Abstract
The search for alternative earth abundant semiconducting nanocrystals for sustainable energy applications has brought forth the need for nanoscale syntheses beyond bulk synthesis routes. Of particular interest are metal phosphides and derivative I–V–VI chalcogenides including copper phosphide (Cu3P) and copper thiophosphate (Cu3PS4). Herein, we report a one-pot, solution-based synthesis of Cu3P nanocrystals utilizing an in situ phosphorus source: phosphorus pentasulfide (P2S5) in trioctylphosphine. By injecting this phosphorus source into a copper solution in oleylamine, uniform and size controlled Cu3P nanocrystals with a phosphorous-rich surface are synthesized. The subsequent reaction of the Cu3P nanocrystals with decomposing thiourea forms nanoscale Cu3PS4 particles having p-type conductivity and an effective optical band gap of 2.36 eV. The synthesized Cu3PS4 produces a cathodic photocurrent during photoelectrochemical measurements, demonstrating its application as a light-absorbing material. Our process creates opportunities to explore other solution-based metal-phosphorus systems and their subsequent sulfurization for earth abundant, alternative energy materials.
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ACKNOWLEDGMENTS
The authors would like to give special thanks to Karl Wood for his mass spectrometry assistance, and James Meyer for his experimental assistance. This work was supported by the National Science Foundation’s Solar Economy IGERT Grant No. 0903670. E.A.S. acknowledges support from the U.S. DOE Office of Science Facility at Brookhaven National Laboratory under Contract No. DE-SC0012704.
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Supplemental Material: An In-situ Phosphorus Source for the Synthesis of Cu3P and the Subsequent Conversion to Cu3PS4 Nanoparticle Clusters (approximately 4.30 MB)
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Sheets, E.J., Yang, WC., Balow, R.B. et al. An in situ phosphorus source for the synthesis of Cu3P and the subsequent conversion to Cu3PS4 nanoparticle clusters. Journal of Materials Research 30, 3710–3716 (2015). https://doi.org/10.1557/jmr.2015.333
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DOI: https://doi.org/10.1557/jmr.2015.333