Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (5): 772-780.doi: 10.1007/s40242-018-8120-3

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Multispectral Plasmon of Anisotropic Core-shell Gold Nanorods@SiO2: Dual-band Absorption Enhancement with Coupling Dye Molecules

CHE Yuping1, WANG Yang2, YOU Tingting1, CHANG Huaiqiu3, YIN Penggang1, ZHAI Jin1   

  1. 1. Key Laboratory of Bio-inspired Smart Interfacial Science and Technology, Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry, Beihang University, Beijing 100191, P. R. China;
    2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China;
    3. National Center for Nanoscience and Technology, Beijing 100190, P. R. China
  • Received:2018-04-13 Revised:2018-06-29 Online:2018-10-01 Published:2018-07-11
  • Contact: ZHAI Jin,Email:zhaijin@buaa.edu.cn E-mail:zhaijin@buaa.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.91333120, 21271016) and the National Basic Research Program of China(No.2012CB720904).

Abstract: Direct evidence of effects of surface plasmon resonance(SPR) of gold nanorods(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 excellent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efficiency(PCE). The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in Jsc, while Voc 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 time-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%.

Key words: Gold nanorod, Plasmon, Dual-band absorption, Dye-sensitized solar cell (DSSC), N719