Influence of side groups on the performance of infrared absorbing aza-BODIPY organic solar cells

Kraner S, Widmer J, Benduhn J, Hieckmann E, Jaegeler-Hoheisel T, Ullbrich S, Schuetze D, Radke KS, Cuniberti G, Ortmann F, Lorenz-Rothe M, Meerheim R, Spoltore D, Vandewal K, Koerner C, Leo K (2015)

Publication Type: Journal article

Publication year: 2015

Journal

physica status solidi (a) Wiley

Book Volume: 212

Pages Range: 2747-2753

Journal Issue: 12

DOI: 10.1002/pssa.201532385

Abstract

Authoren Organic solar cells are a promising technology for a large area conversion of sunlight into electricity. In particular for solar cells based on oligomers (small molecules), efficient donor materials absorbing wavelengths larger than 780 nm are still rare. Here, we investigate three aza-BODIPY dyes absorbing in the infrared. The addition of side groups leads to a red shift of the optical gap from 802 to 818 nm. In optimized devices using these donors in a bulk heterojunction with C60, we observe a higher charge carrier mobility and a higher power conversion efficiency for the molecules without a methyl or methoxy side group lowering the molecular reorganization energy. Surprisingly, the donor-acceptor blend with the lowest energy loss during the electron transfer to the C60 yields the highest short circuit current. With increasing size of the attached side chain, the devices exhibit a larger trap density, measured by impedance spectroscopy. Based on the investigation of different blend ratios, we conclude that these traps are mainly present in the donor phase.

Involved external institutions

Technische Universität Dresden DE Germany (DE) University of Science and Technology (AGH) / Akademia Górniczo-Hutnicza PL Poland (PL)

How to cite

APA:

Kraner, S., Widmer, J., Benduhn, J., Hieckmann, E., Jaegeler-Hoheisel, T., Ullbrich, S.,... Leo, K. (2015). Influence of side groups on the performance of infrared absorbing aza-BODIPY organic solar cells. physica status solidi (a), 212(12), 2747-2753. https://doi.org/10.1002/pssa.201532385

MLA:

Kraner, Stefan, et al. "Influence of side groups on the performance of infrared absorbing aza-BODIPY organic solar cells." physica status solidi (a) 212.12 (2015): 2747-2753.

BibTeX: Download