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Article Dans Une Revue ACS Applied Materials & Interfaces Année : 2015

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

Résumé

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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Dates et versions

hal-01280383 , version 1 (29-02-2016)

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Citer

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, 2015, 7 (45), pp.25334-25340. ⟨10.1021/acsami.5b06475⟩. ⟨hal-01280383⟩
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