scholarly journals Local electronic structure analysis using a photoelectron emission microscope (PEEM) with hard X-ray

2006 ◽  
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Vol 03 (01n02) ◽  
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P. O. NILSSON ◽  
T. SCHMITT ◽  
R. CLAESSEN ◽  
A. Yu, EGOROV ◽  
...  

The local electronic structure of N atoms in Ga ( In ) AsN diluted alloys ( N concentration of 3%) is determined by soft-X-ray emission and absorption spectroscopies as element specific probes. The experimental spectra reflect the local 2p orbital-projected density-of-states of N impurities, the main recombination centers in Ga ( In ) AsN , which appears to deviate dramatically from crystalline GaN in both valence and conduction bands. In particular, we observe a N local charge transfer from the valence band maximum to deeper valence states, which fundamentally limits the optical efficiency of Ga ( In ) AsN , unless different N local environments are formed. The incorporation of In in large concentrations forms In -rich N local environments such as In 4 N , which become the main recombination centers in Ga ( In ) AsN due to a local decrease of the band gap. A k-conserving process of resonant inelastic X-ray scattering is discovered, which allows probing of the k-character of valence and conduction states despite the random alloy nature of Ga ( In ) AsN .


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