420 nm thick <inline-formula> <img src="cpb_27_1_018804_ieqn1.gif"/> </inline-formula> capping layers for efficient TiO<sub>2</sub> nanorod array perovskite solar cells

420 nm thick

capping layers for efficient TiO₂ nanorod array perovskite solar cells

Li Long, Shi Cheng-Wu^†, Deng Xin-Lian, Wang Yan-Qing, Xiao Guan-Nan, Ni Ling-Ling

TiO₂ nanorod array: (a) surface SEM image, (b) cross-sectional SEM image, (c) XRD pattern, (d) UV–Vis absorption spectrum.