Nitride-based multi-junction solar cell modules and methods for making the same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-031/042
H01L-031/0232
H01L-021/00
출원번호
US-0891202
(2010-09-27)
등록번호
US-8624103
(2014-01-07)
발명자
/ 주소
Li, Jizhong
출원인 / 주소
Taiwan Semiconductor Manufacturing Company, Ltd.
대리인 / 주소
Slater & Matsil, L.L.P.
인용정보
피인용 횟수 :
1인용 특허 :
256
초록▼
A backside illuminated multi junction solar cell module includes a substrate, multiple multi junction solar cells, and a cell interconnection that provides a series connection between at least two of the multi junction solar cells. The substrate may include a material that is substantially transpare
A backside illuminated multi junction solar cell module includes a substrate, multiple multi junction solar cells, and a cell interconnection that provides a series connection between at least two of the multi junction solar cells. The substrate may include a material that is substantially transparent to solar radiation. Each multi junction solar cell includes a first active cell, grown over the substrate, for absorbing a first portion of the solar radiation for conversion into electrical energy and a second active cell, grown over the first active cell, for absorbing a second portion of the solar radiation for conversion into electrical energy. At least one of the first and second active cells includes a nitride.
대표청구항▼
1. A method comprising: forming a plurality of solar cell mesas over a substrate;providing, in each mesa, a first active cell for absorbing solar radiation for conversion into electrical energy, the providing the first active cell comprising epitaxially growing a first active cell layer over the sub
1. A method comprising: forming a plurality of solar cell mesas over a substrate;providing, in each mesa, a first active cell for absorbing solar radiation for conversion into electrical energy, the providing the first active cell comprising epitaxially growing a first active cell layer over the substrate, the first active cell layer comprising a first p-n junction, the first active cell having a first bandgap energy;providing, in each mesa and over each first active cell, a second active cell for absorbing solar radiation for conversion into electrical energy, the providing the second active cell comprising epitaxially growing a second active cell layer over the first active cell layer, the second active cell layer comprising a second p-n junction, the second active cell having a second bandgap energy, the first bandgap energy being greater than the second bandgap energy;forming a dielectric layer over the plurality of solar cell mesas and the substrate, the plurality of solar cell mesas being disposed between the substrate and at least a portion of the dielectric layer; andelectrically connecting the plurality of solar cell mesas,wherein at least one of the first and second active cells of each mesa comprises a nitride. 2. The method of claim 1, wherein the substrate comprises a material that is substantially transparent to solar radiation. 3. The method of claim 1, wherein the substrate comprises silicon, and at least one of the first and second active cells of at least one mesa comprises a III-nitride material. 4. The method of claim 1, wherein the first active cell absorbs solar radiation in a range from approximately 3.4 eV to approximately 4.0 eV, and the second active cell absorbs solar radiation in the range from approximately 2.0 eV to approximately 3.4 eV. 5. The method of claim 4 further comprising providing, in each mesa and over each second active cell, a third active cell for absorbing solar radiation for conversion into electrical energy, the third active cell absorbing solar radiation in a range from approximately 0.7 eV to approximately 2.0 eV. 6. The method of claim 1 further comprising bonding the plurality of solar cell mesas to a carrier, the plurality of solar cell mesas being disposed between the substrate and the carrier. 7. The method of claim 1 wherein the substrate comprises an electrically isolating portion. 8. The method of claim 1 further comprising forming a buffer layer over the substrate, the buffer layer being disposed between the substrate and the first active cell of each mesa. 9. The method of claim 1 further comprising providing, in each mesa and over each second active cell, a third active cell for absorbing solar radiation for conversion into electrical energy, the third active cell having a third bandgap energy, the second bandgap energy being greater than the third bandgap energy. 10. The method of claim 1, wherein the epitaxially growing the first active cell includes using a process at a first temperature, the epitaxially growing the second active cell includes using a process at a second temperature, and the first temperature is greater than the second temperature. 11. The method of claim 1 further comprising providing, in each mesa and over each second active cell, a third active cell for absorbing solar radiation for conversion into electrical energy, the third active cell having a third bandgap energy, the second bandgap energy being greater than the third bandgap energy, wherein the forming the plurality of solar cell mesas, the providing the first active cell, the providing the second active cell, and the providing the third active cell further comprises: epitaxially growing a third active cell layer over the second active cell, the third active cell comprising a third p-n junction. 12. The method of claim 11, wherein the epitaxially growing the first active cell includes using a process at a first temperature, the epitaxially growing the second active cell includes using a process at a second temperature, the epitaxially growing the third active cell using a process at a third temperature and the first temperature is greater than the second temperature, the second temperature being greater than the third temperature. 13. The method of claim 1 further comprising etching the first active cell layer and the second active cell layer to provide the plurality of solar cell mesas. 14. The method of claim 1 further comprising electrically connecting the plurality of solar cell mesas in series. 15. The method of claim 1 further comprising: forming a first contact grid through the dielectric layer to a base portion of each mesa; andforming a second contact grid through the dielectric layer to a distal portion of each mesa, the distal portion of each mesa being distal from the substrate. 16. The method of claim 1 further comprising electrically connecting the plurality of solar cell mesas in parallel. 17. The method of claim 1, wherein the dielectric layer is an optically reflective dielectric layer. 18. The method of claim 1 further comprising: forming a grid on a carrier substrate that corresponds to a pattern of the plurality of solar cell mesas; andbonding the plurality of solar cell mesas to the grid on the carrier substrate. 19. The method of claim 18 further comprising forming an optically reflective dielectric layer on the carrier substrate and within the grid.
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