Third crystalline form of P(NDI2OD-T2) with pronounced end-on texture

Doan Vu, Wen Liang Tan, Lu He, Alexander Ehm, Dietrich R.T. Zahn, Christopher R. McNeill

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


We report the observation of a third crystalline polymorph, “form III”, of the well-studied electron-transporting conjugated polymer P(NDI2OD-T2) that exhibits end-on texture. This third polymorph of P(NDI2OD-T2) is distinguished from other polymorphs by having two monomer units incorporated along the backbone-stacking direction, resulting in a doubling of the c axis of the unit cell. Form III crystallites are realized by melt-annealing a thin film followed by slow cooling. The distinct packing of this third polymorph is established through the application of grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements combined with peak simulation of candidate unit cells. The discovery of a third polymorph of P(NDI2OD-T2) provides a fresh opportunity for studying structure/function relationships of this important semiconducting polymer.

Original languageEnglish
Pages (from-to)140-146
Number of pages7
JournalACS Macro Letters
Issue number2
Publication statusPublished - 21 Jan 2023

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