RT info:eu-repo/semantics/article
T1 Composition, optical resonances, and doping of InP/InGaP nanowires for tandem solar cells: a micro-raman analysis
A1 Mediavilla Martínez, Irene
A1 Pura Ruiz, José Luis
A1 Hinojosa Chasiquiza, Vanessa Giselle
A1 Galiana, Beatriz
A1 Hrachowina, Lukas
A1 Borgström, Magnus T.
A1 Jiménez López, Juan Ignacio
K1 Semiconductor nanowires
K1 Raman
K1 Tunnel diode
K1 Plasmon mode
K1 InGaP
K1 nP axial heterostructures
K1 Alloy composition
K1 2210.27 Estados de la Materia
AB We present a micro-Raman study of InP/InGaP tandem junction photovoltaicnanowires. These nanowires render possible InGaP compositions that cannot be made in thinfilms due to strain. The micro-Raman spectra acquired along the nanowires reveal theexistence of compositional changes in the InGaP alloy associated with the doping sequence.The heavily Zn-doped InxGa1−xP (x is the In molar fraction) side of the tunnel diode is Garich, x = 0.25, with respect to the n-type and intrinsic segments of the top cell, which are closeto the nominal composition of the NWs (x = 0.35). The p-type end segment is still Ga-rich.Electromagnetic resonances are observed in the tunnel diode. The Raman signal arising fromthe InGaP side of the tunnel diode is significantly enhanced. This enhancement permits theobservation of a Raman mode that can be associated with an LO phonon plasmon coupledmode (LOPCM). This mode has not been previously reported in the literature of InGaP, andit permits the Raman characterization of the tunnel diode. The analysis of this mode and itsrelation to the LO phonon modes of the alloy, InP-like and GaP-like, allows to establish an apparent one-mode behavior forthe phonon plasmon coupling. It indicates that hole plasma couples to the GaP-like LO mode. The LOPCMs are modeledusing the Lindhard Mermin formalism for the dielectric function.
PB ACS (American Chemical Society)
SN 1936-0851
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/72666
UL https://uvadoc.uva.es/handle/10324/72666
LA eng
NO ACS Nano, 2024, vol. 18, n. 14, p. 10113-10123
NO Producción Científica
DS UVaDOC
RD 18-dic-2024