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An in situ phosphorus source for the synthesis of Cu3P and the subsequent conversion to Cu3PS4 nanoparticle clusters

  • Erik J. Sheets (a1), Wei-Chang Yang (a2), Robert B. Balow (a3), Yunjie Wang (a4), Bryce C. Walker (a4), Eric A. Stach (a5) and Rakesh Agrawal (a6)...

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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a) Address all correspondence to this author. e-mail: agrawalr@purdue.edu

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An in situ phosphorus source for the synthesis of Cu3P and the subsequent conversion to Cu3PS4 nanoparticle clusters

  • Erik J. Sheets (a1), Wei-Chang Yang (a2), Robert B. Balow (a3), Yunjie Wang (a4), Bryce C. Walker (a4), Eric A. Stach (a5) and Rakesh Agrawal (a6)...

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