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Panchromatically Responsive Organic Photodiodes utilizing a Noninvasive Narrowband Color Electrode

Title
Panchromatically Responsive Organic Photodiodes utilizing a Noninvasive Narrowband Color Electrode
Authors
Shafian, ShafidahKim, Kyungkon
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2020
Journal Title
ACS APPLIED MATERIALS & INTERFACES
ISSN
1944-8244JCR Link

1944-8252JCR Link
Citation
ACS APPLIED MATERIALS & INTERFACES vol. 12, no. 47, pp. 53012 - 53020
Keywords
panchromatic electrodeorganic photodiodenarrowband optical filterFabry-Perot optical filter-electrode
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
Organic photodiodes (OPDs) are emerging as potential candidates in image sensors owing to their high sensitivity and submicron photoactive layer thickness. For OPDs to be more competitive, it is necessary to develop an economical fabrication process and improve their narrowband spectral response from visible to near-infrared (NIR). In this study, panchromatic OPDs with a remarkable narrowband response from visible to NIR are developed by integrating a solution-processed optical filter-electrode (OF-electrode) and a panchromatic organic photoactive layer. Solution-processable TiO2 nanoparticles (sTNPs) bound to an acetylacetone ligand are used to construct the OF-electrode, which had the structure Ag/sTNP/Ag, and a ternary blend of a polymer donor, a nonfullerene acceptor, and a fullerene acceptor is used for preparing the panchromatic organic photoactive layer. Direct integration of the OF-electrode with the organic photoactive layer eliminates the need for additional OF installation, without damaging the underlying organic photoactive layer. Variation of the sTNP layer thickness controls the color filtering wavelength to vary from visible to NIR, with exceptionally narrow full width at half-maximum (fwhm) values of 48-82 nm and transparency values of 50-70%. Owing to their selective response for the desired color and their capability to minimize noise from other colors, the OPDs exhibit high sensitivity values of 2.82 x 10(12), 3.02 x 10(12), and 3.94 x 10(12) cm Hz(0.5)/W (Jones) with narrow fwhm values of 110, 91, and 75 nm at a peak transmittance exceeding 65% for blue, green, and red, respectively. Furthermore, they detect NIR light at a wavelength of 950 nm with a narrow fwhm value of 51 nm and a high sensitivity of 3.78 x 10(12) cm Hz(0.5)/W (Jones).
DOI
10.1021/acsami.0c17183
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자연과학대학 > 화학·나노과학전공 > Journal papers
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