Electro-Optical Evidence for the Chelate Effect at Semiconductor Surfaces
- 18 May 1990
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 248 (4957), 840-843
- https://doi.org/10.1126/science.248.4957.840
Abstract
Monoamines and diamines dissolved in cyclohexane solution reversibly enhance the band-edge photoluminescence (PL) intensity of immersed n-type cadmium sulfide (n-CdS) and n-type cadmium selenide (n-CdSe) substrates through adsorption. The magnitude of the PL increase is used to estimate amine-induced contractions in the semiconductor's depletion width, and the dependence of the PL intensity on amine concentration provides an estimate of the adduct formation constant. Two diamines, ethylenediamine and o-phenylenediamine, exhibit unusually low reductions in depletion width and substantially larger adduct equilibrium constants relative to the other amines studied, consistent with chelation to surface Cd2+ ions. These studies demonstrate that PL can be used as a contactiess, in situ technique for characterizing the steric and electronic landscape of semiconductor surfaces and for correlating molecular and surface chemistry.Keywords
This publication has 20 references indexed in Scilit:
- Evidence for adduct formation at the semiconductor-solution interface: photoluminescent properties of cadmium selenide in the presence of lanthanide .beta.-diketonate complexesThe Journal of Physical Chemistry, 1990
- Effect of EDTA on the photocatalytic activities and flatband potentials of cadmium sulfide and cadmium selenideThe Journal of Physical Chemistry, 1990
- The Chemistry of Solid-State ElectronicsScience, 1989
- Semiconductor olefin adducts. Photoluminescent properties of cadmium sulfide and cadmium selenide in the presence of butenesJournal of the American Chemical Society, 1989
- Photophysics of quantized colloidal semiconductors. Dramatic luminescence enhancement by binding of simple aminesThe Journal of Physical Chemistry, 1986
- The concept of Lewis acids and bases applied to surfacesJournal of the American Chemical Society, 1982
- Crystal structure of tetrakis(o-phenylenediamine)nickel(II) chloride-bis(o-phenylenediamine) adduct, [Ni(OPDA)4]Cl2.20PDA, a crystal containing bidentate, monodentate and toothless OPDAInorganic Chemistry, 1974
- The CdS-MnS and CdSe-MnSe Phase DiagramsJournal of the American Ceramic Society, 1968
- Intramolecular hydrogen bonds in ethylenediamines and otheraliphatic diaminesCanadian Journal of Chemistry, 1967
- Ionization Potentials of Ammonia and Some AminesThe Journal of Chemical Physics, 1957