So far,it's been widely acknowledged that the PbI2 decomposition under illumination mainly accounts for the degradation of perovskite solar cells(PSCs)under maximum power point(MPP)tracking condition.However,PSCs without excess Pbl2 were also reported to deteriorate rapidly under the same condition.Here,we demonstrate that the key to enhance PSCs stability under MPP tracking condition is not to have fascinating surface morphology with effective suppression of nonradiative recombination traps but to prevent the migration of iodine ion(I-)under light illumination.By partially substituting methylammo-nium chloride(MACl)with methylammonium iodide(MAI)and simutaneouly introducing I2 during the sequential deposition,the iodine vacancies in perovskite films are substantially suppressed,thereby lim-iting the pathways for I-migration.As a consequence,PSCs with efficiency of 24.28％are fabricated with remarkably enhanced working stability.

Feihong Ye;Haibing Wang;Weijun Ke;Chen Tao;Guojia Fang

School of Physics and Technology,Wuhan University,Wuhan 430000,Hubei,China

能源化学

[1]Feihong Ye;Haibing Wang;Weijun Ke;Chen Tao;Guojia Fang-.Unveiling the key factor affecting the illumination deterioration and response measures for lead halide perovskite solar cells)[J].能源化学,2022(10):429-435

Pbl2,methylammo,MACl,simutaneouly

Unveiling,key,affecting,illumination,deterioration,response,measures,lead,halide,perovskite,solar,cells,So,far,been,widely,acknowledged,that,PbI2,decomposition,under,mainly,accounts,degradation,PSCs,maximum,power,point,MPP,tracking,condition,However,without,excess,were,also,reported,deteriorate,rapidly,same,Here,demonstrate,stability,is,not,have,fascinating,surface,morphology,effective,suppression,nonradiative,recombination,traps,but,prevent,migration,iodine,light,By,partially,substituting,chloride,methylammonium,iodide,MAI,introducing,during,sequential,deposition,vacancies,films,are,substantially,suppressed,thereby,lim,iting,pathways,consequence,efficiency,fabricated,remarkably,enhanced,working

0.633915