Ms. Hyojeong Choi Profile

Hyojeong Choi

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Proceedings Article | 3 October 2022 Presentation

Large-area organic photovoltaics for indoor light source

Hyojeong Choi, Hyeok Kim, Yongju lee, Swarup Biswas, Hyeongwon Lee

Proceedings Volume 12209, 1220908 (2022) https://doi.org/10.1117/12.2653664

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In this presentation, we propose a large-area solution-treated OPV module using a fullerene material in which the absorption spectrum of a photoactive material is almost similar to that of an LED light source used indoors. The output of the device through the series connection of the large area device and the voltage/current changed by the 1000~3000 lx LED light source and the application field are covered.

Proceedings Article | 30 September 2022 Poster + Paper

Self-powered near-infrared organic photodiode with functional interlayer

Yongju Lee, Hyowon Jang, Hyojeong Choi, Biswas Swarup, Hyeok Kim

Proceedings Volume 12234, 122340G (2022) https://doi.org/10.1117/12.2653662

KEYWORDS: Photodiodes, Transmittance, Electrons, Solar energy, Light emitting diodes, Organic photovoltaics, Ultraviolet radiation, Surface roughness, Photovoltaics, Infrared radiation

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The electromagnetic spectrum consists of ultraviolet (100-400 nm), visible (400-750 nm), and infrared (750-2500 nm) regions, among others. The visible region contains the wavelengths that can be seen by the human eye, and infrared light is outside the red edge of this band when the light emitted from any source or heating element is spectrally dispersed. In the infrared band, the electromagnetic waves with the shortest wavelength are referred to as near-infrared rays (750-1000 nm). An organic photovoltaic capable of generating light in the near-infrared wavelength band was fabricated herein through bandgap matching of the photoactive polymer for sensing in the near-infrared region. In addition, the organic photovoltaic was optimized through a newly synthesized functional intermediate layer; this layer constitutes a hole-transport layer that transfers the holes generated by the photoactive layer to the cathode easily. The material traditionally used for the hole-transport layer is PEDOT:PSS, which has the advantages of excellent heat resistance as well as high electrical conductivity and transparency. However, PEDOT:PSS also has drawbacks, such as cost inefficiency, strong acidity, and high hydrophilicity. We have synthesized a polypyrrole polystyrene sulfonate (PPY:PSS) as a hole-transport material that overcomes these disadvantages and optimized it by adjusting the ratio of PPY to PSS. Next, poly[4,8- bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4- b]thiophene-)-(2-carboxylate-2-6-diyl)]:phenyl‐C70‐butyric acid methyl ester (PTB7-th:PC70BM) active-layer-based organic photovoltaic was fabricated. Thus, an organic photodiode capable of sensing more effectively in the near-infrared region was developed by inserting the functional interlayer.

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