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Dual-source evaporation of silver bismuth iodide films for planar junction solar cells

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Abstract

Non-toxic and air-stable silver bismuth iodide semiconductors are promising light absorber candidates for photovoltaic applications owing to a suitable band gap for multi- or single-junction solar cells. Recently, solution-based film fabrication approaches for several silver bismuth iodide stoichiometries have been investigated. The current work reports on a facile and reproducible two-step coevaporation/annealing approach to deposit compact and pinhole-free films of AgBi2I7, AgBiI4 and Ag2BiI5. X-ray diffraction (XRD) in combination with scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX) analysis reveals formation of pure cubic (Fd[3 with combining macron]m) phase AgBi2I7, cubic (Fd[3 with combining macron]m) or rhombohedra (R[3 with combining macron]m) phase AgBiI4, each with >3 μm average grain size, or the rhombohedral phase (R[3 with combining macron]m) Ag2BiI5 with >200 nm average grain size. A phase transition from rhombohedral to cubic structure is investigated via temperature-dependent X-ray diffraction (TD-XRD). Planar-junction photovoltaic (PV) devices are prepared based on the coevaporated rhombohedral AgBiI4 films, with titanium dioxide (TiO2) and poly(3-hexylthiophene) (P3HT) as electron- and hole-transport layers, respectively. The best-performing device exhibited a power conversion efficiency (PCE) of as high as 0.9% with open-circuit voltage (VOC) > 0.8 V in the reverse scan direction (with significant hysteresis).

Graphical abstract: Dual-source evaporation of silver bismuth iodide films for planar junction solar cells

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Publication details

The article was received on 06 Sep 2018, accepted on 27 Dec 2018 and first published on 28 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA08679F
Citation: J. Mater. Chem. A, 2019, Advance Article
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    Dual-source evaporation of silver bismuth iodide films for planar junction solar cells

    M. Khazaee, K. Sardashti, C. Chung, J. Sun, H. Zhou, E. Bergmann, W. A. Dunlap-Shohl, Q. Han, I. G. Hill, Jacob L. Jones, D. C. Lupascu and D. B. Mitzi, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA08679F

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