Study On The Precursor And Ferroelectric Compact Layer For Printable Mesoscopic Perovskite Solar Cells

The efficiency of single-junction perovskite solar cell has exceeded 25.2%,and the efficiency of perovskite/silicon tandem solar cell has reached 29.15%,but its commercialization process is limited by stability and upscaling of the devices.Based on the printable mesoporous perovskite solar cell（P-MPSCs）,which has high stability,low cost,and easy to enlarge the device area,this paper mainly studies the influence of perovskite precursor and ferroelectric material compact layer on the performance of P-MPSCs.The main contents include:The influence of precursor concentration on the morphology of halide perovskite and the performance of P-MPSCs was investigated.It is found that the precursor with low concentration of 0.24 M has larger crystal particles but poor filling in the mesoporous layer,while the precursor with high concentration of 1.20 M has smaller crystal particles but better filling in the mesoporous layer.The difference of device performance between different concentrations is mainly reflected in the short-circuit current density and filling factor,which is the result of the comprehensive influence of crystallization quality and filling quality.After optimization,P-MPSCs devices based on 0.70 M precursors achieved the best efficiency of 16.3%,and the hysteresis was small.The effects of concentration,solvent and aging on（5-AVA）_x（MA）_1-xPb I₃precursor were investigated.In the 20 day aging process,1.20 M high concentration precursor colloidal particles will gradually grow up to produce a large number of precipitates,the colloidal properties of 0.70 M precursor are relatively stable,and the size of some particles in 0.24 M low concentration precursor is gradually approaching that of 0.70 M precursor.In the process of fast crystallization in antisolvent,the colloidal particles and the real solution in the precursor nucleate respectively,which determines the morphology of the films.For the（5-AVA）_x（MA）_1-xPb I₃ precursor with different solvents of 0.70 M,the distribution of colloidal particles is affected by the solvents,DMF（5μm）>DMF+DMSO（0.35μm）>GBL（0.27μm）>GBL+DMSO（7nm）,and the size of the precursor colloidal particles of DMF and GBL+DMSO will increase during the aging process;the solvent affects the binding form of the precursor colloidal particles,thus affecting the micro morphology of the prepared films.The application of lead titanate（PbTiO₃,PTO）as a compact layer in P-MPSCs was investigated.With FTO as the test background,the light transmittance of PTO/FTO substrate is 99.99%.The residual polarization and coercive field of the prepared PTO films are P_r=4.11μC/cm²,-P_r=-5.59μC/cm²,E=34.33 k V/cm and-E=29.18 k V/cm,respectively.The P-MPSCs based on the PTO compact layer have been optimized to achieve an efficiency of 13.72%.For P-MPSCs based on PTO compact layer,voltage polarization has an effect on the device performance before filling the perovskite.