A GaAs/GaAlAs transmission photocathode surface topography is examined with a scanning electron microscope(SEM) in the secondary emission mode.The contributions of photocathode surface topography to mean transverse en...A GaAs/GaAlAs transmission photocathode surface topography is examined with a scanning electron microscope(SEM) in the secondary emission mode.The contributions of photocathode surface topography to mean transverse energy of electrons emitted from the photocathode are calculated. Measurement is made of the variation of mean transverse emission energy with activating time during the course of activation. It is shown that the scattering of the photoelectrons in the Cs/O layer is the primary cause of the unexpectant high values of the mean transverse energy of electrons emitted from GaAs/GaAlAs photocathode. A method is proposed for the reduction of the mean transverse energy of electrons emitted from the photocathode.展开更多
A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absor...A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absorber.The device with PCBDANI single CBL exhibited significantly improved performance with a power conversion efficiency(PCE)of 15.45%,which is approximately17%higher than that of the control device without the CBL.The dramatic improvement in PCE can be attributed to the formation of an interfacial dipole at the PCBM/Al interface originating from the amine functional group and the suppression of interfacial recombinationby the PCBDANI interlayer.To further improve the PCE of pero-SCs,PCBDANI/LiF double CBLs were introduced between PCBM and the top Al electrode.An impressive PCE of 15.71%was achieved,which is somewhat higher than that of the devices with LiF or PCBDANI single CBL.Besides the PCE,the long-term stability of the device with PCBDANI/LiF double CBLs is also superior to that of the device with LiF single CBL.展开更多
文摘A GaAs/GaAlAs transmission photocathode surface topography is examined with a scanning electron microscope(SEM) in the secondary emission mode.The contributions of photocathode surface topography to mean transverse energy of electrons emitted from the photocathode are calculated. Measurement is made of the variation of mean transverse emission energy with activating time during the course of activation. It is shown that the scattering of the photoelectrons in the Cs/O layer is the primary cause of the unexpectant high values of the mean transverse energy of electrons emitted from GaAs/GaAlAs photocathode. A method is proposed for the reduction of the mean transverse energy of electrons emitted from the photocathode.
基金the National Natural Science Foundation of China(21204054,51303118,91333204)the Natural Science Foundation of Jiangsu Province(BK20130289)+3 种基金the Ph.D.Programs Foundation of Ministry of Education of China(20133201120008)the Priority Academic Program Development of Jiangsu Higher Education Institutionsthe Scientific Research Foundation for Returned Scholars,Ministry of Education of ChinaBeijing National Laboratory for Molecular Sciences,State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
文摘A methanol-soluble diamine-modified fullerene derivative(denoted as PCBDANI)was applied as an efficient cathode buffer layer(CBL)in planar p-i-n perovskite solar cells(pero-SCs)based on the CH_3NH_3PbI_(3-x)Cl_x absorber.The device with PCBDANI single CBL exhibited significantly improved performance with a power conversion efficiency(PCE)of 15.45%,which is approximately17%higher than that of the control device without the CBL.The dramatic improvement in PCE can be attributed to the formation of an interfacial dipole at the PCBM/Al interface originating from the amine functional group and the suppression of interfacial recombinationby the PCBDANI interlayer.To further improve the PCE of pero-SCs,PCBDANI/LiF double CBLs were introduced between PCBM and the top Al electrode.An impressive PCE of 15.71%was achieved,which is somewhat higher than that of the devices with LiF or PCBDANI single CBL.Besides the PCE,the long-term stability of the device with PCBDANI/LiF double CBLs is also superior to that of the device with LiF single CBL.
