Ground State Host-Guest Interactions upon Effective Dispersion of Regioregular Poly(3-hexylthiophene) in Poly(9,9-dioctylfluorene-alt-benzothiadiazole)
Artikel i vetenskaplig tidskrift, 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.


L. F. Wu

Universidad Complutense de Madrid

S. Casado

Universidad Complutense de Madrid

B. Romero

Universidad Rey Juan Carlos

J. M. Oton

Escuela Tecnica Superior de Ingenieros de Telecomunicacion, Madrid

J. Morgado

Instituto Superior Tecnico

Instituto de Telecomunicaçon

Christian Müller

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

R. Xia

Nanjing University of Posts and Telecommunications

J. Cabanillas-Gonzalez

Universidad Complutense de Madrid


0024-9297 (ISSN) 1520-5835 (eISSN)

Vol. 48 24 8765-8772