Dopant-Induced Ordering of Amorphous Regions in Regiorandom P3HT

The Journal of Physical Chemistry Letters
Patrick Y YeeSarah H Tolbert

Abstract

Despite the fact that molecular doping of semiconducting polymers has emerged as a valuable strategy for improving the performance of organic electronic devices, the fundamental dopant-polymer interactions are not fully understood. Here we use 2-D grazing incidence wide-angle X-ray scattering (GIWAXS) to demonstrate that adding oxidizing small-molecule dopants, such as 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ) and FeCl3, into the amorphous conjugated polymer, regiorandom poly(3-hexylthiophene-2,5-diyl) (RRa-P3HT), improves polymer ordering and induces a change in domain orientation from isotropic to mostly edge-on. Doping thus causes RRa-P3HT to behave similarly to the more ordered regioregular P3HT. By comparing the optical, electrical, and structural properties of RRa-P3HT films doped with F4TNCQ and FeCl3 and those infiltrated with 7,7,8,8-tetracyanoquinodimethane (TCNQ), which occupies a similar volume as F4TCNQ but does not dope RRa-P3HT, we show that the increased ordering results not from the ability of the dopant to fill space but instead from the need to delocalize charge on the polymer in more than one dimension.

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Citations

Nov 20, 2020·Scientific Reports·Shuichi Nagamatsu, Shyam S Pandey
May 27, 2021·ACS Applied Materials & Interfaces·Harikrishna SahuRampi Ramprasad
Jun 24, 2020·The Journal of Physical Chemistry. B·Malavika ArvindDieter Neher
Oct 14, 2021·ACS Applied Materials & Interfaces·Songyan Yu, Erin L Ratcliff
Nov 18, 2021·Materials Horizons·Sepideh ZokaeiChristian Müller
Nov 19, 2021·Chemical Reviews·Alberto D ScaccabarozziThomas D Anthopoulos

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