A new class of epitaxial porphyrin metal-organic framework thin films with extremely high photocarrier generation efficiency: promising materials for all-solid-state solar cells
Liu, J. / Zhou, W. / Liu, J. / Fujimori, Y. / Higashino, T. / Imahori, H. / Jiang, X. / Zhao, J. / Sakurai, T. / Hattori, Y. / Matsuda, W. / Seki, S. / Garlapati, S.K. / Dasgupta, S. / Redel, E. / Sunag, L. / Wöll, C (2016)
JOURNAL OF MATERIALS CHEMISTRY A, (2016), 4, 33, 12739-12747
- Date: 2016
We demonstrate the fabrication ofanewclassofepitaxialporphyrinmetal-organicframeworkthinfilms whose photophysical properties can be tuned by the introduction of electron-donating diphenylamine (DPA) groups into the porphyrin skeleton. The attachment of DPA groups results in strongly improved absorption characteristics, yielding the highest photocarriergenerationefficiency reported so far.
DFT calculations identify a shift of the charge localization pattern in the VBM (lowest unoccupied molecular orbital), confirming that the introduction of the DPA groups is the main reason for the shift of the optical absorption spectrum and the improved photocurrent generation.