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• W2054998401 abstract "In this work we measure the exciton diffusion length (L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> ) of the electron donor material boron subphthalocyanine chloride (SubPc) as a function of concentration in a wide energy gap host material, effectively modulating the intermolecular separation. It is shown that the L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> of neat SubPc (L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> = 10.7 nm) can be increased by ~50% at a concentration of 25 wt.% (L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> = 15.4 nm). The enhancement in L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> is attributed to the optimization of the parameters that control Förster energy transfer. Furthermore, we show that enhanced L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> can be translated to dilute donor OPVs that demonstrate an enhanced power efficiency of η <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>P</sub> = 4.4%, a ~30% increase relative to OPV devices based on neat SubPc and rivaling the efficiency of corresponding bulk heterojunction devices based on SubPc and C <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>60</sub> . Kinetic Monte Carlo modeling of exciton dynamics in these devices suggests that optimal incorporation of dilute donor layers with enhanced L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> depends intimately on the interface. Specifically, an imbalance in energy transfer across the dilute donor interface imparts inhomogeneity in the energy transfer landscape, dramatically affecting exciton motion. Overall, this work highlights the opportunity for designing future organic semiconductors that have longer L <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>D</sub> as well as OPV architectures that are directly optimized for enhanced exciton diffusion." @default.
• W2054998401 created "2016-06-24" @default.
• W2054998401 creator A5061466865 @default.
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• W2054998401 date "2014-06-01" @default.
• W2054998401 modified "2023-09-26" @default.
• W2054998401 title "Enhancing exciton diffusion in organic photovoltaics cells incorporating dilute donor layers" @default.
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• W2054998401 doi "https://doi.org/10.1109/pvsc.2014.6925157" @default.
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