Heterojunction solar cell and manufacturing method thereof
A solar cell and heterojunction technology, which is applied in the field of solar cells, can solve problems such as unfavorable carrier transport, lower crystal quality, and lower solar cell efficiency, so as to avoid carrier recombination loss and improve photoelectric performance and efficiency , Improve the effect of transportation efficiency
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[0027] The first specific embodiment
[0028] This specific embodiment provides a heterojunction solar cell with a structure such as Figure 4E As shown, it includes a first thin film 403 with a first conductivity type, an active region 402 and a second thin film 401 with a second conductivity type sequentially arranged on the surface of the first thin film 403, the first thin film 403 A contact layer 408 with a first conductivity type that is different from the first thin film 403 is also included between the active area 402 and the first thin film 403 and the second thin film 401 respectively. The area 402 is a gradient layer structure. The contact layer 408 and the active region 402 with a graded layer reduce the barrier height between the first thin film 403 and the active region 402 and between the second thin film 401 and the active region 402. Compared with traditional solar cells, Improve the carrier transport efficiency.
[0029] The above-mentioned first c...
Example
[0042] Second specific embodiment
[0043] image 3 The method flow chart of the second specific embodiment of the manufacturing method of the heterojunction solar cell is shown.
[0044] Figure 4A to 4E Shown is the process flow chart of the second specific embodiment for preparing the heterojunction solar cell.
[0045] This specific embodiment provides a method for manufacturing a heterojunction solar cell as described in the first specific embodiment, including the steps:
[0046] Step 300, growing a contact layer of the same conductivity type that is different from the first film on the exposed surface of the first film;
[0047] Step 301, epitaxially grow an active region with a graded structure on the exposed surface of the contact layer;
[0048] Step 302, growing a second thin film layer different from the active region on the exposed surface of the active region, and the conductivity types of the first thin film and the second thin film are opposite.
[0049] As an alter...
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