研究目的
To extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection in the mesoscopic TiO2 film and fast regeneration by the Cu(I) complex in dye-sensitized solar cells (DSSCs) based on Cu(II/I) bipyridyl or phenanthroline complexes as redox shuttles.
研究成果
The study demonstrates that phenanthrene-fused-quinoxaline (PFQ) is a superior auxiliary acceptor compared to benzothiadiazole (BT) for extending the spectral response and improving the performance of DSSCs with copper-based redox shuttles. The HY64 sensitizer achieved a record power conversion efficiency (PCE) of 12.5% with superior stability, highlighting the potential of PFQ-based sensitizers in high-performance DSSCs.
研究不足
The study focuses on the comparison between two specific sensitizers (HY63 and HY64) and their performance in DSSCs with copper-based redox shuttles. The findings may not be directly applicable to other types of sensitizers or redox shuttles. Additionally, the long-term stability and scalability of the devices were not extensively explored.
1：Experimental Design and Method Selection:
The study involved the synthesis and characterization of two new D-A-π-A featured sensitizers, HY63 and HY64, employing benzothiadiazole (BT) and phenanthrene-fused-quinoxaline (PFQ) as auxiliary electron-withdrawing acceptor moieties, respectively. The performance of these sensitizers in DSSCs was evaluated under standard AM1.5G sunlight.
2：5G sunlight.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The dyes were synthesized and characterized using 1H, 13C NMR, and HRMS. Their absorption spectra were studied in CH2Cl2 solution and on mesoporous TiO2 electrodes.
3：List of Experimental Equipment and Materials:
The study utilized cyclic voltammetry for electrochemical measurements, transient photoluminescence (TRPL) spectra for electron injection efficiency estimation, and nanosecond laser flash photolysis for kinetics study of charge-transfer reactions.
4：Experimental Procedures and Operational Workflow:
The DSSCs were fabricated with a double-layer mesoporous TiO2 photoanode, a copper complex [Cu(tmby)2]2+/1+ redox electrolyte, and a PEDOT film on FTO conducting glass as counter electrode. The devices were characterized under AM1.5G simulated solar illumination.
5：5G simulated solar illumination.
Data Analysis Methods:
5. Data Analysis Methods: The data were analyzed using cyclic voltammetry, TRPL, and laser flash photolysis techniques to understand the interfacial charge carrier dynamics and recombination processes.
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