Improvement of electron injection of organic light-emitting devices by inserting a thin aluminum layer into cesium carbonate injection layer*
Xin Li-Wena),b),c), Wu Xiao-Minga),b),c)†, Hua Yu-Lina),b),c)‡, Xiao Zhi-Huia),b),c), Wang Lia),b),c), Zhang Xina),b),c), Yin Shou-Gena),b),c)
       
Curves of photovoltaic measurements of device I, device II, device A (0.4 nm), device B (0.8 nm), device C (1.2 nm), and device D (1.6 nm).