研究目的
To study the thin film properties of the new hexachloro-pyrazinosubporphyrazine compound, Cl6-pSubPz, in comparison with those of an effective molecular acceptor, hexachloro-substituted subphthalocyanine, Cl6-SubPc, for photovoltaic applications.
研究成果
The morphology, optical and conductive properties of the thin sublimed film of Cl6-pSubPz are described with a view of prospective application in organic photovoltaic devices and compared with those of Cl6-SubPc. Despite structural similarity, their optical and thin-film properties are dissimilar. Cl6-pSubPz shows pronounced ordering of molecules in thin sublimed films, while Cl6-SubPc forms predominantly amorphous films unless special procedures are applied.
研究不足
The study is limited to the characterization of thin films of Cl6-pSubPz and Cl6-SubPc under specific conditions. The actual transport gap in the excitonic molecular semiconductors and the effect of film morphology on transport and charge carrier recombination mechanisms require further evaluation.
1：Experimental Design and Method Selection:
The study involved the synthesis, purification, and characterization of Cl6-pSubPz and Cl6-SubPc, followed by the deposition of thin films via high-vacuum sublimation.
2：Sample Selection and Data Sources:
Different substrates such as optical sapphire, monocrystalline silicon Si(1 1 1) covered with native oxide, zinc selenide ZnSe, glass/ITO, and ceramic plates with interdigitated Ni electrodes were used.
3：List of Experimental Equipment and Materials:
A VUP-5 M thermal evaporator for sublimation, TalySurf CCI2000 non-contact profilometer for surface morphology analysis, Bruker D8 Discover for XRD patterns, FireFly4000 spectrometer for electronic absorption spectra, and Keithley 4200-SCS system for photoelectrical measurements.
4：Experimental Procedures and Operational Workflow:
The sublimation temperature and deposition surface temperature were monitored, with a mean deposition rate of
5：1–2 nm/s. Data Analysis Methods:
The surface morphology was analyzed, XRD patterns were obtained, electronic absorption spectra were recorded, and photoelectrical measurements were carried out.
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