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Title: Flexible nanograss with highest combination of transparency and haze for optoelectronic plastic substrates

Abstract

Transparent polymer substrates have recently received increased attention for various flexible optoelectronic devices. Optoelectronic applications such as solar cells and light emitting-diodes would benefit from substrates with both high transparency and high haze, which increase how much light scatters into or out of the underlying photoactive layers. In this letter, we demonstrate a new flexible nanograss plastic substrate that displays the highest combination of transparency and haze in the literature for polyethylene terephthalate (PET). Here, as opposed to other nanostructures that increase haze at the expense of transparency, our nanograss demonstrates the potential to improve both haze and transparency. Furthermore, the monolithic nanograss may be fabricated in a facile scalable maskless reactive ion etching process without the need for additional lithography or synthesis of nanostructures. Our 9 μm height nanograss sample exhibits a transparency and haze of 92.4% and 89.4%, respectively, and our 34 μm height nanograss displays a transparency and haze of 91.0% and 97.1%, respectively. We also performed durability experiments that demonstrate these nanostructured PET substrates are robust from bending and show similar transmission and haze values after 5000 cycles of bending.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [1]; ORCiD logo [2];  [2]; ORCiD logo [1]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Publication Date:
Research Org.:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Org.:
FE; USDOE
OSTI Identifier:
1509726
Report Number(s):
[NETL-PUB-22328]
[Journal ID: ISSN 0957-4484]
Grant/Contract Number:  
[FE0004000]
Resource Type:
Accepted Manuscript
Journal Name:
Nanotechnology
Additional Journal Information:
[ Journal Volume: 29; Journal Issue: 42]; Journal ID: ISSN 0957-4484
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 77 NANOSCIENCE AND NANOTECHNOLOGY; light diffuser sheet; sub-wavelength structure; hazy plastic

Citation Formats

Haghanifar, Sajad, Rodriguez De Vecchis, Rafael T., Kim, Ki -Joong, Wuenschell, Jeffrey, Sharma, Sooraj P., Lu, Ping, Ohodnicki, Paul, and Leu, Paul W. Flexible nanograss with highest combination of transparency and haze for optoelectronic plastic substrates. United States: N. p., 2018. Web. doi:10.1088/1361-6528/aad671.
Haghanifar, Sajad, Rodriguez De Vecchis, Rafael T., Kim, Ki -Joong, Wuenschell, Jeffrey, Sharma, Sooraj P., Lu, Ping, Ohodnicki, Paul, & Leu, Paul W. Flexible nanograss with highest combination of transparency and haze for optoelectronic plastic substrates. United States. doi:10.1088/1361-6528/aad671.
Haghanifar, Sajad, Rodriguez De Vecchis, Rafael T., Kim, Ki -Joong, Wuenschell, Jeffrey, Sharma, Sooraj P., Lu, Ping, Ohodnicki, Paul, and Leu, Paul W. Mon . "Flexible nanograss with highest combination of transparency and haze for optoelectronic plastic substrates". United States. doi:10.1088/1361-6528/aad671. https://www.osti.gov/servlets/purl/1509726.
@article{osti_1509726,
title = {Flexible nanograss with highest combination of transparency and haze for optoelectronic plastic substrates},
author = {Haghanifar, Sajad and Rodriguez De Vecchis, Rafael T. and Kim, Ki -Joong and Wuenschell, Jeffrey and Sharma, Sooraj P. and Lu, Ping and Ohodnicki, Paul and Leu, Paul W.},
abstractNote = {Transparent polymer substrates have recently received increased attention for various flexible optoelectronic devices. Optoelectronic applications such as solar cells and light emitting-diodes would benefit from substrates with both high transparency and high haze, which increase how much light scatters into or out of the underlying photoactive layers. In this letter, we demonstrate a new flexible nanograss plastic substrate that displays the highest combination of transparency and haze in the literature for polyethylene terephthalate (PET). Here, as opposed to other nanostructures that increase haze at the expense of transparency, our nanograss demonstrates the potential to improve both haze and transparency. Furthermore, the monolithic nanograss may be fabricated in a facile scalable maskless reactive ion etching process without the need for additional lithography or synthesis of nanostructures. Our 9 μm height nanograss sample exhibits a transparency and haze of 92.4% and 89.4%, respectively, and our 34 μm height nanograss displays a transparency and haze of 91.0% and 97.1%, respectively. We also performed durability experiments that demonstrate these nanostructured PET substrates are robust from bending and show similar transmission and haze values after 5000 cycles of bending.},
doi = {10.1088/1361-6528/aad671},
journal = {Nanotechnology},
number = [42],
volume = [29],
place = {United States},
year = {2018},
month = {8}
}

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