Solar battery unit

Abstract

The invention discloses a solar battery unit. The solar battery unit comprises an electrode withdrawing structure making a unit monomer easy to install and dismount relative to the connecting side substrate. The solar battery unit (10) is configured in a way to make a generation electrode (11) and an opposite electrode (28) opposed with a generation layer (36) located therebetween. The generation electrode (11) comprises a transparent electrode (14) formed on a translucent substrate main face (12A), a collector electrode (18) and the generation layer (36). The opposite electrode (28) forms a metal electrode (24) and a catalyst layer (26) on the substrate main face (20A). A through hole (16) is formed generally on the central part of a substrate (12). An annular exposed part not overlapping with the opposite electrode (28) is formed on the periphery of the through hole (16). A withdrawing part (an annular part (18A)) of the collector electrode (18) is formed on the exposed part. A through hole (22) larger than the through hole (16) is formed on another substrate (20).The substrate (20) is further connected with metal films (24A, 24B) formed on substrate main faces (20A, 20B) through a metal film (24C) formed on the inner wall face of the through hole (22). The metal film (24B) is set as a withdrawing part so as to make the positive electrode and the negative electrode have the same withdrawing direction.

Description

technical field [0001] The present invention relates to solar cells, and more particularly, to solar cells related to the structure of the extraction electrodes. Background technique [0002] Solar cells are roughly classified into silicon-based, compound-based, organic-based, and the like depending on the material of the light-absorbing layer (power-generating layer). Among them, dye-sensitized solar cells (Dye-sensitized solar cells (hereinafter referred to as "DSC")) are constructed by forming a semiconductor layer (for example, TiO 2 ) and a counter electrode (positive electrode) on which a catalyst metal is formed, sandwiching an electrolyte solution containing iodine redox (for example, refer to FIG. 13 of Patent Document 1 below) . The power generation mechanism of this DSC goes through the following cycles (1) to (4). [0003] (1) When sunlight is incident on the light-receiving surface, electrons are excited in the dye (pigment) by energy absorption. [0004] (2...

AI Technical Summary

Problems solved by technology

[0014] However, in the above-mentioned Patent Document 1, the positive electrode substrate is processed to expose the electrode metal, and the processed hole is filled with a conductive paste or the like. Since the extraction direction is set in the same direction, it is necessary to consider the tightness of the conductive paste of the electrode. Adhesion, etc., from the viewpoint of reliability such as electrode peeling in cycle tests, etc., this is disadvantageous

In addition, in the structure of the above-mentioned patent document 2, there is a problem that the structure on the installation side becomes complicated.

[0015] In addition, in the case of conventional silicon-based and compound-based solar cells, for example, in the case of being applied to a panel placed on a roof, when mounted on the connection substrate side, even if some solar cells deteriorate, according to Its structure requires the replacement of the entire panel, and there is a disadvantage that it is difficult to replace the unit alone

Therefore, although the deteriorated part is only a part, it is necessary to stop the operation of the entire panel and decide to reduce the cumulative power generation time according to the time until the replacement is completed, resulting in a disadvantage that the utilization efficiency (or operation rate) of the photovoltaic power generation system is reduced.

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