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Updated: Feb 1, 2026
09:19
In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for CuIn,GaSe2 Solar Cells
Published on: October 3, 2018
8.8K
Isomery-Dependent Miscibility Enables High-Performance All-Small-Molecule Solar Cells.
Hao Wu1,2, Haijun Fan1, Shengjie Xu1
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Small (Weinheim an Der Bergstrasse, Germany)
|December 4, 2018
Summary
Designing isomeric small-molecule acceptors with controlled interfacial tension significantly boosts nonfullerene small-molecule solar cell performance. This molecular design strategy is key for efficient phase separation and optimal blend morphology, leading to high power conversion efficiencies.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Nonfullerene polymer solar cells have advanced rapidly.
- Nonfullerene small-molecule solar cells (NF-SMSCs) lag due to limited structure-performance understanding.
Purpose of the Study:
- Design and synthesize isomeric small-molecule acceptors to explore structure-performance relationships in NF-SMSCs.
- Investigate the impact of molecular structure on photovoltaic performance and blend morphology.
Main Methods:
- Synthesized two isomeric small-molecule acceptors (NBDTP-Fout and NBDTP-Fin) based on the benzodi(thienopyran) (BDTP) core.
- Fabricated NF-SMSCs using an eco-friendly solvent (tetrahydrofuran) and blended with a molecular donor (BDT3TR-SF).
- Conducted detailed investigations on optoelectronic properties and morphological evolution.
Main Results:
- The BDT3TR-SF:NBDTP-Fout blend achieved a high power conversion efficiency of 11.2%.
- The isomeric BDT3TR-SF:NBDTP-Fin blend showed negligible photovoltaic response (0.02%).
- Performance disparity was linked to interfacial tension, affecting phase separation and blend morphology.
Conclusions:
- Proper interfacial tension, modulated by molecular "isomerization" design, is crucial for efficient phase separation and optimal morphology in NF-SMSCs.
- This study provides a general guideline for designing high-performance NF-SMSCs through interfacial-tension-oriented molecular design.
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