研究目的
To investigate the effects of alkylsilyl and alkylthio side chains on the performance of fullerene and non-fullerene polymer solar cells by synthesizing two novel high gap donor polymers and analyzing their photophysical, morphological, and photovoltaic properties.
研究成果
The study successfully synthesized two novel high gap donor polymers with alkylsilyl and alkylthio side chains, demonstrating their application in both fullerene and non-fullerene polymer solar cells. The alkylthio-substituted polymer showed superior performance due to its broader and stronger absorption, higher hole mobility, and balanced charge transport, achieving a power conversion efficiency of 9.6% with ITIC as the acceptor. This performance is among the highest for non-fullerene solar cells based on TzBI-containing polymer donors.
研究不足
The study highlights the difficulty in tuning photoactive blends based on alkylsilyl-substituted push monomers to enhance device efficiencies despite inherently increased Voc values. The research suggests exploring terpolymer or ternary blend strategies as alternative options.
1：Experimental Design and Method Selection
The study involved the synthesis of two novel high gap donor polymers, PBDTTSi-TzBI and PBDTTS-TzBI, through Stille cross-coupling polymerization. The polymers were characterized for their thermal, optical, and electrochemical properties. Polymer solar cells were fabricated using both fullerene (PC71BM) and non-fullerene (ITIC) acceptors to study the effect of side chain variation on device performance.
2：Sample Selection and Data Sources
The polymers were synthesized from monomers with asymmetric side chains. The study utilized UV-Vis-NIR absorption spectroscopy, cyclic voltammetry, atomic force microscopy, transmission electron microscopy, and space charge limited current measurements for characterization.
3：List of Experimental Equipment and Materials
High-temperature gel permeation chromatography for molar mass determination, thermogravimetric analysis for thermal stability, UV-Vis-NIR spectrophotometer for absorption spectra, atomic force microscope and transmission electron microscope for morphology studies, and solar simulators for photovoltaic performance evaluation.
4：Experimental Procedures and Operational Workflow
The polymers were synthesized, purified, and characterized. Solar cells were fabricated in both inverted and conventional architectures. Device performance was optimized by varying donor to acceptor weight ratio, processing solvent, additive, thermal annealing temperature, and active layer thickness.
5：Data Analysis Methods
Data from UV-Vis-NIR spectroscopy, cyclic voltammetry, and photovoltaic measurements were analyzed to determine optical properties, energy levels, and device performance parameters. Morphological studies were conducted to understand the blend morphology.
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