Speaker
Mr
chao wang
(monash university)
Description
The photovoltaic properties of a series of diketopyrrolo[3,4-c]pyrrole (DPP) copolymers containing
3,4-ethylenedioxythiophene (EDOT) as a comonomer are reported. With use of different aryl
flanking units on the DPP core, namely thiophene, pyridine or phenyl, optical gaps ranging from
1.91 eV to 1.13 eV are achieved. When blended with the fullerene derivative [6,6]-phenyl C71-
butyric acid methyl ester (PC71BM), the thiophene-flanked copolymer PDPP[T]2-EDOT with an
optical gap of 1.13 eV was found to have the best photovoltaic performance, with an efficiency of
2.5% in an inverted device architecture. Despite having the lowest open circuit voltage of the three
polymers studied, PDPP[T]2-EDOT-based devices were able to achieve superior efficiencies due to
the high short circuit current of up to ~ 15 mA/cm2. PDPP[T]2-EDOT-based devices also exhibit
higher external quantum efficiencies which are associated with a superior microstructure as
revealed by transmission electron microscopy (TEM) and grazing incidence wide-angle X-ray
scattering (GIWAXS), which are associated with the enhanced aggregation tendency of PDPP[T]2-
EDOT chains. In particular PDPP[T]2-EDOT:PC71BM blends were found to have a finer phase
separated morphology with superior thin-film crystallinity. Surface morphology was also
investigated with atomic force microscopy and near-edge X-ray absorption fine-structure
spectroscopy.
| Are you a student? | Yes |
|---|---|
| Are you an ECR? (<5 yrs</br>since PhD/Masters) | No |
| What is your gender? | Male |
| Do you wish to take part in</br>the Student Poster Slam? | Yes |
| Keywords or phrases (comma separated) | polydiketopyrrolopyrroles, EDOT, polymer solar cells, bulk heterojunction, microstructure |
Primary author
Mr
chao wang
(monash university)
Co-authors
Chris McNeill
(Monash University)
Eliot Gann
(Australian Synchrotron)
