Photoinduced Charge-Carrier Generation in Epitaxial MOF Thin Films: High Efficiency as a Result of an Indirect Electronic Band Gap?

Liu J, Zhou W, Liu J, Howard I, Kilibarda G, Schlabach S, Coupry D, Addicoat M, Yoneda S, Tsutsui Y, Sakurai T, Seki S, Wang Z, Lindemann P, Redel E, Heine T, Woell C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Angewandte Chemie International Edition Wiley

Book Volume: 54

Pages Range: 7441-7445

Journal Issue: 25

DOI: 10.1002/anie.201501862

Abstract

For inorganic semiconductors crystalline order leads to a band structure which gives rise to drastic differences to the disordered material. An example is the presence of an indirect band gap. For organic semiconductors such effects are typically not considered, since the bands are normally flat, and the band-gap therefore is direct. Herein we show results from electronic structure calculations demonstrating that ordered arrays of porphyrins reveal a small dispersion of occupied and unoccupied bands leading to the formation of a small indirect band gap. We demonstrate herein that such ordered structures can be fabricated by liquid-phase epitaxy and that the corresponding crystalline organic semiconductors exhibit superior photophysical properties, including large charge-carrier mobility and an unusually large charge-carrier generation efficiency. We have fabricated a prototype organic photovoltaic device based on this novel material exhibiting a remarkable efficiency.

Involved external institutions

Karlsruhe Institute of Technology (KIT) DE Germany (DE) Jacobs University Bremen gGmbH DE Germany (DE) Osaka University JP Japan (JP)

How to cite

APA:

Liu, J., Zhou, W., Liu, J., Howard, I., Kilibarda, G., Schlabach, S.,... Woell, C. (2015). Photoinduced Charge-Carrier Generation in Epitaxial MOF Thin Films: High Efficiency as a Result of an Indirect Electronic Band Gap? Angewandte Chemie International Edition, 54(25), 7441-7445. https://doi.org/10.1002/anie.201501862

MLA:

Liu, Jinxuan, et al. "Photoinduced Charge-Carrier Generation in Epitaxial MOF Thin Films: High Efficiency as a Result of an Indirect Electronic Band Gap?" Angewandte Chemie International Edition 54.25 (2015): 7441-7445.

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