Picosecond time-resolved luminescence studies of surface and bulk recombination processes in InP

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Abstract

Recombination processes in InP have been studied using picosecond-time- resolved photoluminescence (PL). The technique makes it possible to measure the intrinsic surface recombination velocity (SRV) and the bulk lifetime directly and independently. The results show that both p- and n-type InP(110) etched surfaces have similarly low SRV, contrary to commonly accepted values. Moreover, it is found that n-type InP is distinguished by a very long nonradiative lifetime nr (320 ns) and the bulk recombination process is mainly radiative. On the other hand, the nr of p-type InP is very small (33 ns), apparently due to a high concentration of deep traps, and nonradiative bulk recombination is dominant. These results are discussed in view of other measurements and models. The SRV of metal/InP interfaces shows a strong dependence on the reactivity of the metal-semiconductor anion pair, which resembles the dependence found for the Schottky-barrier height at these interfaces. These measurements are compared to results also obtained in this work for UHV-cleaved surfaces.

Original languageEnglish
Pages (from-to)9108-9119
Number of pages12
JournalPhysical Review B-Condensed Matter
Volume45
Issue number16
DOIs
StatePublished - 1992

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