1 research outputs found
Understanding Morphology Compatibility for High-Performance Ternary Organic Solar Cells
Ternary
organic solar cells are emerging as a promising strategy
to enhance device power conversion efficiency by broadening the range
of light absorption via the incorporation of additional light-absorbing
components. However, how to find compatible materials that allow comparable
loadings of each component remains a challenge. In this article, we
focus on studying the donor polymer compatibilities in ternary systems
from a morphological point of view. Four typical donor polymers with
different chemical structures and absorption ranges were mutually
combined to form six distinct ternary systems with fullerene derivative
acceptors. Two compatible ternary systems were identified as showing
significant improvements of efficiency from both binary control devices.
Ternary morphologies were characterized by grazing incident X-ray
scattering and correlated with device performance. We find that polymers
that have strong lamellar interactions and relatively similar phase
separation behaviors with the fullerene derivative are more likely
to be compatible in ternary systems. This result provides guidance
for polymer selection for future ternary organic solar cell research
while relaxing the limitation of chemical structure similarity and
greatly extends the donor candidate pool