Control of morphology and performance of diketopyrrolopyrrole-based electrochromic polymers using solvent vapor annealing

Post-deposition treatment including thermal and solvent annealing of polymer films in various organic electronics such as organic photovoltaics and organic thin film transistors plays a vital role in governing the film morphology and consequently their optical and electronic properties. However, suc...

Full description

Saved in:
Bibliographic Details
Published in:Journal of polymer research 2018-03, Vol.25 (3), p.1-10, Article 68
Main Authors: Neo, Wei Teng, Ye, Qun, Shi, Zugui, Chua, Soo-Jin, Xu, Jianwei
Format: Article
Language:English
Subjects:
Acetone
Annealing
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Chloroform
Electrochromism
Heat treatment
Industrial Chemistry/Chemical Engineering
Morphology
Optical properties
Original Paper
Photovoltaic cells
Polymer films
Polymer Sciences
Polymers
Semiconductor devices
Solar cells
Solvents
Switching
Thin film transistors
Vapors
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Post-deposition treatment including thermal and solvent annealing of polymer films in various organic electronics such as organic photovoltaics and organic thin film transistors plays a vital role in governing the film morphology and consequently their optical and electronic properties. However, such a post-treatment method has yet been used for electrochromics. This paper studied the influence of solvent vapor annealing of a diketopyrrolopyrrole-containing electrochromic conjugated polymer on its film morphology. Compared to an un-annealed film, the films exposed to acetone vapor and chloroform vapor are generally composed of polymer clusters with smaller domain sizes and more compact, aggregated structures. Subsequent evaluation of the electrochromic performances of the devices revealed the strong influence of the film morphologies on the optical contrasts, switching times and coloration efficiencies. In general, the electrochromic films treated with a poor solvent (acetone) exhibited faster switching speeds and improved coloration efficiencies. In contrast, treatment with a good solvent (chloroform) had destructive effects on the optical contrasts, switching speeds and coloration efficiency of the films. These findings showed that the electrochromic performance closely corresponded to changes in the film structure and morphology.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-018-1458-x