Different precursors were prepared via a simple low heat solid state reaction（LHSSR） upon changing the ligands. The ZnO photoanode films were obtained by the doctor blade technique, and their composition, thermal de...Different precursors were prepared via a simple low heat solid state reaction（LHSSR） upon changing the ligands. The ZnO photoanode films were obtained by the doctor blade technique, and their composition, thermal decomposition process and morphologies were identified by means of X-ray diffraction（XRD）, thermal gravimetric analysis-differential thermal analysis（TGA-SDTA） and scanning electron microscope（SEM）. The results show that the morphologies of ZnO photoanodes are irregular block, regular lamellar and irregular sheet-cluster, and the multistage structure can be found in all the photoanodes. Furthermore, there exists a genetic effect of morphology between the precursors and the corresponding photoanodes. The optimum power conversion efficiency of the sheet-cluster ZnO photoanode was 3.12% with the short circuit current density（dsc） being 11.23 mA/cm2. The multistage sheet-cluster structure could result in the increase of the scattering of the incident light and provide a rapid electronic transmission channel to reduce the risk of electronic recombination. A beneficial enlightenment was obtained to simplify the process and the photoanode films with various morphologies can be prepared with lower price in the further research.展开更多
Direct evidence of effects of surface plasmon resonance（SPR） of gold naaorods（GNRs） on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO2（GNR@SiO2） c...Direct evidence of effects of surface plasmon resonance（SPR） of gold naaorods（GNRs） on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO2（GNR@SiO2） core-shell nanoparticles into a photoelectric conversion system. GNR with asymmetric shape had unusual anisotropic SPR[transversal surface plasmon resonance（TSPR） and longitudinal surface plasmon resonance（LSPR）]. The excel- lent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efflciency（PCE）. The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in Jsc, while Vo~ and FF were unchanged. The improvement was mostly contributed by the SPR of the GNRs with coupling of N719. And there was also a complementary to N719 in visible light range. Therefore, SPR is an effective tool in improving the photocurrent and consequently enhancement of PCE. The TSPR and LSPR effects of GNRs on light harvesting were reflected in the increased monochromatic incident photon-to-electron conversion efficiency（IPCE）. We also utilized finite-difference tirne-domain（FDTD） to investigate the light coupling of GNRs with TiO2. Compare to the base anode, the IPCE of optimized electrode showed significant improvement and peaks broadening at 500--600 nm and 610--710 nm. We got an increase in overall conversion efficiency from 6.4% to 7.5%.展开更多
文摘Different precursors were prepared via a simple low heat solid state reaction（LHSSR） upon changing the ligands. The ZnO photoanode films were obtained by the doctor blade technique, and their composition, thermal decomposition process and morphologies were identified by means of X-ray diffraction（XRD）, thermal gravimetric analysis-differential thermal analysis（TGA-SDTA） and scanning electron microscope（SEM）. The results show that the morphologies of ZnO photoanodes are irregular block, regular lamellar and irregular sheet-cluster, and the multistage structure can be found in all the photoanodes. Furthermore, there exists a genetic effect of morphology between the precursors and the corresponding photoanodes. The optimum power conversion efficiency of the sheet-cluster ZnO photoanode was 3.12% with the short circuit current density（dsc） being 11.23 mA/cm2. The multistage sheet-cluster structure could result in the increase of the scattering of the incident light and provide a rapid electronic transmission channel to reduce the risk of electronic recombination. A beneficial enlightenment was obtained to simplify the process and the photoanode films with various morphologies can be prepared with lower price in the further research.
基金Supported by the National Natural Science Foundation of China（Nos.91333120, 21271016） and the National Basic Research Program of China（No.2012CB720904）.
文摘Direct evidence of effects of surface plasmon resonance（SPR） of gold naaorods（GNRs） on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO2（GNR@SiO2） core-shell nanoparticles into a photoelectric conversion system. GNR with asymmetric shape had unusual anisotropic SPR[transversal surface plasmon resonance（TSPR） and longitudinal surface plasmon resonance（LSPR）]. The excel- lent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efflciency（PCE）. The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in Jsc, while Vo~ and FF were unchanged. The improvement was mostly contributed by the SPR of the GNRs with coupling of N719. And there was also a complementary to N719 in visible light range. Therefore, SPR is an effective tool in improving the photocurrent and consequently enhancement of PCE. The TSPR and LSPR effects of GNRs on light harvesting were reflected in the increased monochromatic incident photon-to-electron conversion efficiency（IPCE）. We also utilized finite-difference tirne-domain（FDTD） to investigate the light coupling of GNRs with TiO2. Compare to the base anode, the IPCE of optimized electrode showed significant improvement and peaks broadening at 500--600 nm and 610--710 nm. We got an increase in overall conversion efficiency from 6.4% to 7.5%.
