Hindered Phase Transition Kinetics of α‐CsPbI₃ by External Tension

Abstract

Recently, the all‐inorganic perovskite solar cells have attracted large amount of attention, due to the much better water resistance compared to the organic counterparts. Unfortunately, the undesired phase transition remained a significant challenge, despite the many attempts. An important step forward has been made here by numerical simulation, which discovered the significance of external strain to the stability of desired α‐CsPbI3, whose lifetime can be extended up to 3 times by non‐hydrostatic tension, as has been verified by both modelling and experimental results. In addition, such lifetime could be even enhanced further by hydrostatic tension, as indicated by the simulation. The unexpected observation provided not only an effective method to extend the lifetime of the perovskite devices, but also opened an unexpected path for the wide research community to utilise the straining engineering method that has been extensively investigated in the perovskite research.This article is protected by copyright. All rights reserved.

Controlled formation of ball-milled carbon quantum dots via optimized graphite structures by numerical simulation

“…. [26][27][28][29] When the absolute value of P reaches 1, the vdW bond is broken, and the graphite is exfoliated. The P value for this specific site ceases to change, whose color was also set as blue and green for P = 1 and À1, respectively.…”

“…25 As the strain propagates, the P values at all sites could thus be determined by including the additional term of . 26–29 When the absolute value of P reaches 1, the vdW bond is broken, and the graphite is exfoliated. The P value for this specific site ceases to change, whose color was also set as blue and green for P = 1 and −1, respectively.…”