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

详细信息    查看全文

• 作者：Sylvain Chambon ; Yolande Murat ; Guillaume Wantz ; Lionel Hirsch ; Pascal Tardy
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 18, 2015
• 年：2015
• 卷：7
• 期：45
• 页码：25334-25340
• 全文大小：466K
• ISSN：1944-8252

文摘

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 (V_oc). 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 V_oc and flat-band potential during aging.