TY - JOUR
T1 - Thermodynamics of cesium lead halide (CsPbX3, x= I, Br, Cl) perovskites
AU - Wang, Bin
AU - Navrotsky, Alexandra
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/1
Y1 - 2021/1
N2 - Inorganic cesium lead halide (CsPbX3, X = I, Br, Cl) perovskites have sparked broad interest for photovoltaic applications, which, however, may be plagued by chemical and thermodynamic instabilities. This work reports calorimetric studies on the formation enthalpies of CsPbX3 perovskites, confirming decreasing thermodynamic stability in the order CsPbCl3, CsPbBr3 and CsPbI3. Cesium lead iodide (CsPbI3), one of the most studied inorganic lead halide perovskites, is shown to be only barely stable from a thermodynamic perspective. This order of increasing instability is consistent with the variation of Goldschmidt tolerance factor. The perovskites are high temperature entropy-stabilized phases with respect to low temperature polymorphs, with the thermodynamics of phase transitions reflecting the above thermodynamic trends.
AB - Inorganic cesium lead halide (CsPbX3, X = I, Br, Cl) perovskites have sparked broad interest for photovoltaic applications, which, however, may be plagued by chemical and thermodynamic instabilities. This work reports calorimetric studies on the formation enthalpies of CsPbX3 perovskites, confirming decreasing thermodynamic stability in the order CsPbCl3, CsPbBr3 and CsPbI3. Cesium lead iodide (CsPbI3), one of the most studied inorganic lead halide perovskites, is shown to be only barely stable from a thermodynamic perspective. This order of increasing instability is consistent with the variation of Goldschmidt tolerance factor. The perovskites are high temperature entropy-stabilized phases with respect to low temperature polymorphs, with the thermodynamics of phase transitions reflecting the above thermodynamic trends.
KW - Calorimetry
KW - Cesium lead halide
KW - Perovskites
KW - Thermodynamics
UR - http://www.scopus.com/inward/record.url?scp=85097345478&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85097345478&partnerID=8YFLogxK
U2 - 10.1016/j.tca.2020.178813
DO - 10.1016/j.tca.2020.178813
M3 - Article
AN - SCOPUS:85097345478
SN - 0040-6031
VL - 695
JO - Thermochimica Acta
JF - Thermochimica Acta
M1 - 178813
ER -