Temperature dependence of the photoluminescence spectra of single crystals of CuInTe2

Rincón, C.; Wasim, S. M.; Marín, Gerardo; Pérez, G. Sánchez; Bacquet, G.

doi:10.1063/1.366183

Cited by 23 publications

(16 citation statements)

References 18 publications

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“…Previously, Rincón et al have studied the photoluminescence of CIT crystals in Refs. [1,2]. In these papers edge and excitonic PL radiation was presented.…”

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confidence: 96%

Deep and edge photoluminescence emission of CuInTe₂

Jagomägi¹,

Krustok

Raudoja

et al. 2003

Physica Status Solidi (b)

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PACS 61.72. Ji, 71.55.Ht, 78.55.Hx Photoluminescence studies of chalcopyrite CuInTe 2 were conducted. Three edge (1.041 eV, 1.030 eV, and 1.019 eV) and two deep level (0.999 eV and 0.957 eV) emission bands were observed at 11 K. The excitation intensity dependence of PL spectra was recorded. As possible band sources one excitonic and four band-to-defect recombination mechanisms are proposed in this paper.CuInTe 2 (CIT) and other chalcopyrite ternary crystals have recently attracted worldwide interest because of their optimal bandgap (about 1 eV) for photovoltaic conversion devices. Also, they provide high conversion efficiencies at relatively low expense.Photoluminescence (PL) is an easy-to-use and sensitive probe of defect levels inside forbidden band. However, the most interesting and challenging part is the interpretation of the experimental spectra.In the present paper we discuss the photoluminescence spectrum of chalcopyrite CuInTe 2 . Previously, Rincón et al. have studied the photoluminescence of CIT crystals in Refs. [1,2]. In these papers edge and excitonic PL radiation was presented. In addition, we report also the radiative emission of deep recombination centres.The CuInTe 2 powder samples were synthesised from the elements at 810 °C in fused quartz ampoules. The treatment continued with homogenising annealing at 665 °C, which is slightly lower than the peritectic temperature in CuInTe 2 [3]. The starting Cu/In concentration ratio was 1.03. The final polycrystalline CuInTe 2 ingot showed a well-defined chalcopyrite pattern in the XRD scan.The sample was cooled inside a closed-cycle He cryostat (T = 8-300 K) and excited with a 441 nm He-Cd laser with maximum output power 40 mW. The PL signal was recorded by using standard lock-in technique, computer-controlled SPM-2 grating monochromator (f = 40 cm) and InGaAs detector. The detected signal was corrected in conformity with grating efficiency and detector sensitivity spectra.The experimental PL spectrum of a CIT sample at 11 K is presented in Fig. 1. We distinguished five different PL bands -three near the band-edge bands (E 1 , E 2 , and E 3 ) and two deep bands (D 1 and D 2 ) with their phonon replicas. We found that the replicas appear according to the LO-phonon energy ħω LO = 23.2 meV. The corresponding peak positions and the possible band origins are presented in Table 1. The results were compared with theoretical calculations of defect levels in CIT [4], where the model of effective mass theory was applied.We identified that three types of recombination mechanisms governed our bands: excitonic, donor to valence band, and conduction band to acceptor emission. It is known that shallow levels, because of the

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“…Previously, Rincón et al have studied the photoluminescence of CIT crystals in Refs. [1,2]. In these papers edge and excitonic PL radiation was presented.…”

mentioning

confidence: 96%

Deep and edge photoluminescence emission of CuInTe₂

Jagomägi¹,

Krustok

Raudoja

et al. 2003

Physica Status Solidi (b)

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“…[2][3][4][5] However, very little work on its optical properties appears in the literature. Only recently, analysis of the temperature dependence of E G , 6 the photoluminescence, 7,8 and Urbach's tail in the absorption spectra 9 near the band edge region have been reported in CIT.…”

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confidence: 99%

Raman spectra of the chalcopyrite compound CuInTe2

Rincón

Wasim

Marín

et al. 1999

Journal of Applied Physics

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The lattice vibrational modes of the chalcopyrite compound CuInTe2 have been obtained at several temperatures by the unpolarized Raman spectra. Lines observed at 48, 74, 129, 138, 155, and 185 cm−1, identified with E modes, and at 60, 106, and 170 cm−1, assigned to B2 modes, agree quite well with the peaks reported from infrared reflectivity data. On the other hand, using the available theoretical models, the peaks that appear at 123 cm−1 and those observed around 65, 116, and 223 cm−1, which are only Raman active, are assigned to the A1 and B1 modes, respectively.

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“…The first remark, which can be given on these spectra, is that they present a very large band emission compared to the narrow bands observed on monocrystals of CuInTe 2 [21][22][23] and CuGaTe 2 [24].…”

Section: Photoluminescencementioning

confidence: 99%