Photocurrent enhancement of porphyrin molecules over a wide-wavelength region based on combined use of silver nanoprisms with different aspect ratios

Kosuke Sugawa, Naoto Takeshima, Koji Uchida, Hironobu Tahara, Shota Jin, Natsumi Tsunenari, Tsuyoshi Akiyama, Yasuyuki Kusaka, Nobuko Fukuda, Hirobumi Ushijima, Yuji Tsuchido, Takeshi Hashimoto, Takashi Hayashita, Joe Otsuki

研究成果: Article査読

14 被引用数 (Scopus)

抄録

We succeeded in controlling the wavelength range in which the photocurrent of porphyrin is enhanced by tuning as well as expanding the wavelength ranges in which the localized surface plasmon resonance (LSPR) occurs. We fabricated photoelectric conversion systems consisting of 5,10,15,20-tetrakis(p-carboxyphenyl)porphyrin (TCPP) and silver nanoprisms with small (SAgPRs) and large (LAgPRs) aspect ratios as plasmonic nano-antennae. Their photocurrents were much larger than those from TCPP-modified Ag planar electrodes at the specific wavelengths corresponding to their LSPR bands (SAgPRs: 460-610 nm; LAgPRs: 610-690 nm). The maximum enhancement factors (EFs) for the SAgPRs and the LAgPRs were 37 and 35, respectively. In order to enhance the photocurrents, we expanded the LSPR bands by the combined use of SAgPRs and LAgPRs. The system consisting of the mixture (MAgPRs) showed enhancement of the photocurrent over the entire Q-band region (480-690 nm). Finally, the total EFs of the photocurrents were evaluated by irradiation with AM1.5G sunlight through a long-pass filter of 480 nm and the results revealed that the EFs were in the order of MAgPRs > SAgPRs > LAgPRs. Furthermore, the system showed stability without loss of the enhancement property for at least 10 min under the solar irradiation.

本文言語English
ページ(範囲)11439-11448
ページ数10
ジャーナルJournal of Materials Chemistry C
3
43
DOI
出版ステータスPublished - 2015
外部発表はい

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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