研究目的
Investigating the impact of electrode choice upon the extraction of shift current from a representative ferroelectric semiconductor SbSI and verifying the dissipation-less nature of shift current.
研究成果
The study demonstrates that the output of shift current strongly depends on the work function of the electrode materials. For a p-type ferroelectric semiconductor SbSI, large-work-function electrodes are superior to efficiently extract the shift current. The dissipation-less nature of shift current was verified, showing it is not affected by the scattering of carriers. The findings provide a guideline for designing optimum device structures for energy-harvesting and photo-detecting devices based on the shift current mechanism.
研究不足
The study is limited to the ferroelectric semiconductor SbSI and the impact of electrode materials on the extraction of shift current. The findings may not be directly applicable to other materials or systems.
1：Experimental Design and Method Selection:
The study focuses on the photovoltaic effect in noncentrosymmetric bulk crystals, specifically SbSI, under various electrode materials. The methodology involves measuring photocurrent and photovoltage under illumination with light from a solar simulator.
2：Sample Selection and Data Sources:
Needle-like single crystals of SbSI were grown by physical vapor transport technique. Various electrode materials (Pt, Au, Ag, Al, Al/Ca, Al/LiF) were deposited on the crystals to test the dependence of the photovoltaic effect on electrode material type.
3：List of Experimental Equipment and Materials:
Solar simulator (0.1 W cm?2), various electrode materials (Pt, Au, Ag, Al, Al/Ca, Al/LiF), SbSI single crystals.
4：1 W cm?2), various electrode materials (Pt, Au, Ag, Al, Al/Ca, Al/LiF), SbSI single crystals.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Measurements of photocurrent and photovoltage were carried out under illumination. The gap between both electrodes was defined to be 0.45 mm using a stencil mask.
5：45 mm using a stencil mask.
Data Analysis Methods:
5. Data Analysis Methods: The temperature dependence of zero-bias photocurrent and open-circuit photovoltage (VOC) was analyzed. The relationship between the magnitude of zero-bias photocurrent and the work function of contact metals was examined.
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