Panchromatically Responsive Organic Photodiodes utilizing a Noninvasive Narrowband Color Electrode
- 주제(키워드) panchromatic electrode , organic photodiode , narrowband optical filter , Fabry-Perot optical filter-electrode , organic photodiode
- 주제(기타) Nanoscience & Nanotechnology
- 주제(기타) Materials Science, Multidisciplinary
- 설명문(일반) [Shafian, Shafidah; Kim, Kyungkon] Ewha Womans Univ, Dept Chem & Nanosci, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175440
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsami.0c17183
- PubMed https://pubmed.ncbi.nlm.nih.gov/33172259
초록/요약
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).
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