Ultrasonically sprayed-on perovskite solar cells-effects of organic cation on defect formation of CH3NH3PbI3 films

Impact of a Spun-Cast MoOx Layer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells

“…The effects can be quantified by examining the steepness of the absorption edge. More details on determining the E u value can be found elsewhere . The amount of “ x ” in MoO x affected the Urbach energy of the perovskites (see Figure S5b).…”

“…The peak becomes much more intense after 60 days (orange line). It is important to note that another complex of dihydrate (CH 3 NH 3 ) 4 PbI 6 ·2H 2 O species having XRD peaks at 2θ ∼ 11.3, 11.4, and 11.5° can be formed when the perovskite absorbs more water molecules from moisture ambiance. , The sample begins to reveal the reflection peak of δ-CsPbI 3 (as marked by “ε”) when the exposure time is increased to 60 days. We emphasize here that there was no appearance or evolution of the unstable yellow phase of δ-FAPbI 3 or the PbI 2 phase for perovskite in contact with MoO x upon moisture exposure time.…”

“…More details on determining the E u value can be found elsewhere. 38 The amount of "x" in MoO x affected the Urbach energy of the perovskites (see Figure S5b). The calculated value of E u is approximately 70 meV for bare perovskite.…”