The effects of polysodium p-styrene sulfonate(PSS)on wide-bandgap perovskite films and devices are studied in this paper.The research of this paper shows that use of a polypodium PSS passivator can effectively improve the morphology,increase the crystallinity,and reduce the defect density of perovskite films,which are beneficial to inhibit the phase segregation of mixed-halide wide-bandgap perovskite films.Finally,the J-V test results show that the performance of the optimized wide-bandgap perovskite solar cell is significantly improved.In the wide bandgap perovskite solar cell with PSS,the open circuit voltage is up to 1.23 V,and the efficiency is up to 20.54%.Moreover,the stability of the encapsulated device is significantly improved after phase segregation being inhibited,and the efficiency remains 81.9%of the initial efficiency under continuous illumination for 500 h(N2 environment,40℃).
perovskite solar cellswide-band gapcrystallinitydefect passivationphase segregationperformance
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