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Stepwise change of conjugated polymer:acceptor blend properties with acceptor electron affinityтезисы доклада
- Авторы: Sosorev A.Yu, Pavelyev V.G., Parashchuk O.D., Perepichka I.F., Levin E.E., Pshenichnikov M.S., Paraschuk D.Yu
- Сборник: Book of Abstracts of 3rd INTERNATIONAL FALL SCHOOL ON ORGANIC ELECTRONICS – 2016 (IFSOE-2016), Подмосковье, пансионат «Союз» (филиал ОАО «Газпром»), Россия, 18-23 сентября 2016
- Тезисы
- Год издания: 2016
- Первая страница: 56
- Последняя страница: 56
- Аннотация: Blends of conjugated polymers with small-molecule acceptors are widely used as active layers oforganic solar cells. The blend morphology is of high importance for the deviceperformanceand is strongly dependent on the interplay between the donor-donor, acceptor-acceptor and donor-acceptor interactions.Some conjugated polymersform charge transfer complexes(CTCs)with small-molecule acceptors modifying donor-acceptor interaction1.CTCscan be inherited from solution into thefilmresulting in dramatic changes in the film photophysics2.However, a systematical study of the role of the donor-acceptor charge-transfer interaction in the blend morphology was not performed yet. In this work, we address the effectof the donor-acceptorinteraction on the film morphology and photophysics for blends of model conjugated polymer MEH-PPV with electron acceptors of the fluorene series.The donor-acceptor interaction was tuned by varyingthe acceptor electron affinity(EA), since CTC is stronger for higher EA.We observedastepwise morphology change when the acceptor EAexceeds a threshold value.Specifically, the X-ray diffraction data(Fig. 1a,b)indicatean abrupt crossover from the segregated polymer and acceptor phases fortheblends with low EA(< 3.7 eV)acceptors to the semicrystalline intermixed structurefor the blendswith high EA(> 3.7 eV)acceptors. According to Raman spectroscopy data(Fig. 1b,black dots), this crossover is accompanied by a stepwise increase in ground-state charge transferfor high-EAacceptors.Similar stepwise behavior wasobserved in polymer photoluminescencequenching(Fig. 1b, blue triangles) showing the close relation between the morphology and photophysics.To explain our data, we proposea morphological model based on the Flory-Hugginstheory.
- Добавил в систему: Паращук Ольга Дмитриевна