Resumen de Stability improvement of CH_(3)NH_(3)PbI_(3) hybrid perovskite through tin and chlorine doping (5 pages)
B. Aguilar, T.E. Soto, K. Sánchez, O. Navarro, A. Valdespino, D.Y. Torres Martínez
In recent years, the hybrid perovskite CH_(3)NH_(3)PbI_(3) has been widely studied because of its potential application in the fabrication of high efficiency solar cells. The main challenge is to avoid destabilization of this compound under working conditions. Indeed, the MAPbI_(3) begins to decompose into the precursor phases, a few hours or days after being formed. We reported a stability monitoring of doped compounds CH_(3)NH_(3)Pb_(0.9)Sn_(0.1)I_(2.8)Cl_(0.2) and CH_(3)NH_(3)Pb_(0.75) Sn_(0.25)I_(2.5)Cl_(0.5) obtained as films from solutions of the precursors in N-N dimethylformamide on chemically treated glass substrates. The monitoring was carried out using X-Ray diffraction and absorbance measurements in the UV-Vis region. The tetragonal symmetry initially determined for the three compounds, remains almost unaltered for CH_(3)NH_(3)Pb_(0.75) Sn_(0.25)I_(2.5)Cl_(0.5) even after 600 days, under environmental conditions. The bandgap value for this doped perovskite is 1.44 eV.
