Related Experiment Video
Updated: Dec 5, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Long-range exciton diffusion in molecular non-fullerene acceptors
Yuliar Firdaus1, Vincent M Le Corre2, Safakath Karuthedath1
1King Abdullah University of Science and Technology (KAUST), KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), Material Science and Engineering Program (MSE), 23955-6900, Thuwal, Kingdom of Saudi Arabia.
Researchers identified nonfullerene acceptors with long exciton diffusion lengths (20-47 nm) for efficient organic photovoltaics. These materials advance understanding and enable higher solar cell performance.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Electronics
Background:
- Classical organic semiconductors in organic photovoltaics have short exciton diffusion lengths (5-20 nm).
- This limits the domain size in photoactive layers, hindering solar cell efficiency.
Purpose of the Study:
- To measure exciton diffusion lengths in various nonfullerene acceptor molecules.
- To identify materials capable of longer exciton transport for improved organic solar cell efficiency.
Main Methods:
- Utilized photocurrent and ultrafast spectroscopy measurements to determine exciton diffusion lengths.
- Employed quantum-chemical calculations to analyze exciton dynamics and establish design principles.
Main Results:
- Nonfullerene acceptors demonstrated balanced ambipolar charge transport.
- Exciton diffusion lengths were found to be significantly longer, ranging from 20 to 47 nm.
- Quantum-chemical calculations provided insights into exciton dynamics and chemical design rules.
Conclusions:
- Nonfullerene acceptors offer a promising pathway to overcome limitations of classical organic semiconductors.
- End-group substituents play a crucial role in crystal packing, influencing exciton diffusion.
- These findings pave the way for designing more efficient organic photovoltaic devices.
More Related Videos
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
08:44Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
Published on: August 22, 2017
Related Concept Videos
¹H NMR: Long-Range Coupling
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
Molecular Spectroscopy: Absorption and Emission
IR Absorption Frequency: Delocalization
In IR...
UV–Vis Spectroscopy: Molecular Electronic Transitions
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Protein Diffusion in the Membrane