section: Introductionmentioning

confidence: 99%

Theory of optical excitations in dipole-coupled hybrid molecule-semiconductor layers: Coupling of a molecular resonance to semiconductor continuum states

et al. 2014

View full text Add to dashboard Cite

We theoretically investigate the optical absorption of a hybrid system consisting of an organic molecular film on top of a semiconductor substrate. The electronic states of the isolated spatially separated constituents couple due to the Coulomb interaction of the optically induced charge carriers across the film-substrate interface. Focussing on the coupling of optical active molecular transitions to semiconductor continuum states, we find that the nonradiative dipole-dipole energy transfer causes the formation of coupled excitations, effectively reducing the excitation energy of the optical resonance in the molecular film and inducing a broadening of the associated absorption peak. In the framework of the Heisenberg equation of motion technique, we derive the Bloch equations for these hybrid systems. The input parameters for our model system of ladder-type quarterphenyl (L4P) molecules on the ZnO(1010) surface are taken from density functional theory calculations.

show abstract

Converting Wannier into Frenkel Excitons in an Inorganic/Organic Hybrid Semiconductor Nanostructure

Cited by 124 publications

References 19 publications

Cascade energy transfer versus charge separation in ladder-type oligo(p-phenylene)/ZnO hybrid structures for light-emitting applications

Cascade energy transfer versus charge separation in ladder-type oligo(p-phenylene)/ZnO hybrid structures for light-emitting applications

Theory of Excitation Transfer between Two-Dimensional Semiconductor and Molecular Layers

Theory of optical excitations in dipole-coupled hybrid molecule-semiconductor layers: Coupling of a molecular resonance to semiconductor continuum states

Contact Info

Product

Resources

About