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Updated: Jun 6, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation
Published on: March 2, 2021
Suppressing Exciton-Vibration Coupling via Intramolecular Noncovalent Interactions for Low-Energy-Loss Organic Solar
Xiaobin Gu1, Yanan Wei1, Rui Zeng2
1College of Materials Science and Opto-Electronic Technology, Center of Materials Science and Optoelectronics Engineering, CAS Center for Excellence in Topological Quantum Computation, and CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing, 101408, China.
Minimizing energy loss in organic solar cells (OSCs) is key to improving efficiency. This study uses intramolecular noncovalent interactions to reduce non-radiative recombination energy loss (ΔEnr), achieving record efficiencies.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic solar cells (OSCs) face efficiency limitations due to energy loss, primarily from non-radiative recombination (ΔEnr) caused by exciton-vibration coupling.
- Tuning molecular interactions is a key strategy to mitigate these losses.
Purpose of the Study:
- To investigate the impact of intramolecular noncovalent interactions on reducing exciton-vibration coupling and energy loss in OSCs.
- To develop novel fused ring electron acceptors (FREAs) for high-efficiency OSCs.
Main Methods:
- Theoretical and experimental analysis of novel fused ring electron acceptors (FREAs).
- Fabrication and characterization of binary and ternary blend OSC devices.
- Measurement of power conversion efficiency (PCE) and non-radiative recombination energy loss (ΔEnr).
Main Results:
- The Y-SeSe based OSC, featuring dual strong intramolecular Se ⋅ ⋅ ⋅ ⋅ O interactions, achieved a PCE of 19.49% with a low ΔEnr of 0.184 eV.
- This represents a new efficiency record for selenium-containing OSCs and the lowest ΔEnr for high-performance binary devices.
- A ternary blend device reached a PCE of 20.51%, demonstrating broad applicability.
Conclusions:
- Intramolecular noncovalent interactions effectively suppress exciton-vibration coupling, leading to reduced energy loss.
- Strategic molecular design of FREAs is crucial for achieving high-efficiency OSCs.
- This work provides a pathway for developing next-generation, low-loss OSCs.
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