The role of Cs4PbI6 in stabilizing caesium lead iodide perovskite by Jessica Satta
Metal halide perovskites is a class of crystalline compounds which have garnered great interest in the recent years. Thanks to their intrinsic properties: high absorption coefficients, high photoluminescence quantum yield, high charge-carrier mobilities, band gap tunability, narrow-band emission, they show great prospective in different applications such as lasers, photodetectors, light emitting diodes.
However, most of the recent studies are dedicated to increase their stability and lifetime in real operation conditions. Phase transitions among different polymorphs have been observed depending on temperature, light flux and/or atmospheric stresses (oxygen, moisture and heat).
The high temperature phase is a cubic perovskite, with high efficiency and narrow emission line. Unfortunately, for all the members of the group of caesium lead trihalides perovskites, the cubic phase is metastable at room temperature and spontaneously converts to an orthorhombic phase, characterized by a wide band gap and weak and broad emission.
In order to stabilize the cubic phase in CsPbI3, we studied the synthesis’ conditions of Cs4PbI6 and its role in stabilizing caesium lead iodide perovskite at room temperature.
The seminar will be online due to COVID restrictions.
https://teams.microsoft.com/l/meetup-join/19%3ameeting_NjYwOTRhZTgtM2EwOS00NDg2LWEwMjQtMzI2YmE1MmMyMTQ2%40thread.v2/0?context=%7b%22Tid%22%3a%222f54ab68-83af-4d70-8895-a0d1e95ec899%22%2c%22Oid%22%3a%22be6b543c-6fb5-479c-a18a-873811ce9240%22%2c%22IsBroadcastMeeting%22%3atrue%7d&btype=a&role=a
