Reduction in the Interfacial Trap Density of Mechanochemically Synthesized MAPbI₃

Abstract

Organo-lead halide perovskites have emerged as a promising light harvesting materials for solar cells.The ability to prepare high quality films with a low concentration of defects is essential for obtaining high device performance. Here, we advance the procedure for the fabrication of efficient perovskite solar cells (PSCs) based on mechanochemically synthesized MAPbI 3 . The use of mechano-perovskite for the thin film formation provides a high degree of control of the stoichiometry and allows for the growth of relatively large crystalline grains. The best device achieved a maximum PCE of 17.5% from a current-voltage scan (J-V), which stabilized at 16.8% after 60 sec of maximum power point tracking.Strikingly, PSCs based on MAPbI 3 mechanoperovskite exhibit lower "hysteretic" behaviour in comparison to that comprising MAPbI 3 obtained from the conventional solvothermal reaction between PbI 2 and MAI. To gain a better understanding of the difference in J-V hysteresis we analyze the charge/ion accumulation mechanism and identify the defect energy distribution in the resulting MAPbI 3 based devices. These results indicate that the use of mechanochemically synthesized perovskites provides a promising strategy for the formation of crystalline film demonstrating slow charge recombination and low trap density.

Dry Mechanochemical Synthesis of Highly Luminescent, Blue and Green Hybrid Perovskite Solids

“…It is a simple method which can lead to higher purity due to the absence of processing additives and solvents. [21][22][23][24][25][26][27][28] Mechanochemical synthesis can be used to synthesize multicomponent compounds simply by mixing the chemical precursors in the appropriate stoichiometry. Impor-www.advopticalmat.de mixed accordingly to the targeted compound's stoichiometry MA 0.8 Cs 0.2 Pb(Br 0.6 Cl 0.4 ) 3 inside a nitrogen-filled glove box and introduced in a 10 mL zirconia ball-mill jar together with zirconia beads.…”

“…Solvent‐free “dry” mechanochemical synthesis is an alternative technique to prepare perovskites with virtually any composition. It is a simple method which can lead to higher purity due to the absence of processing additives and solvents . Mechanochemical synthesis can be used to synthesize multicomponent compounds simply by mixing the chemical precursors in the appropriate stoichiometry.…”

Development of an SBU‐Based Mechanochemical Approach for Drug‐Loaded MOFs

“…20 wt.‐% at room temperature, while the protein molecules of cytochrome c were majorly embedded on the surface region of ZIF‐8 and the synthesized protein/ZIF‐8 composite displays high biological activities . Notably, there is a lack of reports on solid‐solid ball milling reactions to the encapsulation of drug molecules into a MOF framework,, despite the fact that mechanochemistry have appeared as a successful tool for the preparation of molecular cages, hybrid perovskites for optoelectronic applications, MOFs as well as encapsulation of inorganic nanoparticles, dyes or enzymes in MOF matrices.…”

CH3NH3PbI3 and HC(NH2)2PbI3 Powders Synthesized from Low‐Grade PbI2: Single Precursor for High‐Efficiency Perovskite Solar Cells

“…[33][34][35][36] Mechanically prepared polycrystallineM APbI 3 powder was used as ap recursor, and it showedp hase purity andareverse-scanned PCE of 17.5 %. [33][34][35][36] Mechanically prepared polycrystallineM APbI 3 powder was used as ap recursor, and it showedp hase purity andareverse-scanned PCE of 17.5 %.…”

“…Recently,p owdered perovskites were proposeda sp recursors, and the perovskite powders were prepared by am echanochemical or wet chemistry method. [33][34][35][36] Mechanically prepared polycrystallineM APbI 3 powder was used as ap recursor, and it showedp hase purity andareverse-scanned PCE of 17.5 %. [33] For the solution-based wet method,l arge-grained MAPbI 3 (MA = methylammonium) films were obtained from a single-crystalline perovskite powder precursor.…”