Manipulating Crystallographic Orientation via Cross-Linkable Ligand for Efficient and Stable Perovskite Solar Cells.
Manipulating Crystallographic Orientation via Cross-Linkable Ligand for Efficient and Stable Perovskite Solar Cells.
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DOI：
10.1002/smll.202207189
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发表时间：
2023-02
期刊：
影响因子：
13.3
通讯作者：
Shengfan Wu;Jie Zhang;Minchao Qin;Fengzhu Li;Xiang Deng;Xinhui Lu;Wen-Jung Li;A. Jen
中科院分区：
文献类型：
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作者：
Shengfan Wu;Jie Zhang;Minchao Qin;Fengzhu Li;Xiang Deng;Xinhui Lu;Wen-Jung Li;A. Jen
多晶钙钛矿的晶体取向被发现与其本征性质密切相关；因此，它可用于有效提高钙钛矿基器件的性能。在此，报道了一种以可控方式操纵多晶钙钛矿薄膜晶面取向的简便方法。通过将一种可交联的有机配体掺入钙钛矿前驱体溶液中，所得钙钛矿薄膜中的晶体取向无序性可降低，从而呈现出具有优选堆叠模式的显著的(001)取向。此外，在有机配体和过量碘化铅之间形成的低维钙钛矿（LDPs）能够钝化晶界周围的缺陷。因此，利用改性钙钛矿能够制成刚性和柔性两种形式的高效p - i - n结构钙钛矿太阳能电池（PSCs），其分别显示出24.12%和23.23%的高功率转换效率（PCE）。这些器件在潮湿环境中（T90>1000小时）以及在热应力下（1000小时后仍保持其初始PCE的87%）也表现出优异的长期稳定性。更重要的是，该配体使得衍生的LDPs能够（在254 nm紫外光照射下）交联，从而在柔性器件中展现出出色的机械弯曲耐久性。
The crystallographic orientation of polycrystalline perovskites is found to be strongly correlated with their intrinsic properties; therefore, it can be used to effectively enhance the performance of perovskite-based devices. Here, a facile way of manipulating the facet orientation of polycrystalline perovskite films in a controllable manner is reported. By incorporating a cross-linkable organic ligand into the perovskite precursor solution, the crystal orientation disorder can be reduced in the resultant perovskite films to exhibit the prominent (001) orientation with a preferred stacking mode. Moreover, the as-formed low-dimensional perovskites (LDPs) between the organic ligand and the excess lead iodide can passivate the defects around the grain boundaries. Consequently, highly efficient p-i-n structured perovskite solar cells (PSCs) can be made in both rigid and flexible forms from modified perovskites to show high power conversion efficiencies (PCE) of 24.12% and 23.23%, respectively. The devices also exhibit superior long-term stability in a humid environment (with T90 > 1000 h) and under thermal stress (retaining 87% of its initial PCE after 1000 h). More importantly, the ligand enables the derived LDPs to be crosslinked (under 254 nm UV illumination) to demonstrate excellent mechanical bending durability in flexible devices.