A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4(CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in...A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4(CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage(V(oc)) and fill factor(F F). In addition, up to 10.45% power conversion efficiency(PCE) has been achieved.No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction(XRD) pattern, Raman spectrum, ultraviolet-visible(UV-Vis), and TOF-SIMS.Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.展开更多
The origin of anomalous luminescence efficiency enhancement of short-term aged GaN-based blue light-emitting diodes was studied. We found that the intensity of the electroluminescence and photoluminescence spectra wer...The origin of anomalous luminescence efficiency enhancement of short-term aged GaN-based blue light-emitting diodes was studied. We found that the intensity of the electroluminescence and photoluminescence spectra were both increased in the very beginning period of aging. With the help of a rate-equation model, we concluded that this kind of luminescence efficiency enhancement is a joint effect of the defect reduction in active layers and the changes out of active layers, for example the Mg acceptor annealing.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.91733301,51761145042,91433205,11474333,51421002,51627803,and51572288) the International Partnership Program of the Chinese Academy of Sciences(Grant No.112111KYSB20170089)
文摘A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4(CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage(V(oc)) and fill factor(F F). In addition, up to 10.45% power conversion efficiency(PCE) has been achieved.No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction(XRD) pattern, Raman spectrum, ultraviolet-visible(UV-Vis), and TOF-SIMS.Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.
文摘The origin of anomalous luminescence efficiency enhancement of short-term aged GaN-based blue light-emitting diodes was studied. We found that the intensity of the electroluminescence and photoluminescence spectra were both increased in the very beginning period of aging. With the help of a rate-equation model, we concluded that this kind of luminescence efficiency enhancement is a joint effect of the defect reduction in active layers and the changes out of active layers, for example the Mg acceptor annealing.