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A tandem solar cell based on a nanocrystalline composite center and its preparation method

A nanocrystalline composite, solar cell technology, applied in circuits, photovoltaic power generation, electrical components and other directions, can solve the problems of lag, complex structure and preparation process, complex preparation process of laminated devices, achieve system compatibility, reduce production costs, simple craftsmanship

Inactive Publication Date: 2017-07-07
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of its recombination center is very complicated, and it is stacked by molybdenum oxide, indium tin oxide, aluminum-doped zinc oxide and titanium oxide, and they are all prepared by magnetron sputtering.
The complex structure and preparation process lead to the research on stacked devices lagging far behind the research on single-junction colloidal quantum dot solar cells

Method used

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  • A tandem solar cell based on a nanocrystalline composite center and its preparation method
  • A tandem solar cell based on a nanocrystalline composite center and its preparation method
  • A tandem solar cell based on a nanocrystalline composite center and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] Example 1: Preparation of stacked solar cells.

[0058] (1) Preparation of the front sub-battery:

[0059] Use deionized water, isopropanol, and acetone to ultrasonically clean the ITO conductive glass in sequence, and set aside. Weigh zinc acetate dihydrate (220 mg), 2-methoxyethanol (2 mL) and ethanolamine (60 μL), mix and stir for 5 min to obtain a zinc oxide precursor solution, which is then spin-coated on the cleaned surface at a speed of 4000 rpm. On the ITO conductive glass, anneal at 140°C for 10min at 90%RH (according to figure 1 The results shown in the selection of the best humidity (90%RH) and annealing temperature (140 ℃)), to obtain a 50nm thick sol-gel zinc oxide layer (such as figure 2 shown in the s-ZnO layer).

[0060] With reference to the method recorded in Chia-Hao M. Chuang, Patrick R. Brown, Moungi G. Bawendi, et.al., Nat. Mater., 2014, 13 (8): 796-801, lead sulfide quantum dots (particle size 2~5nm, preferably 2.6nm), the specific process is...

Embodiment 2

[0071] Example 2: Photoelectric performance of tandem solar cells.

[0072] Under AM1.5 simulated light source (calibrated with NREL-certified standard silicon cells), at 100mW / cm 2The power of the tandem solar cell prepared in Example 1 and the I-V curve of the single sub-cell are compared and tested, and the results are as follows image 3 and shown in Table 1.

[0073] It can be seen that the difference between the open circuit voltage Voc of the laminated battery connected through the nanocrystalline recombination center and the sum of the Voc of the front and rear sub-batteries is only 0.01V, which shows its high efficiency as a recombination center. Moreover, the overall photoelectric conversion efficiency of stacked devices is higher than that of single-junction cells, indicating that the stacked device structure is an effective way to improve the photoelectric conversion efficiency of nanocrystalline solar cells.

[0074]

Embodiment 3

[0075] Embodiment 3: Stability test of laminated batteries.

[0076] In order to investigate the stability of laminated batteries, long-term stability tests were carried out on unpackaged devices, and the results were as follows: Figure 4 shown.

[0077] From Figure 4 It can be seen that the tandem cell based on the PbS-EDT / Au / ZnO composite center in the present invention basically maintained the initial photoelectric conversion efficiency during the test period of up to 60 days, while the PEDOT used in the traditional solvent method / ZnO recombination center devices have experienced a sudden drop in photoelectric conversion efficiency within a test period of about 15 days. It can be seen that the tandem solar cell based on the nanocrystalline recombination center in the present invention has excellent air stability.

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Abstract

The invention discloses a laminated solar cell based on a nanocrystal composite center and a preparation method thereof. Specifically, the preparation method includes the following three steps: 1) preparation of the front sub-cell; 2) preparation of the recombination center; and 3) preparation of the rear sub-cell. The invention uses lead sulfide nanocrystals as the hole transport layer of the recombination center, which not only has the characteristics of simple operation of the solvent method, but also has the device stability that the traditional solvent method material lacks; the new recombination center and lead sulfide colloidal quantum dot solar cell The system is more compatible, and its efficiency is much higher than that of the reported lead sulfide quantum dot stack device; the temperature of the whole preparation process is controlled within 140 ° C, and it is all carried out in the air. The process is simple and does not require an inert gas atmosphere. The preparation method of the invention breaks through the existing technical bottleneck, and provides a certain guiding role for further improving the photoelectric conversion efficiency of the device and promoting its commercial development.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic materials, and in particular relates to a laminated solar cell based on a nanocrystalline composite center and a preparation method thereof. Background technique [0002] The solvent method is a very promising photovoltaic device preparation technology, which can effectively reduce production costs and obtain flexible, large-area, and lightweight next-generation photovoltaic devices. However, for most existing photovoltaic materials compatible with solvent-based processes, there are inevitably disadvantages such as short device life, high material cost, and the need for an inert gas atmosphere during the preparation process. [0003] Colloidal quantum dots (Colloidal Quantum Dots, CQDs), also known as colloidal nanocrystals, have received extensive attention in recent years due to their high absorption coefficient, quantum confinement effect, and multiple exciton effects, especially in recent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0296H01L31/032H01L31/0352H01L31/0725H01L31/18
CPCH01L31/0296H01L31/0324H01L31/035218H01L31/0725H01L31/18Y02E10/50Y02P70/50
Inventor 马万里史国钲
Owner SUZHOU UNIV
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