Ground State Host-Guest Interactions upon Effective Dispersion of Regioregular Poly(3-hexylthiophene) in Poly(9,9-dioctylfluorene-alt-benzothiadiazole)
Journal article, 2015

Regioregular poly(3-hexylthiophene), (rr-P3HT), is widely regarded as an archetypical semiconducting electron-donor polymer in bulk heterojunction solar cells, mainly due to its notable exciton and charge transport properties. Conversely, its use in photonic/lighting devices received little interest owing to its low emission quantum yield in the solid state, related to its large tendency to self-organize into lamellar domains with highly nonemissive character. We present experimental evidence pointing to a large miscibility of P3HT in poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT), accompanied by mutual pi-pi interactions. Concomitant to this effect, the emission properties of P3HT:F8BT blends, which are attributed to heterogeneous interchain complexes, experience a significant improvement, with photoluminescence quantum efficiency (PLQE) values approaching 25% (almost a 7-fold efficiency enhancement with respect to neat/aggregated rr-P3HT). Our results open up new prospects for improved photonic properties through appropriate control of interchain interactions.

Author

L. F. Wu

Complutense University

S. Casado

Complutense University

B. Romero

Universidad Rey Juan Carlos

J. M. Oton

Escuela Tecnica Superior de Ingenieros de Telecomunicacion, Madrid

J. Morgado

Instituto Superior Tecnico

Instituto de Telecomunicações

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

R. Xia

Nanjing University of Posts and Telecommunications

J. Cabanillas-Gonzalez

Complutense University

Macromolecules

00249297 (ISSN) 15205835 (eISSN)

Vol. 48 24 8765-8772

Subject Categories

Polymer Chemistry

DOI

10.1021/acs.macromol.5b02111

More information

Latest update

6/20/2018