Electrochemiluminescence from porous silicon in formic acid liquid‐junction cells
作者:
Will H. Green,
Eric J. Lee,
Jeffrey M. Lauerhaas,
Theodore W. Bitner,
Michael J. Sailor,
期刊:
Applied Physics Letters
(AIP Available online 1995)
卷期:
Volume 67,
issue 10
页码: 1468-1470
ISSN:0003-6951
年代: 1995
DOI:10.1063/1.114497
出版商: AIP
数据来源: AIP
摘要:
Visible light emission from porous silicon can be stimulated by applying a positive bias to a formic acid/sodium formate liquid junction cell. The emission lasts for 45 min at +2.75 V applied potential (<5 mA/cm2, power conversion efficiency ≳10−2%) and is reliably generated fromn‐ orp‐type porous silicon. An applied voltage as low as 1.3 V is capable of generating the red (720 nm) emission, indicating that current‐induced chemical reactions aid in the generation of charge carriers. A mechanism involving oxidation of formic acid followed by electron injection from a CO2−radical is proposed. Infrared spectra of the porous silicon surface taken after anodization show formation of a stable silyl‐ester species that is thought to be responsible for the increase in radiative recombination efficiency through passivation of surface defects. ©1995 American Institute of Physics.
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