Fig. 3: Effect of tin (IV) iodide on Sn perovskite optical properties, solar cell performance and stability. | Nature Communications

Fig. 3: Effect of tin (IV) iodide on Sn perovskite optical properties, solar cell performance and stability.

From: Degradation mechanism of hybrid tin-based perovskite solar cells and the critical role of tin (IV) iodide

Fig. 3

a UV–Visible spectra of glass/(PEA)0.2(FA)0.8SnI3 thin films made with varying SnI4 concentrations. b Time-resolved PL decays of perovskite films acquired at 875 nm with 404 nm excitation and their fitting curves. Average τf for films are 5.49 ns (film made with purified SnI2; biexponential decay fit), 2.09 ns (film made with control SnI2; biexponential decay fit) and 0.60 ns (film with added SnI4; monoexponential decay fit). c. Current density–voltage (J–V) curves of champion solar cells based on (PEA)0.2(FA)0.8SnI3 made with varying SnI4 concentrations. d. Time evolution of relative absorbance at 660 nm of perovskite thin films made with varying SnI4 concentrations. Degradation experiments were carried out under dark and ambient air conditions (23 °C, 38% RH).

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