SOLAR CELL, METHOD FOR MANUFACTURING THE SAME, AND ELECTRICAL EQUIPMENT

• US 20180240920A1
• Filed: 09/19/2017
• Published: 08/23/2018
• Est. Priority Date: 02/23/2017
• Status: Abandoned Application

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: WANG, Lizhong
• Application Number:
  US15/708,562
• Publication Number:
  US 20180240920A1
• Time in Patent Office: Days
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H01L 21/02491 Conductive materials
• CPC Class Codes: H01L 21/02554 Oxides
• CPC Class Codes: H01L 21/02603 Nanowires
• CPC Class Codes: H01L 21/0262 Reduction or decomposition of gaseous compounds, e.g. CVD
• CPC Class Codes: H01L 29/0676 oriented perpendicular or at an angle to a substrate
• CPC Class Codes: H01L 29/068 comprising a junction
• CPC Class Codes: H01L 31/022425 for solar cells
• CPC Class Codes: H01L 31/022483 composed of zinc oxide [ZnO]
• CPC Class Codes: H01L 31/0336 in different semiconductor regions, e.g. Cu2X/CdX hetero- junctions, X being an element of Group VI of the Periodic Table
• CPC Class Codes: H01L 31/035227 the quantum structure being quantum wires, or nanorods carbon nanotubes H10K85/211
• CPC Class Codes: H01L 31/035281 Shape of the body
• CPC Class Codes: H01L 31/072 the potential barriers being only of the PN heterojunction type
• CPC Class Codes: H01L 31/0725 Multiple junction or tandem solar cells
• CPC Class Codes: H01L 31/18 Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• CPC Class Codes: H01L 31/1864 Annealing
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

The present disclosure provides a solar cell, a method for manufacturing the same, and an electrical equipment. The solar cell comprises a first substrate and a second substrate arranged opposite to each other; and a plurality of PN junctions arranged between the first substrate and the second substrate, each of the plurality of PN junctions connecting the first substrate and the second substrate and comprising an inner core serving as a P electrode, and a coating layer serving as an N electrode and coating the inner core.

Claims

1. A solar cell, comprising:

a first substrate and a second substrate arranged opposite to each other; and

a plurality of PN junctions arranged between the first substrate and the second substrate, each of the plurality of PN junctions connecting the first substrate and the second substrate and comprising an inner core serving as a P electrode, and a coating layer serving as an N electrode and coating the inner core.

2. The solar cell according to claim 1, wherein

the inner core is made of a material comprising zinc oxide, and the coating layer is made of a material comprising gallium nitride.

3. The solar cell according to claim 1, wherein

each of the plurality of PN junctions has a shape of cylinder, and the cylinder has a nano-scale diameter.

4. The solar cell according to claim 1, wherein

the second substrate serves as a light-absorbing surface of the solar cell, and both ends of each of the plurality of PN junctions are in direct contact with the first substrate and the second substrate, respectively;

the inner core is of a nanowire structure and substantially vertically arranged on the first substrate; and

the inner core has an outer side surface, a first end in contact with the first substrate and a second end directed to and not in contact with the second substrate;

the coating layer comprises a first portion and a second portion, the first portion covers the outer side surface of the inner core, the second portion covers the second end of the inner core and is sandwiched between the second end of the inner core and the second substrate and in direct contact with the second substrate; and

the PN junctions are arranged at intervals, and the inner cores are arranged at intervals.

5. The solar cell according to claim 1, wherein

the second substrate serves as a light-absorbing surface of the solar cell, and only the coating layer of each of the plurality of PN junctions is in contact with the second substrate.

6. The solar cell according to claim 1, wherein

the first substrate comprises a gold film, and the inner core of each of the plurality of PN junctions is arranged on the gold film of the first substrate.

7. The solar cell according to claim 1, wherein

the plurality of PN junctions are uniformly distributed between the first substrate and the second substrate.

