摘要:
The present invention relates to a method for electrochemical treatments of a semiconductor material and the electrical pulse generator for said method used in the production of three-dimensional structures integrated in a wafer of semiconductor material or free standing nanostructured particles, characterized in that it comprises at least one step for the anodic formation of one or multiple porous layers etched in a semiconductor by means of applying electric current pulses with modulation of its intensity in time, a step of lifting the layers from the substrate by ultrasounds or mechanically and, optionally, a step of mechanical grinding.
摘要:
Methods and apparatus for forming porous silicon layers are provided. In some embodiments, an anodizing bath includes: a housing having a first volume to hold a chemical solution; a cathode disposed within the first volume at a first side of the housing; an anode disposed within the first volume at a second side of the housing, opposite the first side, wherein a face of each of the cathode and the anode have a given surface area; a substrate holder configured to retain a plurality of substrates along a perimeter thereof within the first volume in a plurality of substrate holding positions, a plurality of vent openings fluidly coupled to the first volume to release process gases, wherein a top of each of the plurality of vent openings are disposed above a chemical solution fill level in the first volume.
摘要:
This disclosure enables high-productivity fabrication of porous semiconductor layers (made of single layer or multi-layer porous semiconductors such as porous silicon, comprising single porosity or multi-porosity layers). Some applications include fabrication of MEMS separation and sacrificial layers for die detachment and MEMS device fabrication, membrane formation and shallow trench isolation (STI) porous silicon (using porous silicon formation with an optimal porosity and its subsequent oxidation). Further, this disclosure is applicable to the general fields of photovoltaics, MEMS, including sensors and actuators, stand-alone, or integrated with integrated semiconductor microelectronics, semiconductor microelectronics chips and optoelectronics.
摘要:
This disclosure enables high-productivity fabrication of porous semiconductor layers (made of single layer or multi-layer porous semiconductors such as porous silicon, comprising single porosity or multi-porosity layers). Some applications include fabrication of MEMS separation and sacrificial layers for die detachment and MEMS device fabrication, membrane formation and shallow trench isolation (STI) porous silicon (using porous silicon formation with an optimal porosity and its subsequent oxidation). Further, this disclosure is applicable to the general fields of photovoltaics, MEMS, including sensors and actuators, stand-alone, or integrated with integrated semiconductor microelectronics, semiconductor microelectronics chips and optoelectronics.
摘要:
A photovoltaic cell (100) is proposed. The photovoltaic cell includes a substrate (105; 105') of semiconductor material, and a plurality of contact terminals (Tf,Tb) each one arranged on a corresponding contact area (122) of the substrate for collecting electric charges being generated in the substrate by the light. For at least one of the contact areas, the substrate includes at least one porous semiconductor region (125) extending from the contact area into the substrate for anchoring the whole corresponding contact terminal on the substrate. In the solution according to an embodiment of the invention, each porous semiconductor region has a porosity decreasing moving away from the contact area inwards the substrate. An etching module (400) and an electrolytic module (700;700';800;800') for processing photovoltaic cells, a production line (900) for producing photovoltaic cells, and a process for producing photovoltaic cells are also proposed.
摘要:
This disclosure enables high-productivity fabrication of semiconductor-based separation layers (made of single layer or multi-layer porous semiconductors such as porous silicon, comprising single porosity or multi-porosity layers), optical reflectors (made of multi-layer / multi-porosity porous semiconductors such as porous silicon), formation of porous semiconductor (such as porous silicon) for anti-reflection coatings, passivation layers, and multi- junction, multi-band-gap solar cells (for instance, by forming a variable band gap porous silicon emitter on a crystalline silicon thin film or wafer-based solar cell). Other applications include fabrication of MEMS separation and sacrificial layers for die detachment and MEMS device fabrication, membrane formation and shallow trench isolation (STI) porous silicon (using porous silicon formation with an optimal porosity and its subsequent oxidation). Further the disclosure is applicable to the general fields of Photovoltaics, MEMS, including sensors and actuators, stand-alone, or integrated with integrated semiconductor microelectronics, semiconductor microelectronics chips and optoelectronics.
摘要:
An anodization device and an anodization method for electrochemically processing a substrate to be processed by using it as the anode and irradiating it with light, enabling the processing of a large-sized substrate to be processed with a smaller-sized constituent element. The electrical contact by with the substrate is effected by a plurality of contact members or by moving a contact member while changing the position. The substrate is so fabricated that the conductive layers of the portions to be processed of the substrate are connected to the respective contact portions of the contact members. The combination of this substrate and the contact members is used to energize only a part of the contact members by means of a switch. Alternatively, the contact members are energized to a part of the conductive layers of the substrate by the movement of the contact members. Thus, the current required for the anodization can be the one required for only a part of the portions to be processed.
摘要:
A liquid treating device having a light source comprises a base plate holding block for holding a base plate, and a frame body forming a liquid treating tank connected to the base plate and opened at the upper end and having an inner wall surface inclined with respect to the vertical direction of the base plate surface. Since the frame body has the inclined inner wall surface, the radiation light directed from the light source to the base plate can be prevented from casting a shadow over the base plate as it is obstructed by the inner wall surface or the radiation light reflected by this inner wall surface can be prevented from falling on the base plate or from having its uniformity impaired.
摘要:
A method for fabricating a semiconductor device, in accordance with the present invention, includes the steps of providing a semiconductor wafer having exposed p-doped silicon regions and placing the wafer in an electrochemical cell such that a solution including electrolytes interacts with the exposed p-doped silicon regions to form an oxide on the exposed p-doped silicon regions when a potential difference is provided between the wafer and the solution.