研究目的
To study the phase separation morphology and all-PSC device performance of amorphous polymer acceptors containing B←N unit when blended with three polymer donors with identical polymer backbone but different side chains.
研究成果
The aggregation tendency in solution of polymer donor is the dominant factor in the phase separation of semi-crystalline polymer donor/amorphous polymer acceptor blend in all-PSCs. The polymer donor with the strongest aggregation tendency and moderate crystallinity (J91) showed the most optimal phase separation morphology and the best all-PSC device performance.
研究不足
The study focuses on the effect of polymer donor aggregation on the active layer morphology of amorphous polymer acceptor-based all-PSCs. The limitations include the specific selection of polymer donors and acceptor, which may not cover all possible combinations, and the focus on solution aggregation and crystallinity as the main factors affecting phase separation.
1：Experimental Design and Method Selection:
The study involves selecting three polymer donors with identical polymer backbone but different side chains to blend with an amorphous polymer acceptor (rr-PBN) to investigate their phase separation morphology and all-PSC device performance.
2：Sample Selection and Data Sources:
The three polymer donors, J51, J61, and J91, and the polymer acceptor, rr-PBN, were selected based on their chemical structures and properties.
3：List of Experimental Equipment and Materials:
The study utilized temperature-dependent UV-Vis absorption spectra, 2D-GIWAXS patterns, TEM, AFM, and photovoltaic performance measurements.
4：Experimental Procedures and Operational Workflow:
The aggregation behaviors of the polymer donors in solution were studied, followed by the investigation of their crystallinity in thin film. The phase separation morphology of the blends was characterized, and the photovoltaic performance of the all-PSC devices was evaluated.
5：Data Analysis Methods:
The degree of polymer aggregation in solution was analyzed using UV-Vis absorption spectra. The crystallinity of the polymer donors in thin film was studied using 2D-GIWAXS. The phase separation morphology was characterized using TEM and AFM. The photovoltaic performance was evaluated based on J-V curves and EQE spectra.
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