Related Experiment Video
Updated: Jul 9, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Topological control of singlet fission
Kipper Riemersma1, Krishna Gautam1, Antonio Fuentes Solis1
1Department of Chemistry, University of Nevada, Reno, Reno, Nevada 89557, USA.
The Journal of Chemical Physics
|July 8, 2026
Summary
Singlet fission, a process boosting solar cell efficiency, can now be optimized using a new topological framework. This method, applied to DNA-scaffolded networks, reveals lattice structures like Kagomé can double singlet fission efficiency.
Area of Science:
- Materials Science
- Quantum Information Science
- Nanotechnology
Background:
- Singlet fission (SF) is a multiple-exciton-generation process crucial for enhancing photovoltaic efficiencies and advancing quantum information processing.
- Traditional SF materials (acenes, rylenes, carotenoids) are limited by strict requirements for energy-level alignment and aggregate structure.
- DNA-scaffolded molecular networks offer a novel approach to decouple these constraints by modular chromophore selection and DNA origami-based structural control.
Purpose of the Study:
- To develop a theoretical framework for optimizing singlet fission in programmable molecular networks.
- To investigate the impact of lattice structure on singlet fission efficiency using DNA nanotechnology.
- To identify key structural features that enhance the singlet fission process.
Main Methods:
- Introduction of a topological framework based on simplicial complexes and Hodge theory to model singlet fission as a vertex-to-edge conversion.
- Application of the framework to five lattice structures (linear, square, honeycomb, Kagomé, Lieb) using parameters for pentacene, diketopyrrolopyrrole, and perylene diimide.
- Analysis of lattice-dependent efficiency enhancements, focusing on multi-channel pathways, edge/vertex ratios, and exciton localization.
Main Results:
- The lattice structure significantly multiplies singlet fission efficiency.
- The Kagomé lattice demonstrated an approximate 2× enhancement in singlet fission efficiency compared to other lattices.
- Key advantages of the Kagomé lattice include triangular 2-simplices, a high edge/vertex ratio, and flatband exciton localization.
Conclusions:
- The developed topological framework provides a new perspective on controlling singlet fission through collective network arrangements.
- DNA-scaffolded chromophore networks offer a powerful platform for realizing enhanced singlet fission.
- The findings are experimentally verifiable through 2D electronic spectroscopy, paving the way for optimized molecular devices.
Related Concept Videos
02:50Nuclear Fission
Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
01:25Deactivation Processes: Jablonski Diagram
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
01:12Fermi Level Dynamics
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
01:18Singularity Functions for Bending Moment
Singularity functions simplify the representation of bending moments in beams subjected to discontinuous loading, allowing the use of a single mathematical expression. For a supported beam AB, with uniform loading from its midpoint M to the right side end B, the approach involves conceptual 'cuts' at specific points to determine the bending moment in each segment. By cutting the beam at a point between A and M, the bending moment for the segment before reaching midpoint M is represented using a...
01:03Atomic Nuclei: Nuclear Spin State Overview
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...