Processing factors affecting roughness, optical and mechanical properties of nanocellulose films for optoelectronics

This work aims to understand how nanocellulose (NC) processing can modify the key characteristics of NC films to align with the main requirements for high-performance optoelectronics. The performance of these devices relies heavily on the light transmittance of the substrate, which serves as a mecha...

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Bibliographic Details
Published in:Carbohydrate polymers 2024-05, Vol.332, p.121877-121877, Article 121877
Main Authors: Kaschuk, Joice Jaqueline, Al Haj, Yazan, Valdez Garcia, Joaquin, Kamppinen, Aleksi, Rojas, Orlando J., Abitbol, Tiffany, Miettunen, Kati, Vapaavuori, Jaana
Format: Article
Language:English
Subjects:
Anatomy
Basis Weight
Bio-based
Biobased substrate
Biobased substrates
Cellulose films
Cellulose nanofibrils
Electrostatics
Grammage
Hot Pressing
Light management
Morphology
Nanocellulose
Nanocellulose films
Nanofibers
Optical and mechanical properties
Optoelectronic
Processing factors
Solar cells
Substrates
Suspensions (fluids)
Sustainable electronics
Turbidity
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Summary:This work aims to understand how nanocellulose (NC) processing can modify the key characteristics of NC films to align with the main requirements for high-performance optoelectronics. The performance of these devices relies heavily on the light transmittance of the substrate, which serves as a mechanical support and optimizes light interactions with the photoactive component. Critical variables that determine the optical and mechanical properties of the films include the morphology of cellulose nanofibrils (CNF), as well as the concentration and turbidity of the respective aqueous suspensions. This study demonstrates that achieving high transparency was possible by reducing the grammage and adjusting the drying temperature through hot pressing. Furthermore, the use of modified CNF, specifically carboxylated CNF, resulted in more transparent films due to a higher nanosized fraction and lower turbidity. The mechanical properties of the films depended on their structure, homogeneity (spatial uniformity of local grammage), and electrokinetic factors, such as the presence of electrostatic charges on CNF. Additionally, we investigated the angle-dependent transmittance of the CNF films, since solar devices usually operate under indirect light. This work demonstrates the importance of a systematic approach to the optimization of cellulose films, providing valuable insight into the optoelectronic field. [Display omitted]
ISSN:0144-8617
1879-1344
1879-1344
DOI:10.1016/j.carbpol.2024.121877