研究目的
Investigating the use of pulsed laser deposition (PLD) of PbS nanoparticles on porous silicon layers to passivate multicrystalline silicon (mc-Si) substrates for solar cells applications.
研究成果
The PLD technique successfully decorated porous silicon layers with PbS nanoparticles, improving passivation properties for solar cells. An optimal decoration at NLP = 200 was identified, leading to the lowest surface reflectivity, highest PL intensity, and longest minority carrier lifetime. This improvement is attributed to a good fit between the PbS-NPs and the pores of the PS layer, reducing dangling bonds and charge trapping centers.
研究不足
The study is limited by the sensitivity of XRD for tiny amounts of PbS below NLP = 800 pulses and the broad size distribution of PbS-NPs. The drop of PL intensity at NLP = 400 lacks a plausible explanation.
1：Experimental Design and Method Selection:
The porous silicon (PS) layer was formed by electrochemically anodizing p-type mc-Si wafers. The PLD technique was used to decorate the PS layer with PbS-NPs at room temperature by varying the number of laser ablation pulses (NLP) from 50 to
2：Sample Selection and Data Sources:
12 p-type mc-Si wafers (330 μm-thick and a resistivity of 0.5-2 ohm.cm) were used. The PbS-NPs were deposited from the ablation of a 2"-diameter PbS target using a pulsed KrF excimer laser.
3：5-2 ohm.cm) were used. The PbS-NPs were deposited from the ablation of a 2"-diameter PbS target using a pulsed KrF excimer laser.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A Philips X’pert-MPD X-ray diffractometer, FEI Tecnai G2 microscope, PerkinElmer Lambda 950 spectrophotometer, WCT-120 Silicon Wafer Lifetime Tester, and Fluorolog-3 system were used for characterization.
4：Experimental Procedures and Operational Workflow:
The PS/mc-Si substrates were decorated by PbS-NPs using PLD. The crystalline structure and nanomorphology were characterized by XRD and TEM. The passivation effects were assessed by measuring optical reflectivity, photoluminescence, and minority carrier lifetime.
5：Data Analysis Methods:
The effective lifetime of the minority charge carriers was calculated using a specific relation to assess the passivation efficiency.
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