Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the devices.Here,we proposed time-resolved photolumine...Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the devices.Here,we proposed time-resolved photoluminescence(TRPL)as a nondestructive method to assess trap density.A model was constructed to investigate carrier recombination and transition in perovskite materials.The model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite materials.Furthermore,a genetic algorithm was employed to optimize the parameters.Finally,statistical methods were applied to obtain the parameters associated with the trap states of the material.This approach facilitates the successful determination of trap densities for different samples with clear differentiation.展开更多
Lead halide perovskite microlasers have shown impressive performance in the green and red wavebands.However,there has been limited progress in achieving blue-emitting perovskite microlasers.Here,blue-emitting perovski...Lead halide perovskite microlasers have shown impressive performance in the green and red wavebands.However,there has been limited progress in achieving blue-emitting perovskite microlasers.Here,blue-emitting perovskitephase rubidium lead bromide(RbPbBr_(3))microcubes were successfully prepared by using a one-step chemical vapor deposition process,which can be utilized to construct optically pumped whispering gallery mode microlasers.By regulating the growth temperature,we found that a high-temperature environment can facilitate the formation of the perovskite phase and microcubic morphology of RbPbBr_3.Notably,blue single-mode lasing in a RbPbBr_3microcubic cavity with a narrow linewidth of 0.21 nm and a high-quality factor(2200)was achieved.The obtained lasing from RbPbBr_3microlasers also exhibited an excellent polarization state factor(0.77).By modulating the mixed-monovalent cation composition,the wavelength of the microlaser could be tuned from green(536 nm)to pure blue(468 nm).Additionally,the heat stability of the mix-cation perovskite was better than that of conventional CsPbBr_(3).The stable and high-performance blue single-mode microlasers may thus facilitate the application of perovskite lasers in blue laser fields.展开更多
基金supported by the National Natural Science Foundation of China(Nos.62104234 and 52103279)the Shanghai Sailing Program(No.21YF1454000)。
文摘Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the devices.Here,we proposed time-resolved photoluminescence(TRPL)as a nondestructive method to assess trap density.A model was constructed to investigate carrier recombination and transition in perovskite materials.The model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite materials.Furthermore,a genetic algorithm was employed to optimize the parameters.Finally,statistical methods were applied to obtain the parameters associated with the trap states of the material.This approach facilitates the successful determination of trap densities for different samples with clear differentiation.
基金National Natural Science Foundation of China(61675219,61875256)Natural Science Foundation of Shanghai(20JC1414605)。
文摘Lead halide perovskite microlasers have shown impressive performance in the green and red wavebands.However,there has been limited progress in achieving blue-emitting perovskite microlasers.Here,blue-emitting perovskitephase rubidium lead bromide(RbPbBr_(3))microcubes were successfully prepared by using a one-step chemical vapor deposition process,which can be utilized to construct optically pumped whispering gallery mode microlasers.By regulating the growth temperature,we found that a high-temperature environment can facilitate the formation of the perovskite phase and microcubic morphology of RbPbBr_3.Notably,blue single-mode lasing in a RbPbBr_3microcubic cavity with a narrow linewidth of 0.21 nm and a high-quality factor(2200)was achieved.The obtained lasing from RbPbBr_3microlasers also exhibited an excellent polarization state factor(0.77).By modulating the mixed-monovalent cation composition,the wavelength of the microlaser could be tuned from green(536 nm)to pure blue(468 nm).Additionally,the heat stability of the mix-cation perovskite was better than that of conventional CsPbBr_(3).The stable and high-performance blue single-mode microlasers may thus facilitate the application of perovskite lasers in blue laser fields.
