Liu Chi-Kwen, Wu Kuo-Hung, Lu Yen-An, Hsiao Li-Yin, Lai Kuan-Wen, Chu Chih-Wei, Ho Kuo-Chuan
Department of Chemical Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 10617, Taiwan.
ACS Appl Mater Interfaces. 2021 Dec 22;13(50):60125-60134. doi: 10.1021/acsami.1c22144. Epub 2021 Dec 8.
A novel lead-containing metal-organic framework (Pb-MOF) is synthesized through postmetalation of MOF-525. Postmetalation renders lead ions bound with the organic linker of MOF-525, which can serve as nucleation points to promote perovskite crystallization. The introduction of lead postmetalated MOF-525 (Pb-MOF) as a scaffold layer between compact TiO (c-TiO) layer and perovskite layer promotes perovskite crystal growth in enlarging crystal grain size with better crystallinity, hence decreasing defect sites in the perovskite layer. Postmetalation of MOF-525 with lead ions allows MAPbI to form a solid crystal structure to facilitate the charge separation between electron transport layer (ETL) and light-harvesting layer so as to resolve the issue of possible vacancies present in MOFs. As a result, the champion perovskite solar cell (PSC) with the introduction of Pb-MOF exhibits a power conversion efficiency (PCE) of 20.87% and better stability (86% PCE retention after 40 days), outperforming the pristine PSC (16.85% PCE, with 52% retention after 40 days) and MOF-525-introduced PSC (18.61% PCE, with 76% retention after 40 days).
通过对MOF-525进行后金属化反应合成了一种新型含铅金属有机框架材料（Pb-MOF）。后金属化反应使铅离子与MOF-525的有机连接体结合，其可作为成核点促进钙钛矿结晶。在致密TiO（c-TiO）层和钙钛矿层之间引入后金属化铅的MOF-525（Pb-MOF）作为支架层，可促进钙钛矿晶体生长，增大晶粒尺寸并提高结晶度，从而减少钙钛矿层中的缺陷位点。用铅离子对MOF-525进行后金属化反应可使MAPbI形成固体晶体结构，有助于电子传输层（ETL）和光捕获层之间的电荷分离，从而解决MOF中可能存在的空位问题。结果，引入Pb-MOF的冠军钙钛矿太阳能电池（PSC）的功率转换效率（PCE）为20.87%，稳定性更好（40天后PCE保留率为86%），优于原始PSC（PCE为16.85%，40天后保留率为52%）和引入MOF-525的PSC（PCE为18.61%，40天后保留率为76%）。
