研究目的
To demonstrate the use of ethylene vinyl acetate (EVA), a non-conjugated insulating polymer, to disperse multi- and single-walled CNTs (MWCNT and SWCNT) in organic solvents for producing semitransparent conductive films and as selective hole contacts in perovskite solar cells.
研究成果
The inexpensive, insulating EVA polymer can effectively solubilize and bind to CNTs, producing stable dispersions and high-quality conductive films. These films show good electronic properties and can be used as selective contacts in perovskite solar cells, achieving high power conversion efficiencies. This work challenges the necessity of using conjugated polymers for CNT functionalization in electronic devices.
研究不足
The study demonstrates the potential of EVA/CNT composites for electronic applications, but the scalability and long-term stability of these materials in solar cells need further investigation. The process may require optimization for large-scale production.
1：Experimental Design and Method Selection:
The study involved the solubilization of CNTs using EVA in organic solvents, followed by the deposition of thin films via spray coating. The electrical and optical properties of the films were studied, and their application in perovskite solar cells was demonstrated.
2：Sample Selection and Data Sources:
SWCNTs produced by the HiPCO method and MWCNTs from Nanocyl were used. The films were deposited on glass substrates and characterized using various techniques.
3：List of Experimental Equipment and Materials:
EVA pellets, chlorobenzene, toluene, chloroform, ultrasonic probe, centrifuge, spray coater, AFM, spectrophotometer, solar simulator, sourcemeter.
4：Experimental Procedures and Operational Workflow:
The CNTs were functionalized with EVA, dispersed in solvents, and deposited as films. The films were characterized for their conductivity and transparency. Perovskite solar cells were fabricated using these films as hole-transporting layers.
5：Data Analysis Methods:
The conductivity of the films was measured using a four-point probe method. The optical properties were studied using UV-vis-NIR spectrophotometry. The performance of the solar cells was evaluated using a solar simulator and sourcemeter.
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