Front-mounted three-junction cascaded solar cell and preparation method thereof
A solar cell, three-junction technology, applied in the field of solar cells, can solve the problems of insufficient conversion and utilization of solar spectrum energy, increase the difficulty and cost of growth and process, and achieve simple manufacturing process, small current mismatch, The effect of reducing heat loss
Active Publication Date: 2016-03-09
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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However, there is still a major problem in this system that the Ge battery covers a wider spectrum, and its short-circuit current can reach twice that of the other two-junction batteries. Due to the constraints of the three-junction batteries connected in series, the energy of the solar spectrum corresponding to the Ge battery is not captured. full conversion
However, GaInP / GaAs / InGaAs (~1.0eV) triple-junction cells often use an inverted growth method due to a 2.1% lattice mismatch between GaAs and InGaAs cells, and then use techniques such as substrate lift-off to increase the growth rate. and the difficulty and cost of the process
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[0021] The front-mounted triple-junction cascaded solar cell provided by the present invention and its preparation method will be described in detail below in conjunction with the accompanying drawings.
[0022] Firstly, the specific implementation manner of the front-mounted triple-junction cascaded solar cell of the present invention is given with reference to the accompanying drawings.
[0023] Reference attached figure 1 , 2 As shown, among them, figure 1 It is a structural schematic diagram of the front-mounted three-junction cascaded solar cell provided in this specific embodiment, figure 2 for figure 1 The schematic diagram of the structure of the finished product of the three-junction cascaded solar cell shown in Fig. figure 1 , 2 The structure shown is described in detail.
[0024] This specific embodiment provides a positive three-junction cascaded solar cell, including: a GaAs substrate 31, an InGaAs bottom cell 24, a first tunnel junction 25, an InGaAsP midd...
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The invention provides a formal three-junction cascade solar battery and a production method thereof. Reasonable band gap combination of a multi-junction solar cell is achieved, and the production cost and the production difficulty of the battery are not increased while the current mismatch is reduced. The battery comprises a GaAs substrate which is provided with a GaInP transition layer, an InGaAs bottom battery, a first tunnel junction, an InGaAsP middle battery, a second tunnel junction, an InAIAs top battery and an ohmic contact layer in order. The production method of the battery comprises: 1), providing a GaAs substrate; 2), developing an In-group step entering GaIn transition layer, the InGaAs bottom battery, the first tunnel junction, the InGaAsP middle battery, the second tunnel junction, the InAIAs top battery and the ohmic contact layer in otder on the GaAs substrate; 3), producing a top electrode and a bottom electrode on the ohmic contact layer and the GaAs substrate respectively to obtain the target solar battery.
Description
technical field [0001] The present invention relates to the field of solar cells, in particular to a GaAs substrate-based InAlAs / InGaAsP / InGaAs positive triple-junction cascaded solar cell and a preparation method thereof. It has a theoretical conversion efficiency higher than 51%. Background technique [0002] In the field of III-V solar cells, multi-junction systems are usually used to achieve segmental absorption and utilization of the solar spectrum in order to obtain higher conversion efficiency. GaInP / GaAs / Ge and GaInP / GaAs / InGaAs (~1.0eV) triple-junction cells are the most researched and technically mature systems. The former currently achieves a maximum conversion efficiency of 32-33% under one sun. However, there is still a major problem in this system that the Ge battery covers a wider spectrum, and its short-circuit current can reach twice that of the other two-junction batteries. Due to the constraints of the three-junction batteries connected in series, the en...
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IPC IPC(8): H01L31/0687H01L31/0693H01L31/18
CPCY02E10/544Y02P70/50
Inventor 李奎龙董建荣孙玉润曾徐路赵勇明于淑珍赵春雨杨辉
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI