Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.224
Publication date: 22nd December 2022
A tandem photoelectrochemical (PEC) water-splitting device for solar hydrogen production consists of two light absorbers with different bandgaps. It is important to enhance the performance of both cells to achieve high solar-to-hydrogen (STH) conversion efficiency. In this regard, silicon photoelectrodes have been widely investigated because of their bandgap (1.12 eV), which is suitable for the low bandgap bottom cell of a tandem device. Herein, we apply a tunnel oxide passivated contact (TOPCon) on the front and back sides of a Si wafer to prepare a TOPCon Si PEC device. Photocathodes and photoanodes based on TOPCon Si are demonstrated over a broad pH range (0–14), and they produce photovoltages of 640–650 mV under 1 sun illumination, which are the highest values obtained from crystalline Si photoelectrodes. TOPCon Si demonstrates excellent thermal stability, enduring a high processing temperature of up to 600 °C for 1 h in air. These advantages of TOPCon Si provide high efficiency and great design flexibility for monolithic tandem cells. TOPCon Si was coupled with BiVO4, a large bandgap top cell consisting of earth-abundant and non-toxic elements, in monolithic construction, i.e., a wireless PEC tandem cell. A photovoltage exceeding 1.7 V was produced by the BiVO4/Si with a successful demonstration of unbiased PEC water splitting. I will discuss details of the challenges and our solutions in the monolithic integration of BiVO4 and Si.
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