Thermal stability of CH3NH3PbIxCl3-x versus [HC(NH2)(2)](0.83)Cs0.17PbI2.7Br0.3 perovskite films by X-ray photoelectron spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10422920" target="_blank" >RIV/00216208:11320/20:10422920 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=PQMofmY96D" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=PQMofmY96D</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apsusc.2020.145596" target="_blank" >10.1016/j.apsusc.2020.145596</a>

Result language
angličtina
Original language name
Thermal stability of CH3NH3PbIxCl3-x versus [HC(NH2)(2)](0.83)Cs0.17PbI2.7Br0.3 perovskite films by X-ray photoelectron spectroscopy
Original language description
The thermal stability of CH3NH3PbIxCl3-x and [HC(NH2)(2)](0.83)Cs0.17PbI2.7Br0.3 perovskite films was studied insitu by X-ray photoelectron spectroscopy. It was found that below 85 degrees C both of them are relatively stable. After annealing above 85 degrees C, we observe a clear perovskite surface decomposition, i.e., a release of organic cations and creation of "metallic lead". The mixed cation lead mixed halide perovskite, however, decomposes at a much lower rate. For both perovskite films, the metallic to the total lead ratio changes with the same rate for the same annealing temperatures. The release of A-site cations from the ABX(3) crystal structure of perovskite and/or creation of "metallic lead" causes also a small shift of the valence band maximum towards the Fermi level. The release of [HC(NH2)(2)] (+/-) or Cs (+/-) is not as significant as the release of CH3NH3 +/- ; therefore, it may explain why [HC(NH2)(2)](0.83)Cs0.17PbI2.7Br0.3 solar cells are thermally more stable. Therefore, as the stability of CH3NH3 PbIxCl3-x is same as the stability of [HC(NH2)(2)](0.83)Cs0.17PbI2.7Br0.3 below 85 degrees C, there must be more severe degradation pathways that are currently underappreciated on the solar cell level.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/LM2018116" target="_blank" >LM2018116: Surface Physics Laboratory - Materials Science Beamline</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)