Visible electroluminescence from porous silicon np heterojunction diodes

Fereydoon Namavar, H. Paul Maruska, Nader M. Kalkhoran

Research output: Contribution to journalArticlepeer-review

183 Scopus citations


We report the preparation of silicon-based visible light-emitting diodes, configured as heterojunctions between porous silicon (formed by electrochemical etching of p-type silicon wafers), and n-type indium tin oxide (ITO). The transparent ITO film allows light emission through the top surface of the device, under a forward electrical bias of several volts across the junction. Photogenerated currents are observed under reverse biases. A tentative model for this electroluminescence is presented, based on injection of minority carriers through a narrow interphase region into the porous silicon structure, where radiative recombination occurs.

Original languageEnglish (US)
Pages (from-to)2514-2516
Number of pages3
JournalApplied Physics Letters
Issue number20
StatePublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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