Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Temperature-dependent Photoluminescence Study on Aluminum-doped Nanocrystalline ZnO Thin Films by Sol-gel Dip-coating Method

  • Nam, Giwoong (Department of Nano Engineering, Inje University) ;
  • Lee, Sang-Heon (School of Chemical Engineering, Yeungnam University) ;
  • So, Wonshoup (School of Chemical Engineering, Yeungnam University) ;
  • Yoon, Hyunsik (Department of Nano Engineering, Inje University) ;
  • Park, Hyunggil (Department of Nano Engineering, Inje University) ;
  • Kim, Young Gue (Department of Nano Engineering, Inje University) ;
  • Kim, Soaram (Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University) ;
  • Kim, Min Su (Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University) ;
  • Jung, Jae Hak (Department of Nano Engineering, Inje University) ;
  • Lee, Jewon (Department of Nano Engineering, Inje University) ;
  • Kim, Yangsoo (Department of Nano Engineering, Inje University) ;
  • Leem, Jae-Young (Department of Nano Engineering, Inje University)
  • Received : 2012.09.10
  • Accepted : 2012.10.08
  • Published : 2013.01.20
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Abstract

The photoluminescence (PT) properties of Al-doped ZnO thin films grown by the sol-gel dip-coating method have been investigated. At 12 K, nine distinct PL peaks were observed at 2.037, 2.592, 2.832, 3.027, 3.177, 3.216, 3.260, 3.303, and 3.354 eV. The deep-level emissions (2.037, 2.592, 2.832, and 3.027 eV) were attributed to native defects. The near-band-edge (NBE) emission peaks at 3.354, 3.303, 3.260, 3.216, and 3.177 eV were attributed to the emission of the neutral-donor-bound excitons ($D^0X$), two-electron satellite (TES), free-to-neutral-acceptors (e,$A^0$), donor-acceptor pairs (DAP), and second-order longitudinal optical (2LO) phonon replicas of the TES (TES-2LO), respectively. According to Haynes' empirical rule, we calculated the energy of a free exciton (FX) to be 3.374 eV. The thermal activation energy for $D^0X$ in the nanocrystalline ZnO thin film was found to be ~25 meV, corresponding to the thermal dissociation energy required for $D^0X$ transitions.

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