17 October 2007 Integrated organic photovoltaic modules
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Methods for scalable output voltage and encapsulation of organic photovoltaic cells are addressed in this paper. To obtain scalable output voltages, integrated photovoltaic modules comprised of a bulk heterojunction of poly(3- hexylthiophene) (P3HT) and a soluble C70 derivative, [6,6]-phenyl C71 butyric acid methyl ester (PCBM-70), were fabricated. Power conversion efficiency of individual P3HT/PCBM-70 cells was estimated to be 4.1 % for AM1.5 G illumination. Modules of one to four cells connected in series produced open-circuit voltages VOC that linearly depend on the number of cells N as VOC = N × 0.621 V with a nearly constant short-circuit current of 1.4 ± 0.1 mA. Separately, shelf lifetimes of more than one year were achieved for pentacene/C60 solar cells by encapsulation with a 200-nm-thick layer of Al2O3 deposited by atomic layer deposition (ALD). In addition, the ALD process improved the open-circuit voltage and power conversion efficiency of the solar cells by thermal annealing that occurs during the process.
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William J. Potscavage, William J. Potscavage, Seunghyup Yoo, Seunghyup Yoo, Benoit Domercq, Benoit Domercq, Jungbae Kim, Jungbae Kim, Joe Holt, Joe Holt, Bernard Kippelen, Bernard Kippelen, } "Integrated organic photovoltaic modules", Proc. SPIE 6656, Organic Photovoltaics VIII, 66560R (17 October 2007); doi: 10.1117/12.735320; https://doi.org/10.1117/12.735320

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