8. A method for manufacturing the solar cell according to claim 1, comprising:

depositing a P electrode material on a first substrate so as to form inner cores of a plurality of PN junctions;

coating the inner cores with an N electrode material so as to form coating layers of the plurality of PN junctions; and

arranging a second substrate opposite to the first substrate so that each of the plurality of PN junctions is connected to the first substrate and the second substrate.

9. The method according to claim 8, wherein

the depositing the P electrode material on the first substrate so as to form the inner cores of the plurality of PN junctions comprises:

depositing the P electrode material on the first substrate through a chemical vapor deposition process or a hydrothermal electrophoretic deposition process so as to form the inner cores of the plurality of PN junctions, wherein the P electrode material comprises zinc oxide.

10. The method according to claim 9, wherein

the depositing the P electrode material on the first substrate through the chemical vapor deposition process comprises:

sputtering a cocatalyst comprising gold on the first substrate so as to form a gold film on the first substrate; and

heating the first substrate at a temperature of 500-800 degrees Celsius for 0.5-1.5 hours by using zinc acetate or zinc nitrate as a raw material, and 50-150 sccm of gas mixture of argon and oxygen as a carrier gas, so as to form the inner cores deposited with zinc oxide on the gold film of the first substrate, wherein argon;

oxygen=10;

1.

11. The method according to claim 8, wherein

the coating the inner cores with the N electrode material comprises:

fixing the N electrode material to the inner cores and coating the inner cores through a sintering process, wherein the N electrode material comprises gallium nitride.

12. The method according to claim 11, wherein

the fixing the N electrode material to the inner cores and the coating the inner cores through the sintering process comprise:

heating the first substrate formed with the inner cores on the gold film at a temperature of 700-900 degrees Celsius for 0.5-2 hours by using gallium oxide or gallium nitrate as a raw material, and 50-150 sccm of ammonia gas as a carrier gas such that the inner core on the gold film of the first substrate is coated with gallium nitride to obtain the coating layer.

13. The method according to claim 8, wherein

each of the plurality of PN junctions has a shape of cylinder, and the cylinder has a nano-scale diameter.

14. The method according to claim 8, wherein

the second substrate serves as a light-absorbing surface of the solar cell, and both ends of each of the plurality of PN junctions are in direct contact with the first substrate and the second substrate, respectively;

the inner core is of a nanowire structure and substantially vertically arranged on the first substrate; and

the inner core has an outer side surface, a first end in contact with the first substrate and a second end directed to and not in contact with the second substrate;

the coating layer comprises a first portion and a second portion, the first portion covers the outer side surface of the inner core, the second portion covers the second end of the inner core and is sandwiched between the second end of the inner core and the second substrate and in direct contact with the second substrate; and

the PN junctions are arranged at intervals, and the inner cores are arranged at intervals.

15. The method according to claim 8, wherein

the plurality of PN junctions are uniformly distributed between the first substrate and the second substrate.

16. An electrical equipment comprising the solar cell according to claim 1.

17. The electrical equipment according to claim 16, wherein

the inner core is made of a material comprising zinc oxide, and the coating layer is made of a material comprising gallium nitride.

18. The electrical equipment according to claim 16, wherein

each of the plurality of PN junctions has a shape of cylinder, and the cylinder has a nano-scale diameter.

19. The electrical equipment according to claim 16, wherein

the second substrate serves as a light-absorbing surface of the solar cell, and both ends of each of the plurality of PN junctions are in direct contact with the first substrate and the second substrate, respectively;

the inner core is of a nanowire structure and substantially vertically arranged on the first substrate; and

the inner core has an outer side surface, a first end in contact with the first substrate and a second end directed to and not in contact with the second substrate;

the coating layer comprises a first portion and a second portion, the first portion covers the outer side surface of the inner core, the second portion covers the second end of the inner core and is sandwiched between the second end of the inner core and the second substrate and in direct contact with the second substrate; and

the PN junctions are arranged at intervals, and the inner cores are arranged at intervals.

20. The electrical equipment according to claim 16, wherein

the plurality of PN junctions are uniformly distributed between the first substrate and the second substrate.