研究目的
Investigating the enhancement of efficiency and photostability in organic solar cells through the introduction of a fullerene additive into a non-fullerene acceptor-based bulk heterojunction system.
研究成果
The integration of PC71BM as a guest molecule into the PTB7-Th:IEICO-4F host blend successfully enhances both the efficiency and photostability of organic solar cells. The optimized ternary blend achieves a high PCE of 10.55% and retains approximately 80% of its initial PCE after 500 h of continuous illumination. The study provides valuable insights into the design of ternary blends for improved performance and stability in OSCs.
研究不足
The study focuses on the specific combination of PTB7-Th, IEICO-4F, and PC71BM. The generalizability of the findings to other material systems may require further investigation. Additionally, the long-term stability under various environmental conditions beyond continuous illumination was not explored.
1：Experimental Design and Method Selection
The study involves the fabrication of ternary organic solar cells (OSCs) by integrating PC71BM as a guest molecule into the PTB7-Th:IEICO-4F host blend. The methodology includes the optimization of the blend ratio between IEICO-4F and PC71BM to achieve enhanced performance and stability.
2：Sample Selection and Data Sources
The materials used include PTB7-Th, IEICO-4F, and PC71BM. The devices were fabricated with the configuration of ITO/ZnO/active layer/MoO3/Ag. The active layers were deposited from chlorobenzene solution by spin-coating.
3：List of Experimental Equipment and Materials
Equipment includes a solar simulator (Newport Oriel), a Keithley 236 source measure unit, a solar cell spectral response/QE/EQE measurement system (PV Measurements, Inc.), a contact angle analyzer (Phoenix 300, SEO Co., Ltd.), a UV–visible–NIR spectrometer (Perkin Elmer Lambda 750), an atomic force microscope (XE-100, Park systems, Inc.), a STEM (Tecnai G2 F30 S-Twin microscope), and a UPS (Sigma Probe, Thermo VG Scientific). Materials include PTB7-Th, IEICO-4F, and PC71BM.
4：Experimental Procedures and Operational Workflow
The ZnO precursor solution was spin-coated on UV-Ozone treated glass/ITO substrates and annealed. The active layers were deposited by spin-coating from chlorobenzene solution. Finally, MoO3 and Ag were deposited by thermal evaporation to complete the device fabrication.
5：Data Analysis Methods
The J-V characteristics were measured under AM 1.5G illumination. The EQE data were obtained using a solar cell spectral response system. The contact angles, UV-visible absorption profiles, surface topography, and molecular packing were analyzed using respective equipment. The charge carrier mobilities were estimated using the Mott-Gurney equation.
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