研究目的
To elucidate the complex materials distribution in the active layers of ternary organic solar cells and understand the photophysical processes to improve device performance.
研究成果
The study successfully elucidated the nanomorphology of a ternary organic solar cell using multimodal analytical transmission electron microscopy, revealing the material distribution of all three organic components. This understanding is crucial for improving the device performance of organic photovoltaics.
研究不足
The study focuses on a specific ternary organic solar cell system, and the findings may not be directly applicable to other systems. The complexity of the nanomorphology may also limit the generalizability of the results.
1：Experimental Design and Method Selection
The study utilized analytical transmission electron microscopy (TEM) to visualize the material distribution of all three organic components in the active layer of ternary organic solar cells. Multimodal imaging using complementary electron energy loss signals was employed.
2：Sample Selection and Data Sources
The active layers consisted of PIDTTQ:Si-PCPDTBT:PC70BM with varying mixing ratios. Samples were prepared by doctor-blading under ambient conditions.
3：List of Experimental Equipment and Materials
FEI Titan Themis3 300 TEM equipped with a high-brightness field-emission gun (X-FEG), Gatan Imaging Filter (GIF Quantum), four-quadrant silicon drift detector (SDD) system (Super-X detector), FEI Helios NanoLab 660 SEM/FIB dualbeam system.
4：Experimental Procedures and Operational Workflow
Plan-view specimens were prepared by floating off the active layer onto a lacey carbon film TEM supporting grid. Cross-section samples were prepared using the in situ lift-out technique in a SEM/FIB dualbeam system.
5：Data Analysis Methods
Energy-filtered TEM (EFTEM), electron energy-loss spectroscopy (EELS), and energy-dispersive X-ray spectroscopy (EDXS) were used for material discrimination and spatial mapping.
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