研究目的
Investigating the field effect in PbSnTe:In epitaxial films with low conductivity in the mode of the space-charge limited current and the effect of the surface state of the SCLC features.
研究成果
The experimental results indicate a strong effect of the surface state of semi-insulating PbSnTe:In films on injection space-charge limited currents. The observed field effect and influence of chemical surface treatment on the SCLC value qualitatively correspond to a model that assumes a substantial contribution of surface localized states to the total localized charge formed due to injection from contacts.
研究不足
The study is limited by the specific conditions under which the experiments were conducted, including the temperature (T = 4.2 K) and the materials used (PbSnTe:In films on BaF2 substrates). The model proposed is qualitative and requires further quantitative validation.
1：Experimental Design and Method Selection:
The study involved measuring the space-charge-limited current (SCLC) in PbSnTe:In films under varying conditions, including the application of a transverse electric field and surface treatments.
2：Sample Selection and Data Sources:
Samples were based on PbSnTe:In films grown by molecular-beam epitaxy on BaF2(111) substrates, selected for their low conductivity and high mobility.
3：List of Experimental Equipment and Materials:
Structures with indium film contacts, fluoroplastic film as a dielectric, and a high-voltage source for applying transverse electric fields.
4：Experimental Procedures and Operational Workflow:
Measurements were conducted at T =
5：2 K, with the application of transverse electric fields and surface treatments to observe changes in SCLC. Data Analysis Methods:
The behavior of the I–V characteristics was analyzed to understand the effect of surface states and transverse electric fields on SCLC.
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