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Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting.

ABSTRACT: The fabrication of semiconductor films on conductive substrates is vital to the production of high-performance electrodes for photoelectrochemical (PEC) water splitting. In this work, a thin film transfer method was developed to produce Ta3N5 film photoanodes for PEC water oxidation. Phase-pure Ta3N5 thin films were formed on inert Si substrates via magnetron sputtering of Ta films, followed by oxidation and subsequent nitridation in a flow of gaseous NH3. The resulting porous Ta3N5 films were uniformly transferred from the Si substrates using metallic layers that allowed ohmic contact at the Ta3N5 film/metal interface. This film transfer method enables control over the film thicknesses and layered structures of the Ta3N5 photoanodes. Following modification with a Co(OH) x layer acting as an oxygen-evolution catalyst, a Ta3N5 photoanode with a NbN x interlayer exhibited a photocurrent of 3.5 mA cm-2 at 1.23 V vs. RHE under a simulated AM 1.5G light, a value 1.7 times that generated by a photoanode without interlayers. The present film transfer method is potentially applicable to the development of semiconductor thin films for efficient PEC energy conversion.

SUBMITTER: Wang C

PROVIDER: S-EPMC6021777 | biostudies-other | 2016 Sep

REPOSITORIES: biostudies-other

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Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting.

Wang Chizhong C Hisatomi Takashi T Minegishi Tsutomu T Nakabayashi Mamiko M Shibata Naoya N Katayama Masao M Domen Kazunari K

Chemical science 20160525 9

The fabrication of semiconductor films on conductive substrates is vital to the production of high-performance electrodes for photoelectrochemical (PEC) water splitting. In this work, a thin film transfer method was developed to produce Ta3N5 film photoanodes for PEC water oxidation. Phase-pure Ta3N5 thin films were formed on inert Si substrates via magnetron sputtering of Ta films, followed by oxidation and subsequent nitridation in a flow of g ...[more]

PMID: 30034721

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Project description:In this research article, an organic polymer based polypyrrole (Ppy) composite material has been synthesized and analyzed for the design and fabrication purposes of a fast-responsive, highly sensitive, and an economical resistive-type novel humidity detection sensor. This humidity sensor most suitably serves the purpose for industrial humidity (i.e., values ranging from low to high) detection applications. First, a polypyrrole composite material (a mixture of polypyrrole, polypyrrole-NiO, polypyrrole-CeO2, and polypyrrole-Nb2O5) has been synthesized by chemical oxidative polymerization method, and then is treated at various temperatures, i.e., 100, 150 and 200 °C, respectively. After this treatment, the synthesized samples were then characterized by using FTIR, SEM, and DTA/TGA techniques for analyzing humidity sensing properties. The polypyrrole samples with the best morphological structure and properties were then incorporated on interdigitated electrodes. For the fabrication purposes of this thin film structure, at first a few drops of polyvinyl alcohol (PVA) were placed over interdigitated electrodes (IDE) and then the synthesized polypyrrole composite was uniformly deposited in the form of a thin film over it. The plots show that this is a good resistive-type humidity detection device for the relative humidity range of 30% to 90%. The response and recovery times of this newly fabricated humidity sensor were reported to be the same as 128 s at room temperature. Additionally, the stability and the repeatability response behavior of this Ppy sensor were verified up to five cycles of multiple repetitions. This presents an excellent stability and repeatability performance of the sensor. Furthermore, the capacitances versus humidity response and recovery properties of the designed sensor were studied too. This illustrates an excellent capacitive verses humidity response and shows a linear and an active behavior. Lastly, the experimental result proves that polypyrrole composite thin film shows a reasonable best performance up to a temperature of 100 °C.

Dataset Information

Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting.

Publications

Thin film transfer for the fabrication of tantalum nitride photoelectrodes with controllable layered structures for water splitting.

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