Luminescence from Porous Silicon

  • A. Gupta Solid State Physics Laboratory, Delhi
  • V. K. Jain Solid State Physics Laboratory, Delhi
Keywords: Fabrication process, Light emission, Porous silicon, Electroluminescence, Photoluminescene


Recent observations of photoluminescene (PL) and electroluminescence (EL) from poroussilicon (PS) have prompted many theoretical and experimental studies. Bulk crystalline Si is anindirect band gap material in which .recombination is dominated by non-radiative processes.Therefore, it cannot be used as light-emitting component in Si circuits. PS is a new material formed byanodisation ofsingle crystal Si wafers in hydro fluoric (liF) solution. Luminescence from this materialis being explored for technological applications all over the world. The mechanism of luminescence isstill not well-understood. Several models have been proposed but still the facts about the strong lightemission at room temperature are unknown. This paper presents a review of the fabrication process andstudies on luminescent properties of PS. A hybrid model based on quantum confinement of carriers inthe nanometer size Si crystallites having a large number of surface states is suggested to explain theobserved properties.

Author Biographies

A. Gupta, Solid State Physics Laboratory, Delhi
Dr (Mrs) A Gupta obtained her MSc (Solid State Physics) from University of Roorkee in 1975 and PhD (Physics) from Birla Institute of Technology and Science (BITS), Pilani, in 1980. She hasworked as Assistant Lecturer at BITS, Pilani and as Research Associate at lIT, Delhi, before joiningDRDO at the Solidstate Physics Laboratory (SPL), Delh4 in 1982, where she is currently workingas Scientist E. Her areas of research include solar cells, porous silicon, nanostructures, Si sensors,microelectromechanical systems (MEMSs), quadrant photodetector, IMPATT diodes and semiconductor fuse. She has published more than 30 research papers. She is a life member of both Semiconductor Society of India and Materials Research Society of India.
V. K. Jain, Solid State Physics Laboratory, Delhi
Solidstate Physics Laboratory, Delhi


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How to Cite
Gupta, A., & Jain, V. (2013). Luminescence from Porous Silicon. Defence Science Journal, 48(1), 61-68.