Interface properties and valence-band discontinuity of MnS/ZnSe heterostructures

Wang, L.; Sivananthan, S.; Sporken, R.; Caudano, R.

doi:10.1103/physrevb.54.2718

Cited by 34 publications

(21 citation statements)

References 15 publications

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“…They can therefore be easily integrated into complex multilayer structures with (Zn,Cd)Se. MnS, however, has a type II band offset with ZnSe and this limits its uses [19,20]. By contrast, MgS has a number of useful properties, the most important of which is its very large bandgap of ~5 eV.…”

Section: Properties Of Structures Containing Mgsmentioning

confidence: 99%

Growth by MBE and characterization of metastable group II sulphides

Prior

Bradford

David

et al. 2004

Physica Status Solidi (b)

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Many group II sulphides semiconductors have the rocksalt structure as their stable crystal structure. In the case of MgS and MnS it has been demonstrated that these compounds can be grown in the metastable zinc blende structure. Recently, at Heriot-Watt we have shown that a simple MBE growth procedure can be used to increase the thickness of these metastable layers to over 130 nm. In this paper, we summarise some of the results we have obtained and describe some of the structures which we have grown using these materials. The aim is to demonstrate that the growth method is simple, and that MgS in particular is a material with useful properties that can be incorporated into a variety of structures. Finally, we describe some potential uses of these compounds which we have not yet explored, and suggest other compounds which may be successfully grown with this method.1 Introduction It is possible, using a variety of methods, to produce compounds in crystal states which are not their lowest energy configurations. Perhaps the best-known example of this is carbon, where the well-known diamond structure is metastable with respect to the graphite structure. In the case of II-VI compounds, using thin film growth techniques such as MBE and MOCVD it is possible to grow compounds and alloys in the zinc blende (ZB) phase when this is not the lowest energy state. Examples are the growth of CdSe [1] and CdS [2] on (100) oriented substrates where the fourfold periodicity of the underlying layer causes adoption of the ZB phase rather than the lower energy wurtzite phase. II-VI compounds are different to III-Vs in the variety of crystal structures that they can adopt. In addition to ZB and wurtzite, the NaCl (rocksalt) structure is found. The lowest energy crystal structure which is adopted can be related to the ionicity f i of the compound and for f i < 0.625 II-VI compounds adopt the ZB structure [3]. Above this value the wurtzite structure occurs, with a transition to the rocksalt structure when f i < 0.78 [4].Unlike the compounds which have wurtzite as their stable phase that can be made to adopt the ZB structure on (001) surfaces, there is no symmetry requirement which can force the adoption of ZB instead of rocksalt. In this case both structures are cubic, and the differences are that atoms incorporated into a ZB layer have 4 nearest neighbours instead of 6 as is found in the rocksalt structure.In recent years, effort has gone in to exploring the growth of metastable ZB compounds, particularly MgS and MnS, which have similar lattice constants to GaAs. MgS is of particular interest as its Philips' ionicity is 0.786, placing it close to the rocksalt stability boundary [5]. Initial attempts to grow MgS by MBE produced ZB layers only 0.96 nm thick before changes in the RHEED pattern were observed which were believed to correspond to a change in the crystal structure to rocksalt [6]. Subsequent MOCVD growth obtained layers up to 10 nm thick in the ZB crystal structure [7] which were of high quality and could be incorporated in MgS...

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Section: Properties Of Structures Containing Mgsmentioning

confidence: 99%

Growth by MBE and characterization of metastable group II sulphides

Prior

Bradford

David

et al. 2004

Physica Status Solidi (b)

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“…Both b-MnS and g-MnS are metastable and tetrahedrally coordinated. These two metastable phases can only exist in a low temperature range and will transform into octahedrally coordinated a-MnS at 100-400 1C or at high pressure [9][10][11].…”

Section: Introductionmentioning

confidence: 98%

“…Nanocrystalline and polycrystalline thin films of MnS were prepared using chemical bath deposition method [17] and the thermal evaporation technique [9]. The direct growth of metastable b-MnS and g-MnS were also reported by gas source molecular beam epitaxy [10,11]. Recently, hydrothermal and solvothermal synthesis were used to prepare stable and metastable manganese sulfide in different nano and microforms (i.e.…”

Section: Introductionmentioning

confidence: 99%

Growth of different morphological features of micro and nanocrystalline manganese sulfide via solvothermal process

Biswas

Kar

Chaudhuri

2007

Journal of Crystal Growth

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“…Metastable -MnS occupies a potential position in short wavelength optoelectronic applications because of its large band gap. 16) For the preparation of -MnS, Lu et al 17) and Zhang et al 18) have reported that high temperatures are required to generate H 2 S from reagents, e.g. thiourea and thioacetamide, but the present study indicates that the SRB bioreactor can be used both in AMD treatment and in preparation of metastable -MnS at ambient temperatures.…”

Section: Mn Removal In the Srb Bioreactormentioning

confidence: 96%

Fundamental Study on the Removal of Mn<SUP>2+</SUP> in Acid Mine Drainage using Sulfate Reducing Bacteria

et al. 2004

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The optimum conditions for Mn 2þ removal from acid mine drainage was studied by a SRB (sulfate reducing bacteria) bioreactor. Chemical experiments with Na 2 S as a S 2À source were conducted to investigate the effects of pH, coexisting metal ions, and the components in a growth medium for SRB on MnS formation from Mn 2þ solutions. The amount of Mn removed from the Mn 2þ solutions decreased with decreasing pH. The Zn 2þ or Fe 2þ coexisting in the solutions consumed S 2À by forming ZnS or FeS, and this inhibited Mn removal. Sodium citrate, a component of the growth medium for SRB, formed a complex with Mn 2þ and suppressed MnS formation. Biological experiments using the SRB reactor were carried out at 37 C and it was confirmed that the Mn 2þ concentration decreased to less than 10 gÁm À3 from 100 gÁm À3 at neutral pHs (pH 5-7) after 100 hours when other metal ions and sodium citrate were absent. The formed precipitate was identified to be metastable -MnS with a band gap of about 3.8 eV by XRD, XRF, and UV-VIS.

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Interface properties and valence-band discontinuity of MnS/ZnSe heterostructures

Cited by 34 publications

References 15 publications

Growth by MBE and characterization of metastable group II sulphides

Growth by MBE and characterization of metastable group II sulphides

Growth of different morphological features of micro and nanocrystalline manganese sulfide via solvothermal process

Fundamental Study on the Removal of Mn<SUP>2+</SUP> in Acid Mine Drainage using Sulfate Reducing Bacteria

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