Multifunctional ytterbium oxide buffer for perovskite solar cells.
Multifunctional ytterbium oxide buffer for perovskite solar cells.
复制标题
用于钙钛矿太阳能电池的多功能氧化镱缓冲剂。
DOI：
10.1038/s41586-023-06892-x
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发表时间：
2024-01
期刊：
影响因子：
64.8
通讯作者：
Peng Chen;Yun Xiao;Juntao Hu;Shunde Li;Deying Luo;R. Su;Pietro Caprioglio;P. Kaienburg
中科院分区：
文献类型：
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作者：
Peng Chen;Yun Xiao;Juntao Hu;Shunde Li;Deying Luo;R. Su;Pietro Caprioglio;P. Kaienburg
超导太阳能电池（PSC）包括夹在几层不同电荷选择性材料之间的固体钙钛矿吸收剂，确保器件的单向电流和高电压输出。在p型/本征/n型（p-i-n）PSC（也称为倒置PSC）中，电子选择性层和金属电极之间的“缓冲材料”使得电子能够从电子选择性层流动到电极。此外，它还充当阻挡层，抑制有害物质相互扩散到钙钛矿吸收剂中或降解产物从钙钛矿吸收剂中扩散出来。到目前为止，可蒸发的有机分子和原子层沉积的金属氧化物已经取得了成功，但每一种都有特定的缺陷。在这里，我们报告了一种化学稳定的多功能缓冲材料，氧化镱（YbOx），用于p-i-n PSC的可扩展的热蒸发沉积。我们在具有窄带隙钙钛矿吸收体的p-i-n PSC中使用了这种YbOx缓冲层，产生了超过25%的认证功率转换效率。我们还证明了YbOxin的广泛适用性，能够通过各种类型的钙钛矿吸收层实现高效的PSC，宽带隙钙钛矿吸收层的最新效率为20.1%，中带隙钙钛矿吸收层的最新效率为22.1%。此外，当经受ISO-L-3加速老化时，具有YbOx的封装器件表现出显著增强的器件稳定性。
Perovskite solar cells (PSCs) comprise a solid perovskite absorber sandwiched between several layers of different charge-selective materials, ensuring unidirectional current flow and high voltage output of the devices,. A ‘buffer material’ between the electron-selective layer and the metal electrode in p-type/intrinsic/n-type (p-i-n) PSCs (also known as inverted PSCs) enables electrons to flow from the electron-selective layer to the electrode, –. Furthermore, it acts as a barrier inhibiting the inter-diffusion of harmful species into or degradation products out of the perovskite absorber, –. Thus far, evaporable organic molecules,and atomic-layer-deposited metal oxides,have been successful, but each has specific imperfections. Here we report a chemically stable and multifunctional buffer material, ytterbium oxide (YbOx), for p-i-n PSCs by scalable thermal evaporation deposition. We used this YbOxbuffer in the p-i-n PSCs with a narrow-bandgap perovskite absorber, yielding a certified power conversion efficiency of more than 25%. We also demonstrate the broad applicability of YbOxin enabling highly efficient PSCs from various types of perovskite absorber layer, delivering state-of-the-art efficiencies of 20.1% for the wide-bandgap perovskite absorber and 22.1% for the mid-bandgap perovskite absorber, respectively. Moreover, when subjected to ISOS-L-3 accelerated ageing, encapsulated devices with YbOxexhibit markedly enhanced device stability.