A temperature dependent (10K-290K) photoluminescence (PL) study for two differently prepared ZnO thin films (as-grown and O-plasma treated) is presented. Four characteristic peaks were identified for both samples: (i) neutral donor-bound excitons (<TEX>$D^oX$</TEX>), (ii) two electron satellites (TES), (iii) phonon replica of <TEX>$D^oX$</TEX> (<TEX>$D^oX$</TEX>-1LO), and (iv) donor-acceptor pair transition (DAP). As the sample temperature increased, <TEX>$D^oX$</TEX>-1LO and DAP transitions became indistinct. This was accompanied by newly-rising emission of free electron-acceptor transitions (e, <TEX>$A^o$</TEX>). The spectral evolution with temperature for as-grown samples also showed the optical emission from free excitons, which became dominant at higher temperatures. Some features related to O-plasma were identified in PL spectra: (i) different positions of TES transitions (28meV lower than <TEX>$D^oX$</TEX> for as-grown samples and 35meV for O-plasma treated samples), (ii) the decrease of spectral intensity in both emissions of <TEX>$D^oX$</TEX> and DAP after O-plasma treatment, and (iii) no noticeable transition from free excitons after the O-plasma treatment.
© 2013 Optical Society of Korea
(160.6000) Materials : Semiconductor materials
(250.5230) Optoelectronics : Photoluminescence
(300.0300) Spectroscopy : Spectroscopy
(310.3840) Thin films : Materials and process characterization
Original Manuscript: August 20, 2013
Revised Manuscript: October 16, 2013
Manuscript Accepted: October 16, 2013
Published: December 25, 2013
Jaewon Cho, Jinsung Choi, SeGi Yu, and Seuk Joo Rhee, "Photoluminescence Study on O-plasma Treated ZnO Thin Films," J. Opt. Soc. Korea 17, 543-547 (2013)
References are not available for this paper.
OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.