Application of triphenylamine dendritic polymer in a complementary electrochromic device with panchromatic absorption
Journal
Solar Energy Materials and Solar Cells
Journal Volume
143
Pages
174-182
Date Issued
2015
Author(s)
Abstract
Abstract Application of poly(N′, N″, N⌄-tris[N, N-bis-(4′-diphenylamino-biphenyl-4-yl)phenyl]-1, 3, 5-benzene tricarboxamide) (PG1), a triphenylamine dendritic polymer, in an complementary electrochromic device (ECD) has been studied. Electrochromic transitions of PG1 itself give very significant transmittance change (ΔT) of 58.4% at 485 nm and 81.8% at 780 nm with rather good cycling stability. A complementary ECD based on the PG1 thin film and poly(3,4-ethylenedioxythiophene) (PEDOT) thin film was assembled to demonstrate panchromatic absorption characteristic through a simple fabrication process. This ECD exhibits black-to-transmissive electrochromism when switched from -0.4 to 1.5 V. Large variation in L∗value in CIE L∗a∗b∗coordinate (45.6) and ΔT (55.5% at 510 nm) is observed. In fact, the ΔT value achieved in this work is comparable to the highest value (58%) among all reported triphenylamine derivative/PEDOT ECDs after an extensive literature search. Furthermore, good cycling stability is achieved in the proposed ECD, which still retained panchromatic absorption characteristic and maintained 91.7% of the initial ΔT value at 510 nm after continuous 10,000 switchings.
Type
journal article