Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Morphology dependent optical anisotropies in the n-type polymer
  P(NDI2OD-T2)   Organic semiconductors tend to self-assemble into highly ordered and oriented
morphologies with anisotropic optical properties. Studying these optical
anisotropies provides insight into processing-dependent structural properties
and informs the photonic design of organic photovoltaic and light-emitting
devices. Here, we measure the anisotropic optical properties of spin-cast films
of the n-type polymer P(NDI2OD-T2) using momentum-resolved absorption and
emission spectroscopies. We quantify differences in the optical anisotropies of
films deposited with distinct face-on and edge-on morphologies. In particular,
we infer a substantially larger out-of-plane tilt angle of the optical
transition dipole moment in high temperature annealed, edge-on films.
Measurements of spectral differences between in-plane and out-of-plane dipoles,
further indicate regions of disordered polymers in low temperature annealed
face-on films that are otherwise obscured in traditional X-ray and optical
characterization techniques. The methods and analysis developed in this work
provide a way to identify and quantify subtle optical and structural
anisotropies in organic semiconductors that are important for understanding and
designing highly efficient thin film devices.

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The categories of this paper are: math
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
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The categories of this paper are: quant-ph