TY  - JOUR
A1  - Steyrleuthner, Robert
A1  - Schubert, Marcel
A1  - Howard, Ian
A1  - Klaumünzer, Bastian
A1  - Schilling, Kristian
A1  - Chen, Zhihua
A1  - Saalfrank, Peter
A1  - Laquai, Frederic
A1  - Facchetti, Antonio
A1  - Neher, Dieter
T1  - Aggregation in a high-mobility n-type low-bandgap copolymer with implications on semicrystalline morphology
JF  - Journal of the American Chemical Society
N2  - We explore the photophysics of P(NDI2OD-T2), a high-mobility and air-stable n-type donor/acceptor polymer. Detailed steady-state UV-vis and photoluminescence (PL) measurements on solutions of P(NDI2OD-T2) reveal distinct signatures of aggregation. By performing quantum chemical calculations, we can assign these spectral features to unaggregated and stacked polymer chains. NMR measurements independently confirm the aggregation phenomena of P(NDI2OD-T2) in solution. The detailed analysis of the optical spectra shows that aggregation is a two-step process with different types of aggregates, which we confirm by time-dependent PL measurements. Analytical ultracentrifugation measurements suggest that aggregation takes place within the single polymer chain upon coiling. By transferring these results to thin P(NDI2OD-T2) films, we can conclude that film formation is mainly governed by the chain collapse, leading in general to a high aggregate content of similar to 45%. This process also inhibits the formation of amorphous and disordered P(NDI2OD-T2) films.
Y1  - 2012
U6  - https://doi.org/10.1021/ja306844f
SN  - 0002-7863
VL  - 134
IS  - 44
SP  - 18303
EP  - 18317
PB  - American Chemical Society
CY  - Washington
ER  -