Figure 5
From: Strain induced electronic structure variation in methyl-ammonium lead iodide perovskite
(a) Relationship between the VBM shifts ΔVBM and the “least stable” Pb-I bond of CH3NH3PbI3 under various external strains. (b) Relationship between the CBM shifts ΔCBM and |Δ(∠Pb-I-Pb)| of CH3NH3PbI3 under various external strains. ΔVBM and ΔCBM are the difference between the VBM/CBM of the stressed CH3NH3PbI3 and unstressed CH3NH3PbI3. |Δ(∠Pb-I-Pb)| is the absolute of difference between the largest ∠Pb-I-Pb angles of the stressed and unstressed CH3NH3PbI3 systems.
