研究目的
To overcome photodegradation and achieve long-term operation during photoelectrochemical (PEC) water splitting by demonstrating the influence of high-quality protection layers on Si-Cu2O micropillar arrays created by pulsed laser deposition (PLD).
研究成果
The study successfully developed a highly photostable tandem Si/Cu2O micropillar photocathode with passivating ZnO and TiO2 overlayers using PLD. The optimized device demonstrated a photocurrent of 7.5 mA cm?2 at 0 V vs RHE, a photovoltage of 0.85 V, and stability beyond 75 h, showcasing the effectiveness of PLD for conformal coating on high-aspect ratio micropillar arrays for stable PEC water splitting devices.
研究不足
The study notes that micropillar devices did not show improvement with the Cu2O/CuO heterojunction layer as observed in planar devices, indicating potential limitations in applying certain optimizations across different device architectures.
1：Experimental Design and Method Selection:
The study involved the fabrication of tandem Si/Cu2O micropillar array devices with passivation layers of ZnO and TiO2 deposited by PLD. The influence of geometrical variations to a micropillar array PEC device design on light absorption and onset potential (Voc) was investigated.
2：Sample Selection and Data Sources:
Substrates with vertically ordered micropillar arrays with radial pn-junctions were fabricated using deep-reactive ion etching (DRIE).
3：List of Experimental Equipment and Materials:
Equipment included a magnetron sputtering system for interlayer deposition, PLD for ZnO and TiO2 overlayers, and SEM for characterization.
4：Experimental Procedures and Operational Workflow:
The fabrication process included the deposition of Cu2O on conductive Si/ITO-Au planar and micropillar array substrates by chronoamperometric electrodeposition, followed by thermal annealing to form a Cu2O/CuO heterojunction.
5：Data Analysis Methods:
The performance of the devices was assessed through photoelectrochemical (PEC) measurements, JV characteristics, and stability tests.
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