Shin-Etsu Chemical Co., Ltd.

Shin-Etsu Handotai Co., Ltd.

Naoetsu Electronics Co., Ltd.

Satoyuki Ojima

Hiroyuki Ohtsuka

Takenori Watabe

Naoki Ishikawa

Masatoshi Takahashi

Toyohiro Ueguri

Takao Abe

Shigenori Saisu

Takeshi Akatsuka

Haruhiko Kano

Masanobu Yano

Tsutomu Onishi

A semiconductor substrate having an electrode formed thereon, the electrode including at least silver and glass frit, the electrode including: a multi-layered structure with a first electrode layer joined directly to the semiconductor substrate, and an upper electrode layer formed of at least one layer and disposed on the first electrode layer. The upper electrode layer is formed by firing a conductive paste having a total silver content of 75 wt % or more and 95 wt % or less, the content of silver particles having an average particle diameter of 4 &#x3bc;m or greater and 8 &#x3bc;m or smaller with respect to the total silver content in the upper electrode layer being higher than that in the first electrode layer.

Semiconductor substrate, electrode forming method, and solar cell fabricating method

The present invention is directed to a semiconductor substrate having at least an electrode formed thereon, in which the electrode has a multilayer structure including two or more layers, of the multilayer structure, at least a first electrode layer directly bonded to the semiconductor substrate contains at least silver and a glass frit, and contains, as an additive, at least one of oxides of Ti, Bi, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Si, Al, Ge, Sn, Pb, and Zn, and, of an electrode layer formed on the first electrode layer, at least an uppermost electrode layer to be bonded to a wire contains at least silver and a glass frit and does not contain the additive. This makes it possible to form, on a semiconductor substrate, an electrode adhered to the semiconductor substrate with sufficient adhesive strength and adhered to a wire via solder with sufficient adhesive strength by lowering both contact resistance and interconnect resistance.

Semiconductor substrate, method for forming electrode, and method for fabricating solar cell

The present invention is directed to a semiconductor substrate having an electrode formed thereon, the electrode including at least silver and glass frit, the electrode including: a multi-layered structure constituted of a first electrode layer joined directly to the semiconductor substrate, and an upper electrode layer formed of at least one layer and disposed on the first electrode layer; wherein the upper electrode layer is formed by firing a conductive paste having a total silver content of 75 wt % or more and 95 wt % or less, the content of silver particles having an average particle diameter of 4 &#x3bc;m or greater and 8 &#x3bc;m or smaller with respect to the total silver content in the upper electrode layer being higher than that in the first electrode layer. As a consequence, it is possible to form the electrode, which has the high aspect ratio and hardly suffers an inconvenience such as a break, on the semiconductor substrate by a simple method.

A screen printing plate having at least an opening portion that discharges a printing material for forming a target printing pattern on a matter to be printed is provided in screen printing, and the screen printing plate is characterized in that the size of the opening portion is reduced from the target printing pattern and an opening end portion of the opening portion has a projection and recess pattern shaped differently from the target printing pattern shape. By this arrangement, bleeding of the printing material of the screen printing can be controlled and a high-quality and low-cost screen printing plate is provided which can print a target printing pattern accurately and with high transfer performance even for a fine design.

Screen printing plate and screen printing apparatus

The present invention is an electrode material comprising at least, a silver powder, a glass frit, and an organic vehicle, wherein a rate of Ag content of the electrode material is 75 wt % to 95 wt %, and a ratio of contents of Ag grains having an average grain diameter of 0.5 &#x3bc;m to 3 &#x3bc;m and Ag grains having an average grain diameter of 4 &#x3bc;m to 8 &#x3bc;m in the electrode material is (the Ag grains having an average grain diameter of 0.5 &#x3bc;m to 3 &#x3bc;m):(the Ag grains having an average grain diameter of 4 &#x3bc;m to 8 &#x3bc;m)=20-80 wt %:80-20 wt %, and a solar cell comprising an electrode formed by using the electrode material. Thereby, an electrode material that can be stably filled in an electrode groove formed on a semiconductor device and that an electrode with narrow line width and small resistance loss can be easily formed by, and a solar cell with high power having an electrode formed by using the electrode material are provided.

Electrode material, solar cell, and method for producing solar cell

A method of fabricating a solar cell forms a large number of grooves on a first main surface of a p-type silicon single crystal substrate sliced out from a silicon single crystal ingot as described below. First an edge portion of a groove-carving blade is projected out from a flat substrate feeding surface of a working table by a predetermined height. The p-type silicon single crystal substrate is moved along the substrate feeding surface towards the rotating groove-carving blade while keeping a close contact of the first main surface thereof with the substrate feeding surface. Electrodes are then formed on the inner side face of thus-carved grooves only on one side in the width-wise direction thereof.

Solar cell and method of fabricating the same

An OECO solar cell using a semiconductor single crystal substrate having a plurality of grooves, wherein a minimum groove depth h of each groove always satisfies the relation of h&#x2267;Wtan &#x3b8; where &#x3b8; represents an angle between a line connecting the lower end, along the thickness-wise direction of the semiconductor single crystal substrate, of an electrode formed in the groove and the upper end of the inner side face of the same groove having no electrode formed thereon, and a reference line normal to the thickness-wise direction, and Wrepresents a distance between both opening edges of the groove; wherein the semiconductor single crystal substrate has thickness decreasing from a first side of a first main surface to a second side opposed to the first side; and wherein the plurality of grooves have a depth distribution of being deepest at a thickest position of the substrate, and a gradually becoming shallower towards a thinnest position of the substrate.

Solar cell and its manufacturing method

A solar cellhas a number of groovesformed in parallel with each other on a first main surfaceof a silicon single crystal substrate. An electrodeis formed on the inner side face of each grooveon one side. Each grooveis formed in the direction in disagreement with the &#x3c;110&#x3e; direction on the first main surface. This raises mechanical strength of the solar cell. The direction of formation of the groovespreferably crosses the &#x3c;110&#x3e; direction nearest to the direction of formation at an angle of 4&#xb0;&#x2dc;45&#xb0; on the acute angle side.

Solar cell and method for producing the same

A solar cell modulehas a plurality of solar cellshaving a plurality of parallel grooveson the individual light-receiving surfaces thereof, each of the grooves having an electrodefor extracting output on the inner side face (electrode-forming inner side face) on one side in the width-wise direction thereof; and a supportfor supporting the solar cellsin an integrated manner so as to direct the light-receiving surfaces upward. The annual power output can be increased by adjusting the direction of arrangement of the electrode-forming inner side faces of the grooveswhile taking the angle of inclination &#x3b2; of the light-receiving surface of the individual as-installed solar cellsrelative to the horizontal plane and the latitude &#x3b4; of the installation site of the solar cell module into consideration.

Growing community of inventors

Annaka, Japan

Satoyuki Ojima