研究目的
To evaluate the relationship between conjugated side group and crystalline behavior in the ternary system of polymer solar cells (PSCs) and to determine how the length of the side group affects the device performance.
研究成果
The study demonstrated that the length of the conjugated side group on the donor backbone significantly affects the crystalline behavior and device performance in ternary PSCs. The P1 ternary system, with a phenyl side group, showed improved performance due to enhanced crystallinity and charge transport, while the P2 ternary system, with a biphenyl side group, exhibited poor performance due to disturbed molecular stacking. The findings highlight the importance of selecting polymers with appropriate conjugated side groups for high-performance ternary PSCs.
研究不足
The study is limited to the specific polymers and acceptors used, and the findings may not be generalizable to all ternary systems. The impact of other structural variations on the performance of ternary PSCs was not explored.
1：Experimental Design and Method Selection:
Two polymers with different lengths of side groups (P1 with phenyl side group and P2 with biphenyl side group) were adopted in dual-acceptor ternary systems. The study focused on the relationship between the conjugated side group and crystalline behavior in the ternary system.
2：Sample Selection and Data Sources:
The study used P1 and P2 as donors, and LA1 and NCBDT-4Cl as acceptors to construct ternary PSCs. The photovoltaic performance was evaluated through a series of binary and ternary devices.
3：List of Experimental Equipment and Materials:
The devices were fabricated with the structure of ITO/PEDOT:PSS/Donor:Acceptors/PDINO/Al. Characterization techniques included TEM, AFM, 2D-GIXD, and PL quenching.
4：Experimental Procedures and Operational Workflow:
The study involved fabricating binary and ternary devices, measuring their photovoltaic performance, and analyzing the morphology and crystallinity of the blend films.
5：Data Analysis Methods:
The data were analyzed to understand the impact of the side group length on the device performance, focusing on photoresponse, charge transport, and molecular stacking.
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