Sn-based halide perovskites are promising for thermoelectric (TE) device applications because of their high electrical conductivity as well as the low thermal conductivity associated with their soft lattices. However, conventional three-dimensional Sn-based perovskites are not stable under typical TE device operating conditions. Here, we report a stable two-dimensional Sn-based perovskite for thermoelectric energy conversion by incorporating bulky conjugated ligands. We demonstrate a thin film with a large power factor of 5.42 ± 3.07 (average) and 7.07 (champion) μW m^–1 K^–2 at 343 K with an electrical conductivity of 5.07 S cm^–1 and a Seebeck coefficient of 118.1 μV K^–1. Importantly, these thin films show excellent operational stability (i.e., for over 100 h) at 313 K. This work suggests that the novel hybrid two-dimensional perovskites are a promising platform for thermoelectric energy conversion applications.

中文翻译：

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具有共轭配体的无铅二维卤化物钙钛矿的热电性能

Sn 基卤化物钙钛矿因其高导电性以及与软晶格相关的低导热性而有望用于热电 (TE) 器件应用。然而，传统的三维 Sn 基钙钛矿在典型的 TE 设备工作条件下不稳定。在这里，我们报告了一种稳定的二维 Sn 基钙钛矿，通过结合庞大的共轭配体用于热电能量转换。我们展示了在 343 K 时具有5.42 ± 3.07（平均）和 7.07（冠军）μW m ^–1 K ^{–2 的}大功率因数的薄膜，电导率为 5.07 S cm ^–1，塞贝克系数为 118.1 μV K ^–1. 重要的是，这些薄膜在 313 K 下表现出优异的操作稳定性（即超过 100 小时）。这项工作表明，新型混合二维钙钛矿是热电能量转换应用的有前途的平台。