Abstract:
A high contrast reflective mirror (24) includes a plurality of alternating first monocrystalline layers (14) and second monocrystalline layers (16). The first monocrystalline layers are formed of an oxide material that has a cubic structure and a first index of refraction. The second monocrystalline layers are formed of a semiconductor material that has a second index of refraction. The first index of refraction and the second index of refraction differ by at least about 0.5
Abstract:
Light emitting devices (262) and optically-active material (264) can be formed overlying monocrystalline substrates such as large silicon wafers (266) using a compliant substrate for growing the devices (262). One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer (266). The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer.
Abstract:
Multijunction solar cell structures (100) including high quality epitaxial layers of monocrystalline semiconductor materials that are grown overlying monocrystalline substrates (102) such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers are disclosed. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer (104) on a silicon wafer. The accommodating buffer (104) layer is a layer of monocrystalline material spaced apart from the silicon wafer by an amorphous interface layer (112) of silicon oxide. The amorphous interface layer (112) dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. Multiple and varied accommodating buffer layers can be used to achieve the monolithic integration of multiple non-lattice matched solar cell junctions (302, 304).
Abstract:
High quality epitaxial layers of monocrystalline materials can be grown overlying large silicon wafers by first growing an accommodating buffer layer (104) on a silicon wafer (102). The accommodating buffer layer (104) is a layer of monocrystalline material spaced apart from the silicon wafer (102) by an amorphous interface layer (108) of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline accommodating buffer layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer. Utilizing this technique permits the fabrication of thin film pyroelectric devices (150) on a monocrystalline silicon substrate.
Abstract:
High quality epitaxial layers of monocrystalline materials (26) can be grown overlying monocrystalline substrates (22) such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. An accommodating buffer layer (24) comprises a layer of monocrystalline oxide spaced apart from the silicon wafer (22) by an amorphous interface layer (28) of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating bufferlayer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. A monocrystalline layer (26) is then formed over the accommodating buffer layer, such that a lattice constant of the monocrystalline layer substantially matches the lattice constant of a subsequently grown monocrystalline film.
Abstract:
A highly tunable structure (20) can be monolithically integrated upon a monocrystalline semiconductor substrate (22) according to the structure and process described herein. High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates (22) such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. An amorphous interface layer (28) dissipates strain and permits the growth of a high quality monocrystalline buffer layer (24). In addition, formation of a compliant substrate may include utilizing surfactant enhanced epitaxy (61) and epitaxial growth of Zintl phase materials (130).
Abstract:
High quality epitaxial layers of conductive monocrystalline materials can be grown overlying monocrystalline substrates (22) such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer (24) on a silicon wafer (22). The accommodating buffer layer (24) is a layer of monocrystalline material spaced apart from the silicon wafer (22) by an amorphous interface layer (28) of silicon oxide. The amorphous interface layer (28) dissipates strain and permits the growth of a high quality monocrystalline accommodating buffer layer (24).