In this work, two-dimensional conjugated covalent organic frameworks (2D-COF) based on a building block of tetraphenylethylene are successfully developed. Bicarbazole and pyrene moieties are respectively coupled with 4,4′,4′′,4′′′-(ethane-1,1,2,2-tetrayl)tetranilino (ETTA) via [4 + 4] solvothermal condensation conditions of 3,3′,6,6′-tetraformyl-9,9′-bicarbazole (Car-4CHO) and 1,3,6,8-tetrakis(4-formylphenyl)pyrene (TFPPy) to afford Car-ETTA and TFPPy-ETTA COFs. According to thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), and N₂ adsorption and desorption measurements, both Car-ETTA and TFPPy-ETTA COFs exhibit excellent thermal stability, highly crystalline structure, and high specific surface area, respectively. These findings are supported by force field and ab initio calculations. Furthermore, successful applications of these COFs in perovskite solar cells (PVSCs) are demonstrated owing to their well-conjugated properties and π–π interactions. While serving as interlayers in the devices, these COFs could effectively promote the interfacial charge dynamic to further optimize the resulting performance. Besides, certain interaction between COFs and perovskite also leads to an improved morphology and crystallinity of the perovskite layer, presenting defect passivation capability. As a result, we show that the performance of the COF-modified PVSC could be improved from 17.40 to 19.80%.

中文翻译：

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基于四苯基乙烯与联咔唑和pyr单元的二维共轭共价有机骨架的开发及其在钙钛矿太阳能电池中的应用

在这项工作中，成功开发了基于四苯基乙烯构件的二维共轭共价有机骨架（2D-COF）。联咔唑和pyr部分分别通过3的[4 + 4]溶剂热缩合条件与4,4'，4''，4''-（乙烷-1,1,2,2-四基）丁腈（ETTA）偶联，3'，6,6'-四甲酰基-9,9'-联咔唑（Car-4CHO）和1,3,6,8-四（4-甲酰基苯基）py（TFPPy）提供Car-ETTA和TFPPy-ETTA首席财务官。根据热重分析（TGA），粉末X射线衍射（PXRD）以及N ₂吸附和脱附测量，Car-ETTA和TFPPy-ETTACOF分别具有出色的热稳定性，高结晶结构和高比表面积。这些发现得到力场和从头算的支持。此外，由于它们的良好共轭性质和π-π相互作用，证明了这些COF在钙钛矿太阳能电池（PVSC）中的成功应用。这些COF在充当设备的中间层时，可以有效地促进界面电荷的动态变化，从而进一步优化最终的性能。此外，COF与钙钛矿之间的某些相互作用还导致钙钛矿层的形态和结晶性改善，从而表现出缺陷钝化能力。结果，我们表明，COF改性的PVSC的性能可以从17.40％提高到19.80％。