Journal article

Publication year: 2017

Pages: 42020-42028

Journal: ACS Applied Materials & Interfaces

Volume number: 9

Issue number: 48

ISSN: 1944-8244

eISSN: 1944-8252

Open access status: Green

DOI Link: https://doi.org/10.1021/acsami.7b11118

Publisher: American Chemical Society

Abstract: 
The great majority of electronic and optoelectronic devices depend on interfaces between p-type and n-type semiconductors. Finding matching donor-acceptor systems in molecular semiconductors remains a challenging endeavor because structurally compatible molecules may not necessarily be suitable with respect to their optical and electronic properties, and the large exciton binding energy in these materials may favor bound electron-hole pairs rather than free carriers or charge transfer at an interface. Regardless, interfacial charge-transfer exciton states are commonly considered as an intermediate step to achieve exciton dissociation. The formation efficiency and decay dynamics of such states will strongly depend on the molecular makeup of the interface, especially the relative alignment of donor and acceptor molecules. Structurally well-defined pentacene-perfluoropentacene heterostructures of different molecular orientations are virtually ideal model systems to study the interrelation between molecular packing motifs at the interface and their electronic properties. Comparing the emission dynamics of the heterosystems and the corresponding unitary films enables accurate assignment of every observable emission signal in the heterosystems. These heterosystems feature two characteristic interface-specific luminescence channels at around 1.4 and 1.5 eV that are not observed in the unitary samples. Their emission strength strongly depends on the molecular alignment of the respective donor and acceptor molecules, emphasizing the importance of structural control for device construction.

Harvard Citation style: Rinn, A., Breuer, T., Wiegand, J., Beck, M., Huebner, J., Doering, R., et al. (2017) Interfacial Molecular Packing Determines Exciton Dynamics in Molecular Heterostructures: The Case of Pentacene-Perfluoropentacene, ACS Applied Materials & Interfaces, 9(48), pp. 42020-42028. https://doi.org/10.1021/acsami.7b11118

APA Citation style: Rinn, A., Breuer, T., Wiegand, J., Beck, M., Huebner, J., Doering, R., Oestreich, M., Heimbrodt, W., Witte, G., & Chatterjee, S. (2017). Interfacial Molecular Packing Determines Exciton Dynamics in Molecular Heterostructures: The Case of Pentacene-Perfluoropentacene. ACS Applied Materials & Interfaces. 9(48), 42020-42028. https://doi.org/10.1021/acsami.7b11118