Schematic
Studies on the Structural Properties and Device Physics of All Small
Molecule Ternary Photovoltaic Cells
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Abstract
Although
the field of ternary organic solar cells has seen much progress in
terms of device performance in the past few years, limited understanding
has restricted further development. For example, studies of the crystalline
packing structure of ternary blends have rarely been reported in the
solar cell field. Consequently, we chose two ternary blends of small
molecules, two fullerene derivatives (small-molecule:PC<sub>71</sub>BM:PC<sub>61</sub>BM or small-molecule:PC<sub>71</sub>BM:ICBA), to
investigate crystallization behavior and interactions among the three
components. The crystalline structure of the ternary active blends
was characterized using various techniques such as 2D-GIWAXS and AFM,
and the relationship of the observed morphologies to device performance
is discussed. Furthermore, the device physics associated with the
charge generation, transport, and recombination dynamics of these
ternary blend systems were investigated