A T-shaped top electrode back reflective thin film solar cell

Abstract

The invention discloses a T-type top electrode back-reflection thin film solar cell. A plurality of stripe-shaped ribs made of the same material as a transparent top electrode are formed on the lower surface of the transparent top electrode, so that the top electrode locally forms a T-type structure; the lower surfaces of a P-type amorphous silicon thin film, an intrinsic amorphous silicon thin film, an N-type amorphous silicon thin film and a transparent conductive transition film below the ribs are projected downward to form stripe-shaped bumps; and the contact surface between a bottom electrode at a corresponding position and the transparent conductive transition film is provided with stripe-shaped curved reflection surfaces which are in one-to-one correspondence with the ribs. The top electrode of the T-type top electrode back-reflection thin film solar cell extends into thin films, so that the current collection capacity of an electrode is improved; film materials subsequently deposited on the electrode form the curved bumps, so that the area of the thin film cell is increased, and the light receiving surface of the cell is increased; the metal bottom electrode has a back-reflection surface with a concave mirror structure, so that the reflected light utilization of the cell is increased; and therefore, the light adsorption and utilization of the cell are improved, and the conversion efficiency of the cell is further improved.

Description

technical field

[0001] The invention relates to a T-shaped top electrode back reflection film solar cell, which belongs to the technical field of solar cells. Background technique

[0002] Photons, electrons, and phonons are all carriers of energy. As a photoelectric energy conversion device, solar cells mainly exchange energy between photons and electrons, and at the same time, phonons participate in this exchange process. This energy interaction mainly occurs within a few microns on the surface of solar cell materials, which provides a physical basis for manufacturing thin-film solar cells.

[0003] Amorphous silicon thin-film solar cells have become one of the most attractive silicon-based solar cells to reduce the cost of solar cells because of their advantages of significantly reducing the amount of silicon used and the low temperature of the manufacturing process. However, compared with other silicon-based solar cells, the conversion efficiency of amorphous silicon t...

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