Inorganic cesium lead halide perovskites have gained increasing attention to boost photovoltaic performance and device stability.Nevertheless,the photoactive to photo-inactive phase transition under ambient conditions...Inorganic cesium lead halide perovskites have gained increasing attention to boost photovoltaic performance and device stability.Nevertheless,the photoactive to photo-inactive phase transition under ambient conditions hampers its further enhancement.Here,we varied various amounts of propylammonium bromide(PABr)additive in the CsPbI_(2)Br perovskite and further varied the erbium(ErCl_(3))-doped CsPbI_(2)Br(herein CsPb1-nErnI_(2)BrXn)(where X=Cl;0≤n<1)perovskite.Further,in the optimized(CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09))composition,we studied the influence of various amounts of the PABr additive.Our results clearly show the PABr additive added film results in high-quality surface morphology,high crystallinity,and decreased trap-state density.Accordingly,our champion CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09)+2 mg ml^(-1) PABr(CsEr-PA)-based inorganic perovskite solar cell(IPVSC)device showed 16.74%power conversion efficiency(PCE),which is much higher than that of bare(13.20%)and CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09)-based perovskite devices(15.73%).In addition,the CsEr-PA-based IPVSC device revealed increased long-term stability,which maintained 90%of its initial PCE at 65℃ and thermal stress of over 400 h under ambient conditions.These dual stabilization strategies cover a new way to increase the photovoltaic performance of IPVSCs.展开更多
基金supported by Priority Research Centre Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Education,Science,and Technology(NRF-2018R1A6A1A03024334)and(2020R1A2C2004880).
文摘Inorganic cesium lead halide perovskites have gained increasing attention to boost photovoltaic performance and device stability.Nevertheless,the photoactive to photo-inactive phase transition under ambient conditions hampers its further enhancement.Here,we varied various amounts of propylammonium bromide(PABr)additive in the CsPbI_(2)Br perovskite and further varied the erbium(ErCl_(3))-doped CsPbI_(2)Br(herein CsPb1-nErnI_(2)BrXn)(where X=Cl;0≤n<1)perovskite.Further,in the optimized(CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09))composition,we studied the influence of various amounts of the PABr additive.Our results clearly show the PABr additive added film results in high-quality surface morphology,high crystallinity,and decreased trap-state density.Accordingly,our champion CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09)+2 mg ml^(-1) PABr(CsEr-PA)-based inorganic perovskite solar cell(IPVSC)device showed 16.74%power conversion efficiency(PCE),which is much higher than that of bare(13.20%)and CsPb_(0.97)Er_(0.03)I_(2)BrCl_(0.09)-based perovskite devices(15.73%).In addition,the CsEr-PA-based IPVSC device revealed increased long-term stability,which maintained 90%of its initial PCE at 65℃ and thermal stress of over 400 h under ambient conditions.These dual stabilization strategies cover a new way to increase the photovoltaic performance of IPVSCs.
