= Br, I) with the quantum confinement effect have been fabricated by a convenient self-assembly
method. … In this work, we have successfully fabricated the ultra-thin films of the two-dimensional
layered perovskites [NH 3 RNH 3 ]PbX 4 by the self-assembly method. The organic–inorganic
perovskite films are uniform and smooth, and the thickness can be controlled at the nano-meter
level. Moreover, they exhibit strong absorption and photoluminescence resulting from stable …