Radiatively Dominated Charge Carrier Recombination in Black Phosphorus

Prashant Bhaskar, Alexander W. Achtstein, Martien J W Vermeulen, Laurens D A Siebbeles

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

We show that black phosphorus is a highly efficient infrared emitter. To study the carrier dynamics, excess electron-hole pairs were generated in bulk black phosphorus by irradiation with 3 MeV electron pulses. The transient microwave conductivity due to excess charges was measured as a function of time for different initial charge densities at temperatures in the range 203-373 K. A new global analysis scheme, including the treatment of intrinsic carriers, is provided, which shows that the recombination dynamics in black phosphorus, a low bandgap semiconductor, is strongly influenced by the presence of intrinsic carriers. The temperature dependence of the charge mobility and charge carrier decay via second-order radiative recombination is obtained from modeling of the experimental data. The combined electron and hole mobility was found to increase with temperature up to 250 K and decrease above that. Auger recombination is negligible for the studied densities of excess electron-hole pairs up to 2.5 × 1017 cm-3. For this density the major fraction of the excess electrons and holes undergoes radiative recombination. It is further inferred that for excess charge densities of the order of 1018 cm-3 electrons and holes recombine with near unity radiative yield. The latter offers promising prospects for use of black phosphorus as efficient mid infrared emitter in devices.

Original languageEnglish
Pages (from-to)13836-13842
Number of pages7
JournalThe Journal of Physical Chemistry C
Volume120
Issue number25
DOIs
Publication statusPublished - 30 Jun 2016

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