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Nanocrystalline composite center-based stacked solar cell and preparation method thereof

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

Inactive Publication Date: 2016-06-15
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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  • Nanocrystalline composite center-based stacked solar cell and preparation method thereof
  • Nanocrystalline composite center-based stacked solar cell and preparation method thereof
  • Nanocrystalline composite center-based stacked solar cell and preparation method thereof

Examples

Experimental program
Comparison scheme
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] Reference Chia-Hao M. Chuang, Patrick R. Brown, Moungi G. Bawendi, et.al. , Nat. Mater. , 2014 , 13(8):796-801, the method for preparing lead sulfide quantum dots (particle size is 2~5nm, preferably 2.6nm), the specific process ...

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 / cm2 The power of the tandem solar cell and the single-junction sub-cell prepared in Example 1 I-V The curves 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 nanocrystalline composite center-based stacked solar cell and a preparation method thereof. Specifically, the preparation method comprises the following three steps: (1) preparation of a front sub-cell; (2) preparation of a composite center; and (3) preparation of a back sub-cell. With lead sulfide nanocrystal as a hole transport layer of the composite center, the stacked solar cell has the characteristic that a solvent method process is simple in operation and has the device stability that a traditional solvent method material is short of. A novel composite center and lead sulfide colloidal quantum dot solar cell system has the compatibility; the efficiency is much higher than that of a lead sulfide quantum dot lamination device reported at present; the temperature of the overall preparation process is controlled within 140 DEG C; the whole preparation process is carried out in air; the technology is simple; and an inert gas atmosphere is not needed. The preparation method disclosed by the invention breaks through existing technical bottlenecks, and provides a certain guidance function for further improvement of the photoelectric conversion efficiency of the device and promotion of commercialized 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 widespread attention in recent years due to their high absorption coefficient, quantum confinement effect, and multiple excitonic effects, especially in rec...

Claims

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Application Information

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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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