Correlation between Electronic Defect States Distribution and Device Performance of Perovskite Solar Cells.

ABSTRACT: In the present study, random current fluctuations measured at different temperatures and for different illumination levels are used to understand the charge carrier kinetics in methylammonium lead iodide CH₃NH₃PbI₃-based perovskite solar cells. A model, combining trapping/detrapping, recombination mechanisms, and electron-phonon scattering, is formulated evidencing how the presence of shallow and deeper band tail states influences the solar cell recombination losses. At low temperatures, the observed cascade capture process indicates that the trapping of the charge carriers by shallow defects is phonon assisted directly followed by their recombination. By increasing the temperature, a phase modification of the CH₃NH₃PbI₃ abs

SUBMITTER: Landi G 

PROVIDER: S-EPMC5644241 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature