Ligand?Free MAPbI ₃ Quantum Dot Solar Cells Based on Nanostructured Insulating Matrices

The stability, either chemical or thermal, and performance of colloidal quantum dot (CQD) devices are typically limited by the presence surface-bonded organic ligands required to stabilize nanocrystals. In addition, optimization charge transport implies lengthy ligand exchange processing. Herein, evidence efficient through a network ligand-free perovskite dots (PQDs) embedded in an insulating porous matrix made monodisperse SiO2 nanoparticles is shown. Methylammonium lead iodide (CH3NH3PbI3 MAPbI3) QDs prepared situ infiltration precursors within pores, which act both as nanoreactors for synthetic reaction supporting scaffolds, hence reducing number postprocessing steps usually CQD solar cells. Above certain nanocrystal load, percolation reached dot-to-dot achieved without compromising confinement effects. Solar cells based on MAPbI3 this way present 9.3% efficiency, highest reported scaffold-supported PQD cell, significantly improved stability under illumination with respect their bulk counterparts. Therefore, adequately designed networks PQDs can be used light harvesters photocarrier conductors, alternative configuration that previously developed QD