Micro-photoluminescence spectroscopy on heavily-doped layers of silicon solar cells

Hieu T. Nguyen*, Di Yan, Fan Wang, Peiting Zheng, Young Han, Daniel Macdonald

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We report and explain the photoluminescence spectra emitted from silicon solar cells with heavily-doped layers at the surface. A micro-photoluminescence spectroscopy system is employed to investigate the total spectrum emitted from both the heavily-doped layer and the silicon substrate with micron-scale spatial resolution. The two regions of the device give rise to separate photoluminescence peaks, due to band-gap narrowing effects in the highly-doped layer. Two key parameters, the absorption depth of the excitation wavelength, and the sample temperature, are shown to be critical to reveal the separate signatures from the two regions. Finally, this technique is applied to locally diffused and laser-doped regions on silicon solar cell pre-cursors, demonstrating the potential value of this micron-scale technique in studying and optimizing locally doped regions. (

Original languageEnglish
Pages (from-to)230-235
Number of pages6
JournalPhysica Status Solidi - Rapid Research Letters
Issue number4
Publication statusPublished - 1 Apr 2015


  • band gaps
  • crystals
  • silicon
  • doping
  • photoluminescence
  • solar cells


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