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Lanthanum Hexaboride As Novel Interlayer for Improving the Thermal Stability of P3HT:PCBM Organic Solar Cells

Sylvain Chambon 1 Yolande Murat 1 Guillaume Wantz 1 Lionel Hirsch 1 Pascal Tardy 1
1 ELORGA
IMS - Laboratoire de l'intégration, du matériau au système : UMR 5218
Abstract : For efficient organic photovoltaic (OPV) solar cells, a low work function electrode is necessary to enhance the built-in voltage of the active layer, thereby improving the overall efficiency. Calcium is often used for this purpose in the laboratory; however, its development on a larger scale is impaired by its high reactivity with oxygen and water and the resulting low stability of solar cells under operation. The influence of a novel interlayer, lanthanum hexaboride (LaB6), on the electronic properties of OPV is studied in this work. Similarly to calcium, when LaB6 is used as an interlayer, it enhances the built-in voltage in the device, leading to a higher fill factor (FF) and optimal open circuit voltage (Voc). As a result, optimized LaB6-based devices present significantly improved power conversion efficiencies. More importantly, while calcium/aluminum (Ca/Al) and aluminum (Al) cathodes lose their capacity to enhance the internal electrical field during thermal aging, the LaB6/aluminum (LaB6/Al) electrode remains stable. This remarkable effect results in a highly stable Voc and flat-band potential during aging.
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https://hal.archives-ouvertes.fr/hal-01280383
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Submitted on : Monday, February 29, 2016 - 2:56:28 PM
Last modification on : Wednesday, November 17, 2021 - 9:48:04 AM

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Sylvain Chambon, Yolande Murat, Guillaume Wantz, Lionel Hirsch, Pascal Tardy. Lanthanum Hexaboride As Novel Interlayer for Improving the Thermal Stability of P3HT:PCBM Organic Solar Cells. ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2015, 7 (45), pp.25334-25340. ⟨10.1021/acsami.5b06475⟩. ⟨hal-01280383⟩

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