Light receiving element module and manufacturing method therefor
Light receiving elements of a back connection type including first and second electrodes on their back sides are connected by an inter-element connecting body including a tabular main body section and an inter-element connecting section to form a light receiving element module. The main body section is selectively directly connected to the first electrode and arranged on the second electrode via an insulating layer. The main body section covers substantially the entire back side of each of the light receiving elements excluding a part of the second electrode. The second electrode is connected to the inter-element connecting section of an adjacent light receiving element. The main body section forms a reflecting section between the main body section and the light receiving element to enable reflected light to be made incident on the light receiving element from a gap between the first and second electrodes.
1. A light receiving element module comprising:
a light receiving element of a back connection type including first and second electrodes with different polarities on a back side; and
an inter-element connecting body;
wherein the inter-element connecting body includes:
a tabular main body section selectively connected to the first electrode, arranged on the second electrode via an insulating layer, and configured to cover substantially the entire back side of the light receiving element excluding a part of the second electrode; and
an inter-element connecting section connected to a part of the second electrode of the light receiving element uncovered with the main body section.
2. The light receiving element module according to claim 1 including a plurality of the light receiving elements, wherein
one end of the inter-element connecting section is connected to the main body section and the other end is connected to the second electrode of the light receiving element adjacent to its own light receiving element.
3. The light receiving element module according to claim 1 , wherein the main body section is made of a metal plate or a foil and joined to the first electrode of the light receiving element via an electric connection body selectively formed only for a connecting point between the main body section and the first electrode.
4. The light receiving element module according to claim 1 , wherein the main body section is made of a metal plate or a foil and joined to the first electrode of the light receiving element via a solder layer.
5. The light receiving element module according to claim 1 , wherein, in the main body section, the front-side surface in a portion other than a connecting point to the first electrode of the light receiving element is formed of a light reflector to reflect light transmitted through the light receiving element.
6. The light receiving element module according to claim 1 , wherein, in a surface of the main body section opposed to the light receiving element, a concave section is formed with respect to the light receiving element in a region equivalent to the second electrode of the light receiving element.
7. The light receiving element module according to claim 1 , wherein the main body section and the inter-element connecting section are integrally formed.
8. The light receiving element module according to claim 1 , wherein the main body section and the inter-element connecting section are separately formed.
9. The light receiving element module according to claim 1 , wherein an electric connection body is selectively formed only in joining sections between the first and second electrodes and the light receiving element.
10. The light receiving element module according to claim 1 , wherein the first electrode on the light receiving element projects toward the main body side of the inter-element connecting body compared with the second electrode.
11. The light receiving element module according to claim 1 , wherein the main body section of the inter-element connecting body has an uneven structure and is connected to the first electrode by a convex section.
12. The light receiving element module according to claim 11 , wherein, a direction perpendicular to an extending direction of the second electrode, the width of a concave section with respect to a light receiving surface side in the uneven structure of the main body section of the inter-element connecting body is narrow than the width of the first electrode.
13. The light receiving element module according to claim 1 , wherein the main body section has an insulating layer on a region equivalent to a second electrode of the main body's surface opposed to the light receiving element.
14. The light receiving element module according to claim 1 , wherein insulative resin including reflective particles is filled between the main body section and the light receiving element.
15. The light receiving element module according to claim 1 , wherein the main body section is formed by a two-layer structure of an element rear portion arranged on the light receiving element side and an outer side portion arranged on an outer side.
16. The light receiving element module according to claim 2 , wherein
a plurality of the light receiving elements are connected by the inter-element connecting body to form a string, and the light receiving element at an end of the string has an electrode pattern similar to that of the light receiving element inside the string, and wherein
an element electrode of the light receiving element at the string end is arranged to be rotated with respect to an element electrode of the light receiving element inside the string by a sum of at least one external angles among external angles of a polygon formed by vertexes of an element substrate surface.