研究目的
To investigate the potential of 5H-fluoreno[3,2-b:6,7-b’]dithiophene based non-fullerene small molecular acceptors for polymer solar cell applications.
研究成果
The research demonstrates that 5H-fluoreno[3,2-b:6,7-b’]dithiophene based non-fullerene small molecular acceptors, particularly DICTFDT, can serve as excellent candidates for efficient polymer solar cells. The closer π-π stacking and better ordering of DICTFDT in solid state contribute to its higher performance compared to TFDTBR. With further molecular engineering and choice of compatible polymer donors, these acceptors could lead to even higher efficiencies.
研究不足
The study is limited to the evaluation of two specific non-fullerene acceptors and their performance with one polymer donor, PTB7-Th. The efficiency of the solar cells, while promising, is not yet competitive with the highest efficiencies reported for polymer solar cells.
1：Experimental Design and Method Selection:
The study involved the synthesis of two novel non-fullerene small molecule acceptors, DICTFDT and TFDTBR, using 5H-fluoreno[3,2-b:6,7-b’]dithiophene as the conjugated backbone. The optoelectronic properties and photovoltaic performance of these acceptors were evaluated.
2：Sample Selection and Data Sources:
The acceptors were synthesized and characterized for their thermal stability, absorption spectra, and electrochemical properties. Polymer solar cells were fabricated using these acceptors with PTB7-Th as the polymer donor.
3：List of Experimental Equipment and Materials:
Chemicals were purchased from J&K, Energy Chemical, Sinopharm Chemical Reagent Co. Ltd., etc. THF and toluene were distilled before use. General experimental information on chemical structure characterization, measurements of thermal stability, light absorption, and electrochemical properties were referenced from previous publications.
4：Experimental Procedures and Operational Workflow:
The synthesis involved multiple steps including bromination, coupling reactions, and purification by column chromatography. The photovoltaic devices were fabricated in the configuration of glass/ITO/ZnO/PTB7-Th: acceptor/MoO3/Ag.
5：Data Analysis Methods:
The performance of the solar cells was evaluated through current density-voltage (J-V) curves and external quantum efficiency (EQE) spectra. Charge carrier mobilities were determined by space charge limited current (SCLC) method.
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THF
Solvent used in the synthesis process
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toluene
Solvent used in the synthesis process
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chloroform
Solvent used in the synthesis process
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o-dichlorobenzene
Solvent used for UV-Vis absorption spectra measurements
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PTB7-Th
Polymer donor used in the fabrication of polymer solar cells
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ITO
Conductive transparent electrode used in the solar cell device
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ZnO
Electron transport layer in the solar cell device
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MoO3
Hole transport layer in the solar cell device
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Ag
Top electrode in the solar cell device
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