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Open AccessArticle

The Crucial Role of Quaternary Mixtures of Active Layer in Organic Indoor Solar Cells

1
School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
2
Research Center for Photoenergy Harvesting & Conversion Technology (phct), Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Korea
3
ITODYS University Paris Diderot CNRS UMR 7086 (Paris 7), 75013 Paris, France
4
Department of Electrical Engineering, Engineering Research Institute (ERI), Gyeongsang National University, 501 Jinjudaero, Jinju, Gyeongnam 52828, Korea
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(10), 1838; https://doi.org/10.3390/en12101838
Received: 18 March 2019 / Revised: 12 May 2019 / Accepted: 13 May 2019 / Published: 15 May 2019
A bulk heterojunction (BHJ) consisting of more than one donor/acceptor is one plausible way to improve the charge transport and/or the spectral absorption range in organic solar cells. Ternary and quaternary solar cells have shown promise in this regard. However, quaternary structures have not yet been intensively tested under indoor lighting conditions. A finite-difference time-domain (FDTD)-based simulation was used to solve for the electric field intensity distribution inside a quaternary photovoltaic device illuminated by 500 lx indoor white light emitting diodes (LEDs). We found that quaternary indoor photovoltaics (IPVs) showed peculiarly high oscillations in the simulated ideal short-circuit current density (Jsc,ideal). Here, we simulated the electric field intensity inside the photovoltaic, compared it to single BHJ photovoltaics, and deduced that the electric field intensity inside the active layer of the IPV was highly sensitive to its thickness due to interference between the incident light and the light reflecting from the back electrode. We also found that Poly[N-9′-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) acted as the primary light absorber in the quaternary blend while poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PTB7) acted primarily as a cascade energy level and secondarily as a supplementary light absorber. View Full-Text
Keywords: quaternary; organic; finite-difference time-domain; optical modeling; layer thickness optimization quaternary; organic; finite-difference time-domain; optical modeling; layer thickness optimization
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Vincent, P.; Shim, J.W.; Jang, J.; Kang, I.M.; Lang, P.; Bae, J.-H.; Kim, H. The Crucial Role of Quaternary Mixtures of Active Layer in Organic Indoor Solar Cells. Energies 2019, 12, 1838.

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