Novel up-converter and application of novel up-converter in solar cell
A converter, a new type of technology, applied in the field of solar cells, can solve the problems of low quantum luminous efficiency, weak absorption, etc., to achieve the effect of broadening response, increasing absorption, and improving battery efficiency
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Embodiment 1
[0028] The solar cell structure with up-converter of the present invention is such as figure 1 As shown, 1 is a silicon-based solar cell; 2 is an up-converter; 3 is a back reflection layer, which can be a transparent film of a glassy substance or a metal oxide, and its function is to reflect the light emitted by the up-converter and make the light re-enter battery thereby increasing the absorption of the battery.
[0029] The preparation method of the up-converter is as follows:
[0030] Preparation of quantum dot PbS: sodium lauryl sulfate (0.05mol), cetyltrimethylammonium bromide (0.05mol), ethylenediaminetetraacetic acid (0.2mol) were dissolved in 100ml, 70 ℃ constant temperature to In deionized water, stir for 5 minutes under the action of a magnetic stirrer, then add a few drops of dilute ammonia water to adjust the pH of the solution to 10, then add 10ml, 0.05mol / L lead acetate solution and stir for 1-2 minutes. Finally, slowly add 20ml, 0.025mol / L thiourea solution an...
Embodiment 2
[0033] The preparation method of the up-converter is as follows:
[0034] The quantum dot materials PbS and NaYF were respectively 4 :18%Yb 3+ ,2%Er 3+ The light-emitting material doped with rare earth ions and the low-temperature curing material silicone gel are mixed into a uniform colloidal mixture by magnetic stirring. The ratio of the quantum dot material to the silica gel is 2g of the quantum dot material dissolved in 5ml of the silica gel; the ratio of the up-conversion luminescent material to the silica gel is 1g of the luminescent material dissolved in 5ml of the silica gel. Then it is coated on the glass substrate in turn (the thickness of the two layers is equivalent), and it is baked and formed, with a thickness of 0.2mm. According to the light incident direction, they are rare earth ion-doped luminescent materials and quantum dot luminescent materials. image 3 Shown is a schematic diagram of the structure.
Embodiment 3
[0036] The preparation method of the up-converter is as follows:
[0037] The prepared core / shell structure of PbS / NaYF 4 : 18%Yb 3+ ,2%Er 3+ The luminescent material and the low-temperature curing material (according to 1g of core-shell structure luminescent material mixed with 3ml of low-temperature curing material) are mixed by magnetic stirring to form a uniform gel-like mixture, and then coated on the glass substrate and baked to form a thickness of 0.2mm. The diameter of the core is 8nm, and the thickness of the shell is 200nm. Figure 4 A schematic diagram of an upconverter.
[0038] Figure 5 , Image 6 , Figure 7are the photoluminescence spectra of the novel up-converters in Examples 1, 2, and 3, respectively. It can be clearly seen that, compared with the luminescent material without quantum dots, the photoluminescence spectrum of the up-converter formed after the combination is in the corresponding region, and the luminous intensity is significantly improved...
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