Mixed-type heterojunction thin-film solar cell structure and method for fabricating the same

Abstract

The present invention discloses a mixed-type heterojunction thin-film solar cell structure and a method for fabricating the same. Firstly, a conductive substrate and a template are provided, and the template has a substrate and an inorganic wire array formed on the substrate. Next, a conjugate polymer layer is formed on the conductive substrate. Next, the inorganic wire array is embedded into the conjugate polymer layer. Next, the substrate is separated from the inorganic wire array. Then, an electrode layer is formed over the inorganic wire array and the conjugate polymer layer. The solar cell structure of the present invention has advantages of flexibility, high energy conversion efficiency and low fabrication cost.

Description

RELATED APPLICATIONS[0001]This application is a Divisional patent application of co-pending application Ser. No. 12 / 222,691, filed on 14 Aug. 2008. The entire disclosure of the prior application Ser. No. 12 / 222,691, from which an oath or declaration is supplied, is considered a part of the disclosure of the accompanying Divisional application and is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method for fabricating a solar cell structure, particularly to a mixed-type heterojunction thin-film solar cell structure and a method for fabricating the same.[0004]2. Description of the Related Art[0005]Fossil fuels are going to be exhausted by the end of this century. The search and development for substitute energies, such as wind power, tide power, and biofuel, has been progressing for a period of time. Among them, solar energy has relative higher market acceptability, and many nations have been devoted...

AI Technical Summary

Benefits of technology

The present invention provides a mixed-type heterojunction thin-film solar cell structure and a method for fabricating it. The method involves using a conductive substrate and a template with inorganic wire arrays to form a conjugate polymer layer. The inorganic wire arrays are then separated from the substrate and an electrode layer is formed over the inorganic wire arrays and the conjugate polymer layer. The resulting solar cell has flexible and high energy conversion efficiency, and can also reduce the cost of solar cells.

Problems solved by technology

However, the fabrication cost thereof is too high to popularize solar energy.

However, the contact area between donors and acceptors is too small to increase the probability of exciton (hole-electron pair) fission.

Thus, the performance of this type of polymer solar cell is hard to promote.

However, the two materials are not uniformly distributed in the active layer, which results in the following two cases.

One is that there are likely to be paths directly connecting the anode and cathode, decreasing the parallel resistance and increasing leakage current.

The other is that there are likely to be isolated areas having none path to the electrodes, wherefore the external circuit cannot collect the current of holes and electrons separated in the isolated areas.

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