Overlapping effects of the optical transitions of GaNAs thin films grown by molecular beam epitaxy

Cortes-Mestizo, I.E.; Espinosa-Vega, L.I.; Espinoza-Figueroa, José Ángel; Yee-Rendón, C. M.; Zamora-Peredo, L.; Rodríguez, Ángel Gutiérrez; Mercado-Ornelas, C.A.; Perea-Parrales, F.E.; Méndez-García, V.H.

doi:10.1016/j.tsf.2020.137969

Cited by 5 publications

(1 citation statement)

References 29 publications

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“…The GaAsN alloy is nearly lattice‐matched with a GaAs substrate and has been featured due to its specific characteristics represented by drastic bandgap reduction in a dilute nitrogen composition ([N]) region ([N] ≦ 3%). [ 1–4 ] Therefore, this GaAsN alloy has been used for some devices such as a near‐infrared wavelength laser with a nanowire based on GaAsN [ 5 ] and a multi junction solar cell using a GaAsSb/GaAsN superlattice [ 6,7 ] or an InGaAsN. [ 8 ] Especially, this GaAsN is expected to be applicable for a 1.0 eV zone material in a multi junction solar cell on a GaAs substrate.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence Mechanism in Heavily Si‐Doped GaAsN

Tsukasaki

Hiyoshi

Fujita

et al. 2021

Crystal Research and Technology

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The photoluminescence (PL) mechanism is discussed for heavily Si‐doped GaAsN, and the evaluation method of electron effective mass (me*) is proposed using its PL peak energy. PL peak energy monotonically decreases as increasing temperature, so the S‐shape characteristic is vanished for this heavily Si‐doped GaAsN as opposed to moderately Si‐doped GaAsN. This result shows that the dominant PL process is an optical transition from the Fermi energy to the top of valence band independent of temperature for this heavily Si‐doped GaAsN, as with degenerate n‐type GaAs. Because PL peak energy is expressed by the sum of bandgap energy, the increased energy of the Burstein–Moss effect, and the decreased energy of the bandgap narrowing, me* is calculated to be 0.098 m0 for this heavily Si‐doped GaAsN with nitrogen composition of 0.6%, where m0 is the electron mass. This result agrees well with previous studies, meaning that the method for estimation of me is effective for dilute GaAsN.

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