Abstract:
A process for the production of high purity phosphorus characterised in that it comprises: (A) heating high purity red phosphorus in vacuo to cause it to vaporize; and (B) condensing liquid white phosphorus in vacuo is disclosed. Referring to the accompanying illustrative diagram, red phosphorus may be heated in bulb A and condensed in collective bulb G. The present invention provides advances over the prior art. For example, the clear, colourless phosphorus produced may be utilized as a source of P 4 species for chemical vapour deposition, sputtering, vacuum deposition and molecular beam deposition of phosphorus, polyphosphide and other phosphorus compound films for semiconductor and other applications including insulation and passivation.
Abstract:
@ A film deposition apparatus characterised in that it comprises: (A) a reservoir for containing pnictide; (B) means for passing an inert gas therethrough; (C) a film desposition reaction chamber; and (D) means for supplying inert gas carrying vapour species after passing through the said pnictide to the said reaction chamber. A process for the supply of a pnictide vapour species to a film deposition process characterised in that it comprises passing an inert gas through a reservoir of heated pnictide. Referring to the accompanying illustrative diagram, there may be identified reservoir (30), means (B) may comprise tube (28), a chamber (C) is indicated at (22) and means (D) may comprise tube (60). Such a pnictide bubbler feed system may be used to supply Pnictide, species for various film deposition processes, including chemical vapour deposition, sputtering, vacuum deposition and molecular beam epitazy. Films of pnictide, polypnictide and other pnictide compounds may be deposited for semiconductor and other applications including insulation and passivation. The pnictides used may include phosphorus, arsenic and antimony. The present invention represents an advance over the prior art.
Abstract:
A film deposition apparatus characterised in that it comprises:
(A) a reservoir containing heated pnictide; (B) means for passing an inert gas therethrough; (C) a high vacuum film deposition chamber; and (D) means for supplying the said inert gas carrying the said pnictide as a vapour species after passing through the said pnictide to the said deposition chamber is disclosed.
A high vacuum deposition process characterised in that it comprises passing an inert gas through heated pnictide and supplying the product gas to a vacuum chamber maintained at a pressure below 10- 3 Torr (1.33 x 10 -1 Pa) is also disclosed. Referring to the accompanying Illustrative diagram, the present apparatus may comprise reservoir (30), means for passing inert gas therethrough (28), deposition chamber (22) and supply means (60). Films of pnictide, polypnictide and other pnictide compounds may be deposited for semiconductor and other applications including insulation and passivation, particularly on III-V semiconductors. The present invention represents an advance over the prior art.
Abstract:
A vapour deposition process characterised in that an alkali metal intercalate is used as a source of alkali metal vapour is disclosed. The use of an alkali metal intercalate as a source of alkali metal vapour in a vapour deposition process is also disclosed, as in a source of alkali metal vapour for use in a vapour deposition process comprising an alkali metal intercalate. For example, a potassium graphite intercalate, KC 8 , may be heated to give a slow controlled release of potassium vapour for subsequent reaction with phosphorus vapour. Thin films of KP 15 and other polyphosphides may be produced by two-source vapour transport and by vacuum co-evaporation utilising KC 8 as the source of potassium vapour. RbC 8 and CsC 8 may be utilized as vapour sources to form the corresponding rubidium and cesium polyphosphides. The present invention represents an advance over the prior art.
Abstract:
@ A film deposition apparatus characterised in that it comprises:
(A) a reservoir for containing pnictide; (B) means for passing an inert gas therethrough; (C) a film desposition reaction chamber; and (D) means for supplying inert gas carrying vapour species after passing through the said pnictide to the said reaction chamber.
A process for the supply of a pnictide vapour species to a film deposition process characterised in that it comprises passing an inert gas through a reservoir of heated pnictide. Referring to the accompanying illustrative diagram, there may be identified reservoir (30), means (B) may comprise tube (28), a chamber (C) is indicated at (22) and means (D) may comprise tube (60). Such a pnictide bubbler feed system may be used to supply Pnictide, species for various film deposition processes, including chemical vapour deposition, sputtering, vacuum deposition and molecular beam epitazy. Films of pnictide, polypnictide and other pnictide compounds may be deposited for semiconductor and other applications including insulation and passivation. The pnictides used may include phosphorus, arsenic and antimony. The present invention represents an advance over the prior art.
Abstract:
A film deposition apparatus characterised in that it comprises: (A) a reservoir containing heated pnictide; (B) means for passing an inert gas therethrough; (C) a high vacuum film deposition chamber; and (D) means for supplying the said inert gas carrying the said pnictide as a vapour species after passing through the said pnictide to the said deposition chamber is disclosed. A high vacuum deposition process characterised in that it comprises passing an inert gas through heated pnictide and supplying the product gas to a vacuum chamber maintained at a pressure below 10- 3 Torr (1.33 x 10 -1 Pa) is also disclosed. Referring to the accompanying Illustrative diagram, the present apparatus may comprise reservoir (30), means for passing inert gas therethrough (28), deposition chamber (22) and supply means (60). Films of pnictide, polypnictide and other pnictide compounds may be deposited for semiconductor and other applications including insulation and passivation, particularly on III-V semiconductors. The present invention represents an advance over the prior art.
Abstract:
A process for the production of high purity phosphorus characterised in that it comprises:
(A) heating high purity red phosphorus in vacuo to cause it to vaporize; and (B) condensing liquid white phosphorus in vacuo is disclosed.
Referring to the accompanying illustrative diagram, red phosphorus may be heated in bulb A and condensed in collective bulb G. The present invention provides advances over the prior art. For example, the clear, colourless phosphorus produced may be utilized as a source of P 4 species for chemical vapour deposition, sputtering, vacuum deposition and molecular beam deposition of phosphorus, polyphosphide and other phosphorus compound films for semiconductor and other applications including insulation and passivation.
Abstract:
A vapour deposition process characterised in that an alkali metal intercalate is used as a source of alkali metal vapour is disclosed. The use of an alkali metal intercalate as a source of alkali metal vapour in a vapour deposition process is also disclosed, as in a source of alkali metal vapour for use in a vapour deposition process comprising an alkali metal intercalate. For example, a potassium graphite intercalate, KC 8 , may be heated to give a slow controlled release of potassium vapour for subsequent reaction with phosphorus vapour. Thin films of KP 15 and other polyphosphides may be produced by two-source vapour transport and by vacuum co-evaporation utilising KC 8 as the source of potassium vapour. RbC 8 and CsC 8 may be utilized as vapour sources to form the corresponding rubidium and cesium polyphosphides. The present invention represents an advance over the prior art.