Chemistry of Inorganic Materials (Aug 2024)

Accelerated formation of photoactive formamidinium-based lead triiodide perovskite crystals by the addition of copper iodide

  • Riku Okumura,
  • Takeo Oku,
  • Atsushi Suzuki

Journal volume & issue
Vol. 3
p. 100052

Abstract

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Additions of copper iodide (CuI), rubidium iodide, or cesium iodide to perovskite precursor solutions accelerated the formation of the photoactive α-phase of formamidinium lead triiodide (FAPbI3) perovskite crystals. In particular, the addition of CuI suppresses the formation of low-dimensional perovskite phases, thereby reducing carrier transport. The first-principles calculations revealed that substituting Cu at the formamidinium site could maintain the effective mass ratios of the α-phase. The CuI addition to FAPbI3 is expected to enhance its photovoltaic properties. Moreover, introducing CuI into perovskite precursor solutions is suggested as a new approach to accelerate the formation of the photoactive α-FAPbI3 phase.