Approaching Theoretical Haze of Highly Transparent All-Cellulose Composite Film.
2020
A highly transparent
cellulose film with a high built-in haze is
emerging as a green photonic material for optoelectronics. Unfortunately,
attaining its theoretical haze still remains a challenge. Here, we
demonstrate an all-cellulose composite film with a 90.1% transmittance
and a maximal transmission haze of 95.2% close to the theoretical
limit (∼100%), in which the entangled network of softwood cellulose
fibers works as strong light scattering sources and regenerated cellulose
(RC) with undissolved fibril bundles functions as a matrix to simultaneously
improve the optical transparency and transmission haze. The underlying
mechanism for the ultrahigh haze is attributed to microsized irregularities
in the refractive index, arising primarily from the crystalline structure
of softwood fibers, undissolved nanofibril bundles in RC, and a small
number of internal cavities. Moreover, the resulting composite film
presents a folding resistance of over 3500 times and good water resistance,
and its application in a perovskite solar cell as an advanced light
management layer is demonstrated. This work sheds light on the design
of a highly transparent cellulose film with a haze approaching the
theoretical limit for optoelectronics and brings us a step further
toward its industrial production.
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