Method for testing quantum efficiency of five-junction solar cell

Abstract

The invention discloses a method for testing the quantum efficiency of a five-junction solar cell, and belongs to the technical field of solar cell testing. A 660nm bias light source and a 1340nm bias light source are added on an existing three-junction solar cell quantum efficiency testing system, and the light current of five sub-cells can be accurately measured by adjusting the intensity of each bias light.

Description

Technical Field

[0001] The invention belongs to the technical field of solar cell testing, and relates to a method for testing the quantum efficiency of a five-junction solar cell. Background Art

[0002] Ordinary single-junction solar cells can only absorb light in a certain band of the entire solar spectrum, but the use of a multi-junction stacked structure can broaden the band of solar spectrum absorption, which can not only increase the utilization of the solar spectrum, but also reduce the heat loss of high-energy photons, thereby improving the photoelectric conversion efficiency.

[0003] Compared with traditional germanium-based three-junction solar cells, five-junction solar cells have higher theoretical efficiency. However, the common quantum efficiency test methods are mostly designed for three-junction solar cells, which cannot well reflect the current limiting relationship of each junction of five-junction solar cells. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method for testing the quantum efficiency of a five-junction solar cell, which can accurately measure the photocurrent of the five sub-cells and provide data support and feedback for the research and development of the five-junction solar cell.

[0005] The present invention is implemented as follows: a method for testing the quantum efficiency of a five-junction solar cell, in which two bias light sources of 660nm and 1340nm are added to the existing three-junction solar cell quantum efficiency testing system, and the testing method comprises the following steps:

[0006] Step 1: Place the sample to be tested on the test table of the test system, turn on the mechanical pump to adsorb the sample on the sample table, and then press the probe on the positive electrode of the sample to form a test circuit;

[0007] Step 2: Turn on the 660nm and 1050nm bias lights, adjust the intensities of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the first sub-cell;

[0008] Step 3, turn off the 660nm and 1050nm bias lights, turn on the 530nm and 850nm bias lights, adjust the intensities of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the second sub-cell;

[0009] Step 4: turn off the 850nm bias light, turn on the 1050nm bias light, adjust the intensity of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the third sub-cell;

[0010] Step 5, turn off the 1050nm bias light, turn on the 850nm and 1340nm bias lights, adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the fourth sub-cell;

[0011] Step six, turn off the 1340nm bias light, turn on the 660nm and 850nm bias lights, adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the fifth sub-cell.

[0012] The advantages and technical effects of the present invention are as follows: the existing quantum efficiency testing equipment is not equipped with sufficient bias light sources and cannot distinguish the quantum efficiency of each sub-cell of a five-junction battery; the present invention specifically adds two groups of bias light sources on the existing basis, and by adjusting the intensity of each bias light, the photocurrent of the five sub-cells can be accurately measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the testing process of the present invention;

[0014] Figure 2 This is the quantum efficiency result diagram of the five-junction solar cell tested using this method. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] The present invention is further described below in conjunction with examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] 1. As Figure 1 As shown, the sample to be tested is placed on the test table of the test system, the mechanical pump is turned on to allow the sample to be adsorbed on the sample table, and then the probe is pressed on the positive electrode of the sample to form a test circuit;

[0018] 2. Turn on the 660nm and 1050nm bias lights, adjust the intensity of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and measure the quantum efficiency of the first sub-cell;

[0019] 3. Turn off the 660nm and 1050nm bias lights, turn on the 530nm and 850nm bias lights, adjust the intensities of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and measure the quantum efficiency of the second sub-cell.

[0020] 4. Turn off the 850nm bias light and turn on the 1050nm bias light. Adjust the intensity of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and measure the quantum efficiency of the third sub-cell.

[0021] 5. Turn off the 1050nm bias light, turn on the 850nm and 1340nm bias lights. Adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and measure the quantum efficiency of the fourth sub-cell.

[0022] 6. Turn off the 1340nm bias light, turn on the 660nm and 850nm bias lights. Adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and measure the quantum efficiency of the fifth sub-cell.

[0023] Test results see Figure 2 .

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A method for testing the quantum efficiency of a five-junction solar cell, characterized in that: Two bias light sources of 660nm and 1340nm are added to the existing triple-junction solar cell quantum efficiency test system. The test method includes the following steps: Step 1: Place the sample to be tested on the test table of the test system, turn on the mechanical pump to adsorb the sample on the sample table, and then press the probe on the positive electrode of the sample to form a test circuit; Step 2: Turn on the 660nm and 1050nm bias lights, adjust the intensities of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the first sub-cell; Step 3, turn off the 660nm and 1050nm bias lights, turn on the 530nm and 850nm bias lights, adjust the intensities of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the second sub-cell; Step 4: turn off the 850nm bias light, turn on the 1050nm bias light, adjust the intensity of the two bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the third sub-cell; Step 5, turn off the 1050nm bias light, turn on the 850nm and 1340nm bias lights, adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the fourth sub-cell; Step six, turn off the 1340nm bias light, turn on the 660nm and 850nm bias lights, adjust the intensities of the three bias lights until the photocurrent signal of the sample to be tested reaches the maximum, and start measuring the quantum efficiency of the fifth sub-cell.

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