Reduced-Dimensional α-CsPbX3 Perovskites for Efficient and Stable Photovoltaics

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Abstract

Inorganic CsPbX3 perovskites have gained great attention owing to their excellent thermal stability and carrier transport properties. However, the power conversion efficiency (PCE) of solution-processed CsPbX3 perovskite solar cells is still far inferior to that of their hybrid analogues. Insufficient film thickness and undesirable phase transition are the two major obstacles limiting their device performance. Here, we show that by adopting a new precursor pair, cesium acetate (CsAc) and hydrogen lead trihalide (HPbX3), we were able to overcome the notorious solubility limitation for Cs precursors to fabricate high-quality CsPbX3 perovskite films with large film thickness (∼500 nm). We further introduced a judicious amount of phenylethylammonium iodide (PEAI) into the system to induce reduced-dimensional perovskite formation. Unprecedentedly, the resulting quasi-2D perovskites significantly suppressed undesirable phase transition and thus reduced the film's trap density. Following this approach, we reported a state-of-the-art PCE to date, 12.4%, for reduced-dimensional α-CsPbI3 perovskite photovoltaics with greatly improved performance longevity. Insufficient film thickness and undesirable phase transition are the two major obstacles that limit the performance of inorganic CsPbX3 perovskite devices. We found that, by adopting a new precursor pair, cesium acetate (CsAc) and hydrogen lead trihalide (HPbX3), we were able to overcome the notorious solubility limitation for Cs precursors to fabricate high-quality CsPbX3 perovskite films with large film thickness (∼500 nm). Moreover, further introduction of a judicious amount of PEAI into the new precursor system can induce reduced-dimensional, inorganic quasi-2D perovskite formation, and the resulting inorganic quasi-2D perovskites significantly suppressed the undesirable phase transition. Following this approach, we reported a state-of-the-art power conversion efficiency to date, 12.4%, for reduced-dimensional inorganic α-CsPbI3 perovskite solar cells with greatly improved performance longevity. CsAc and HPbX3 were adopted in CsPbX3 perovskite preparation, which led to high-quality CsPbX3 perovskite films with large film thickness (>500 nm). Taking advantage of this new precursor system, efficient CsPbIBr2 inorganic perovskite solar cells with record power conversion efficiency (PCE) of 8.54% were achieved. By introducing a judicious amount of PEAI into the new precursor pair, inorganic quasi-2D perovskites emerged and delivered a reproducible PCE of 12.4% for α-CsPbI3 with greatly improved stability.

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Jiang, Y., Yuan, J., Ni, Y., Yang, J., Wang, Y., Jiu, T., … Chen, J. (2018). Reduced-Dimensional α-CsPbX3 Perovskites for Efficient and Stable Photovoltaics. Joule, 2(7), 1356–1368. https://doi.org/10.1016/j.joule.2018.05.004

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