On the theory of time-resolved band-tail luminescence in amorphous semiconductors

✍ Scribed by B. Esser

• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: English
• Weight: 800 KB
• Volume: 114
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2221140121

✦ Synopsis

Abstract

The time‐dependent moments of a luminescence band due to radiative recombination within electron‐hole pairs localized in band tail states are calculated. Besides the radiative process a competing non‐radiative process by tunneling of the excited electrons (or holes) to defect centres is assumed. The time dependence of the centre of the band ω~c~(t) and the linewidth σ(t) are shown to be determined by the time evolution of the tail region from which the electrons effectively recombine at t as well as from the time‐dependent electron‐hole separation in the Coulomb interaction. These two mechanisms act in an opposite way and as a result a non‐monotonous behaviour in both ω~c~(t) and σ(t) observed experimentally is obtained.