研究目的
Investigating the properties and applications of cyclooctatetrathiophene-cored hole transport materials (HTMs) in perovskite solar cells (PSCs) to achieve high power conversion efficiency (PCE).
研究成果
COTT-1 and COTT-2 exhibit high thermal and electrochemical stability. COTT-2, with methoxy groups, shows enhanced solubility and stronger electron-donating ability, leading to a PCE of 17.7%. Using COTT-1 as an interfacial layer improves the performance of COTT-2-based PSCs to over 19% efficiency, demonstrating the potential of cyclooctatetrathiophene-based HTMs in high-efficiency PSCs.
研究不足
The solubility of COTT-1 in chlorobenzene is poor, affecting film formation and device performance. The HOMO energy level of COTT-2 is deeper than that of Spiro-OMeTAD, leading to energy loss and lower PCE.
1：Experimental Design and Method Selection:
Synthesis of COTT-1 and COTT-2, characterization of their photophysical, electrochemical, and thermal properties, and application in PSCs.
2：Sample Selection and Data Sources:
Perovskite films and HTMs were prepared and characterized using various techniques.
3：List of Experimental Equipment and Materials:
Fluorine-doped tin oxide (FTO), TiO2, PCBM, perovskite, HTMs (COTT-1, COTT-2, Spiro-OMeTAD), gold electrodes.
4：Experimental Procedures and Operational Workflow:
Fabrication of PSCs with architecture FTO/TiO2/PCBM/perovskite/HTM/Au, including spin-coating, sintering, and thermal evaporation.
5：Data Analysis Methods:
UV-vis absorption, cyclic voltammetry (CV), thermal gravimetric analysis (TGA), SEM, AFM, PL, TRPL, IPCE, and J-V measurements.
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