Enhanced optical absorption due to E+-related band transition in GaAs:N δ-doped superlattices

Shuhei Yagi, Shunsuke Noguchi, Yasuto Hijikata, Shigeyuki Kuboya, Kentaro Onabe, Yoshitaka Okada, Hiroyuki Yaguchi

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9 Citations (Scopus)


The photoabsorption characteristics of GaAs:N δ-doped superlattices (SLs) are investigated. Periodic insertion of N δ-doped layers into GaAs induces the formation of conduction subbands E+ and E-, and each conduction subband forms SL minibands with the GaAs conduction band between the δ-doped layers. In addition to an optical absorption related to the E- band, an abrupt absorption edge originating from the electron transition between the valence band and an E+-related miniband is observed at 1.6eV in a photoluminescence excitation (PLE) spectrum, indicating that GaAs:N δ-doped SLs are promising candidates for the absorber of intermediate-band solar cells.

Original languageEnglish
Article number102301
JournalApplied Physics Express
Issue number10
Publication statusPublished - 2014 Oct 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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