研究目的
Investigating the effect of symmetric or asymmetric conjugated side chains on the performance of benzodithiophene (BDT)-benzotriazole (BTA) alternated wide bandgap (WBG) copolymers in nonfullerene polymer solar cells.
研究成果
The asymmetric side chain engineering based on siloxane functional groups is a promising design strategy for high-performance polymer donor materials in organic solar cells, achieving a champion power conversion efficiency (PCE) of 14.18% in PBDTFTBA-TSi devices.
研究不足
The study is limited to the specific set of polymers and acceptor (Y6) used. The effect of siloxane functional groups on other polymer systems or with different acceptors was not explored. The thermal stability of polymers with siloxane functional groups was found to be lower than those with alkylthiothienyl groups.
1：Experimental Design and Method Selection:
Three donor copolymers (PDBTFBTA-2T, PBDTFTBA-TSi, PBDTFBTA-2Si) were synthesized with symmetric or asymmetric conjugated side chains. The symmetry effect of the side chains on the properties of these donor polymers was investigated.
2：Sample Selection and Data Sources:
The polymers were characterized using UV-vis absorption spectrometry, cyclic voltammetry (CV), thermogravimetric analysis (TGA), and two-dimensional grazing incidence wide angle X-ray scattering (2D-GIWAXS).
3：List of Experimental Equipment and Materials:
UV-vis absorption spectrometer, CV equipment, TGA, 2D-GIWAXS, atomic force microscopy (AFM), photoinduced force microscopy (PiFM).
4：Experimental Procedures and Operational Workflow:
The polymers were dissolved in common organic solvents and their optical, electrochemical, and thermal properties were measured. The photovoltaic properties were evaluated using PSCs with a conventional device structure.
5：Data Analysis Methods:
The data from UV-vis, CV, TGA, 2D-GIWAXS, AFM, and PiFM were analyzed to understand the effect of side chain symmetry on polymer properties and photovoltaic performance.
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