Summary
Reflectance and electroreflectance measurements from 2.5 to 5.5 eV, performed on arsenic heavily doped silicon samples, are reported and discussed. Silicon crystals implanted with arsenic up to a fluence of 1017 cm−2 were laser irradiated and a free-carrier concentration of the order of 1021cm−3 was reached. The reordering of the system is studied in detail at different initial conditions. A comparison between reflectance and electro-reflectance appears to be quite useful to determine the behaviour of the heavily doped semiconductor.
Riassunto
In questo lavoro si riportano e discutono misure di riflettanza ed elettroriflettanza, nell'intervallo (2.5÷5.5) eV, eseguite sui campioni di silicio pesantemente drogato con arsenico. I campioni di silicio, impiantati con arsenico fino a una dose di 1017cm−2, sono stati sottoposti a laser annealing e sono state raggiunte concentrazioni di portatori liberi dell'ordine di 1021cm−3. Il riordinamento del sistema è studiato in dettaglio in corrispondenza a diverse condizioni iniziali e un confronto fra riflettanza ed elettroriflettanza appare molto utile per determinare il comportamento di un semiconduttore pesantemente drogato.
Резюме
Приводятся и обсуждаются результаты измерений отражения и электроотражения в области от 2.5 до 5.5 эВ на образцах кремния, сильно легированных мишьяком. Кристаллы кремния, имплантированные мышьяком с флуенсом 1017cm−2, облучаются лазером и концентрация свободных носителей достигает порядка 1021cm−3. При различных началыных условиях подробно исследуется переупорядочение системы. Сравнение отражения и электроотражения оказывается поленым для определения поведения сильно легированных полупроводников.
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Borghesi, A., Geddo, M., Guizzetti, G. et al. Reflectancevs. Electroreflectance measurements on arsenic-doped silicon crystal. Il Nuovo Cimento D 10, 979–988 (1988). https://doi.org/10.1007/BF02450198
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DOI: https://doi.org/10.1007/BF02450198