文摘
Organic-inorganic hybrid perovskite solar cells have attracted great interest because of rapid improvement of power-conversion efficiency and strong potential for low fabrication cost. The development of cost-effective routes producing high quality perovskite films has been continuously demanded. Here, it is shown that crystalline perovskite films with completely coated morphology can be formed using the precursors of MACl and PbI2 without post-annealing under atmosphere. The dense perovskite films composed of the closely packed islands are observed with the smooth surface. The planar cells with p-i-n heterojunction geometry are successfully demonstrated using PEDOT:PSS and PCBM. Significantly, the outstanding electrical properties are observed, which demonstrates the good coverage and crystallinity of the perovskite layers.