A polymer donor with versatility for fabricating high-performance ternary organic photovoltaics
Journal
Chemical Engineering Journal
Journal Volume
431
Date Issued
2022
Author(s)
Abstract
The success of ternary organic photovoltaics (OPVs) has led to more attention being placed on understanding the mechanism through which the third component can affect the performance. In this study we embedded the conjugated polymer PTO2 as the third component in PM6:Y6 and PM6:BTP-eC9 blends and investigated the optoelectronic properties of the resulting efficient and stable OPVs. PTO2 displayed complementary absorption, high miscibility, and a HOMO energy level deeper than that of PM6, thereby enhancing the degrees of light harvesting, forming suitable blend morphologies, and lowering the energy losses of the devices, respectively. The miscibility of PTO2 with the acceptor altered the molecular packing of the ternary blend films and resulted in the optimized PM6:Y6 and PM6:BTP-eC9 OPVs having power conversion efficiencies of up to 17.05 and 18.01%, respectively. Furthermore, the embedding of PTO2 improved the long-term stability of the devices when exposed to light (halogen lamp; 0.67 mW/cm2, 740 lx), heat (85 °C, argon), or water/oxygen (without encapsulation; air of 40% humidity). Our results provide guidelines for the design of stable high-performance ternary OPVs. ? 2021 Elsevier B.V.
Subjects
Conjugated polymer
Miscibility
Organic photovoltaic
Solar cell
Stability
Energy dissipation
Organic solar cells
Platinum compounds
Solar power generation
Solubility
Blend films
Blend morphology
HOMO energy levels
Light-harvesting
Molecular packings
Optoelectronics property
Organic photovoltaics
Performance
Ternary blends
Third component
Conjugated polymers
SDGs
Type
journal article