Dopant compensation in component-dependent self-doped Cs2SnI6 thin films grown with PLD at room temperature

doi:10.1016/j.jmst.2024.08.011

Abstract

Abstract: Tetravalent tin (Sn⁴⁺)-based inorganic perovskite semiconductors like Cs₂SnI₆ are expected to replace lead-based perovskite counterparts due to advantages such as structural stability and environmental friendliness. In this paper, we reported the dopant compensation effect in the component-dependent self-doped (111)-oriented Cs₂SnI₆ thin films grown with pulsed laser deposition (PLD) at room temperature. The films were grown on (100)-SrTiO₃ (STO) substrates at room temperature by PLD. Hall results of the Cs₂SnI₆ films with different components realizing by controlling the ratio of SnI₄/CsI in the targets demonstrate a clear change of conductivity type from N-type to P-type, while the carrier concentration decreases from 10¹⁸ to 10¹³ and accordingly the film resistivity increases significantly from 3.8 to 2506 Ω cm. The defect-related optical fingerprints of Cs₂SnI₆ films were also investigated with temperature-dependent photoluminescence spectroscopy. At low temperatures of 10 K, the Cs₂SnI₆ films exhibit donor-bound (D⁰X) and donor-acceptor pair (DAP) emission, respectively, due to the self-doping effect. These results indicate that controlling the composition of the PLD target is a powerful way to tune the electrical properties of Cs₂SnI₆ films for possible applications in solar cells or X-ray detectors.

Key words: Cs₂SnI₆ thin films, PLD, Target composition, Self-doping, Dopant compensation

Yansu Shan, Qingyang Zhang, Haoming Wei, Shiyu Mao, Luping Zhu, Xiaofan Liu, Xia Wang, Bingqiang Cao. Dopant compensation in component-dependent self-doped Cs₂SnI₆ thin films grown with PLD at room temperature[J]. J. Mater. Sci. Technol., 2025, 217: 9-17.

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Dopant compensation in component-dependent self-doped Cs₂SnI₆ thin films grown with PLD at room temperature

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