Toward Metal–Organic Framework-Based Solar Cells: Enhancing Directional Exciton Transport by Collapsing Three-Dimensional Film Structures

• DOI: 10.1021/acsami.6b08552
• Publication Date: 2016-10-21T19:57:49Z
• Authors: Subhadip Goswami; Lin Ma; Alex B. F. Martinson; Michael R. Wasiel...; Omar K. Farha; Joseph T. Hupp
• Keywords: Chromophore

Owing to their ability act as light-harvesting scaffolds, porphyrin-containing metal-organic frameworks (MOFs) are in the forefront of research on application highly ordered molecular materials problems solar-energy conversion. In this work, solvent-assisted linker exchange (SALE) is performed a pillared paddlewheel porphyrin containing MOF thin film collapse 3D framework 2D framework. The change dimensionality confirmed by decrease thickness, magnitude which agreement with crystallographic parameters for related bulk materials. Furthermore, NMR spectroscopy digested sample suggests similar geometry achieved samples. decreased distance between chromophores compared results enhanced energy transfer through film. extent transport was probed assembling where outermost layers palladium (P2) units, traps and fluorescence quenchers. Steady-state emission together time-resolved indicates that excitons can travel about 9-11 (porphyrin layers) films, whereas films occurs no more than 6-8 layers. difficult understand if only changes interlayer spacing considered but become much understandable dipole-dipole coupling distances considered.