Pure Iodide Multication Wide Bandgap Perovskites by Vacuum Deposition AITranslate

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DOI：https://doi.org/10.1021/acsmaterialslett.3c01094

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The CsPbI3 perovskite has a suitable bandgap (≈1.7 eV) for application in tandem solar cells. One challenge for this compound is that the semiconducting perovskite phase is not stable at room temperature, when it tends to form a yellow nonperovskite phase with a bandgap of approximately 2.8 eV. Therefore, many reports have been focused on the stabilization of the CsPbI3 black perovskite phase through the use of additives during solution processing. Vacuum deposited CsPbI3 has been seldom reported, as in this case, the insertion of stabilizing agents is more challenging. In this work, we demonstrate the vacuum processing of CsPbI3 perovskite films at room temperature, obtained by incorporating dimethylammonium iodide by cosublimation with CsI and PbI2. As-prepared films were applied in planar solar cells, leading to an average power conversion efficiency (PCE) exceeding 12%. In order to improve the device performance, we introduced a third A-site cation (methylammonium) in a four-source deposition process. This pure iodide formulation can be used in wide bandgap solar cells with a PCE up to 14.8%.