二維共價有機框架的開發及在鈣鈦礦太陽能電池中的應用

余明軒 ； M. G. Mohamed ； 李佳蓁 ； A. F. M. EL-Mahdy ； J. Lüder ； 郭紹偉 ； 闕居振

《化工》 68卷4期 (2021/08) Pp. 37-47

https://doi.org/10.29803/CE.202108_68(4).0005

摘要

我們成功開發以四苯基乙烯為構築單元的二維共軛共價有機框架材料（2D-COF）並應用於鈣鈦礦太陽能電池。ETTA首先通過〔4+4］溶劑熱縮合法分別與具有聯咔唑和芘結構的Car-4CHO和TFPPy合成得到Car-ETTA和TFPPy-ETTA的COFs。根據熱重分析、粉末X射線繞射、理論計算和N_2吸脫附量測結果顯示Car-ETTA和TFPPy-ETTA具有優異的熱穩定性、高結晶度結構和高比表面積。有鑑於其良好的共軛特性和π-π相互作用，我們成功將它們應用於鈣鈦礦太陽能電池。當Car-ETTA和TFPPy-ETTA COFs在元件中作為電洞傳輸層與鈣鈦礦主動層的夾層時，可有效促進界面電荷轉移。同時，我們也發現它們能與鈣鈦礦產生交互作用改善鈦礦層的形貌和結晶度，展現鈍化缺陷的能力。最終，經由COF改質的鈣鈦礦太陽能電池性能可以從17.40％提高到19.80％。

關鍵字

二維共價有機框架 ； 鈣鈦礦太陽能電池 ； 界面材料

並列摘要

We successfully synthesize two-dimensional conjugated covalent organic frameworks (2D-COF) based on a building block of tetraphenylethylene and apply them for perovskite solar cells (PVSCs). 4,4',4＂,4＂'-(ethane-1,1,2,2-tetrayl) tetranilino (ETTA) respectively couples with bicarbazole and pyrene moieties 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 obtain Car-ETTA and TFPPy-ETTA COFs. According to thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), theoretical calculations, and N_2 adsorption and desorption measurements, both Car-ETTA and TFPPy-ETTA COFs exhibit excellent thermal stability, highly crystalline structure, and high specific surface area. Owing to their well-conjugated properties and π-π interactions, we successfully apply these COFs in PVSCs. While serving as an interlayer at the hole-transporting layer/perovskite interface, these COFs could effectively promote the interfacial charge transfer. Meanwhile, we discover certain interactions between these COFs and perovskite that improve the morphology and crystallinity of the perovskite films, showing defect passivation capability. Finally, we show that the power conversion efficiency of the COF-modified PVSC could be improved from 17.40 to 19.80 %.

並列關鍵字

Covalent organic frameworks ； perovskite solar cells ； interfacial materials