Inkjet solar cell

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Inkjet solar cells are solar cells manufactured by low-cost, high tech methods that use an inkjet printer to lay down the semiconductor material and the electrodes onto a solar cell substrate.

Contents

This approach is being developed independently at various locations including the University of New South Wales, [1] [2] Oregon State University, [3] Massachusetts Institute of Technology, [4] and Saule Technologies [5] Since the appearance of perovskite solar cells, and their rapid growth in research cell efficiency [6] there is a renewed interest in the development of inkjet printed solar cells, due to their nature of being solution processable. [7]

History

The first case of printed electronics was seen in 1903 when Albert Hanson filed a patent for "printed" wire. After that the radio drove the industry of printed electronics forward. Until recently inkjet printers have not been used in the printed electronics industry. Industry has decided to move towards inkjet printing because of its low cost and flexibility of use. [8] One of these used is the inkjet solar cell. The first instance of constructing a solar cell with an inkjet printer was by Konarka in 2008. [9] In 2011 Oregon State University was able to discover a way to create CIGS solar cells using an inkjet printer. In the same year MIT was able to create a solar cell using an inkjet printer on paper. The use of an inkjet printer to make solar cells is very new and is still being researched. [10] In 2014, Olga Malinkiewicz presented her inkjet printing manufacturing process for perovskite sheets in Boston (USA) during the MRS fall meeting - for which she received MIT Technology review's innovators under 35 award. [11]

How they are made

In general inkjet solar cells are made by using an inkjet printer to put down the semiconductor material and electrodes onto a solar cell substrate. [12] Both organic and inorganic solar cells can be made using the inkjet method. Inkjet printed inorganic solar cells are mainly CIGS solar cells. The organic solar cells are polymer solar cells. The inkjet printing of hybrid perovskite solar cells is also possible. The most important component of the ink is the functional material: a metal salt mixture (CIGS), a polymer fullerene blend (polymer solar cells) or a precursor of mixed organic and inorganic salts (perovskite solar cells). These components are dissolved in an appropriate solvent. Additional components might be added to affect the viscosity and the surface tension of the ink for improved printability and wetting on the substrate. The ink is contained in a cartridge from where it is transferred onto a substrate which can vary. The printing is accomplished usually by a piezoelectric driver in the nozzles of the printhead, that is programmed to apply pre-set patterns of pressure to eject droplets. In most cases several layers of functional materials are deposited on top of each other to generate a working solar cell. The entire printing process can be done in ambient conditions, though in most cases further heat treatments are needed. Important factors for the efficiency of inkjet printed organic solar cells are the inkjet latency time, the inkjet printing table temperature, and the effect of the chemical properties of the polymer donor. [13] [14] [15]

Advantages

The main advantage to printing solar cells with an inkjet printer is the low cost of production. The reason it is cheaper than other methods is because no vacuum is necessary which makes the equipment cheaper. Also, the ink is a low cost metal salt blend reducing the cost of the solar cells. There is very little waste of material in comparison to other methods like vapor phase deposition when using inkjet printers to lay down the semiconductor material. This is because the printer is able to create precise patterning with little waste. Some inkjet solar cells use the material CIGS which has more solar efficiency than the traditional silicon solar panels. Using CIGS makes it very important to have little waste due to how rare some of the materials in it are. This method is also environmentally friendly because it does not require the use of toxic chemicals to prepare the solar cell like other methods do. [10] [15]

Disadvantages

The efficiency of inkjet solar cells are too low to be commercially viable. Even if the efficiency gets better the materials used for the solar cells could be a problem. Indium is a rare material used in these cells and could be gone within 15 years according to our current usage. Another issue is creating a weather resistant ink that can survive harsh conditions. [16] [17]

Potential

In traditional solar cells the material that holds the photovoltaic material generally costs more than the material itself. With inkjet printing it is possible to print solar cells on paper. This will allow solar cells to be much cheaper and be placed almost anywhere. Paper thin solar cells or eventually direct 3D printing will allow to create solar cells on blinds, in windows, in curtains, and almost anywhere in the home. This is very promising and could be the future of solar power. [18]

See also

- Perovskite solar cell
- CIGS solar cell
- Organic solar cell

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<span class="mw-page-title-main">Nanocrystal solar cell</span>

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<span class="mw-page-title-main">CZTS</span> Chemical compound

Copper zinc tin sulfide (CZTS) is a quaternary semiconducting compound which has received increasing interest since the late 2000s for applications in thin film solar cells. The class of related materials includes other I2-II-IV-VI4 such as copper zinc tin selenide (CZTSe) and the sulfur-selenium alloy CZTSSe. CZTS offers favorable optical and electronic properties similar to CIGS (copper indium gallium selenide), making it well suited for use as a thin-film solar cell absorber layer, but unlike CIGS (or other thin films such as CdTe), CZTS is composed of only abundant and non-toxic elements. Concerns with the price and availability of indium in CIGS and tellurium in CdTe, as well as toxicity of cadmium have been a large motivator to search for alternative thin film solar cell materials. The power conversion efficiency of CZTS is still considerably lower than CIGS and CdTe, with laboratory cell records of 11.0 % for CZTS and 12.6 % for CZTSSe as of 2019.

<span class="mw-page-title-main">Perovskite solar cell</span> Alternative to silicon-based photovoltaics

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<span class="mw-page-title-main">Polymer-fullerene bulk heterojunction solar cell</span>

Polymer-fullerene bulk heterojunction solar cells are a type of solar cell researched in academic laboratories. Polymer-fullerene solar cells are a subset of organic solar cells, also known as organic photovoltaic (OPV) cells, which use organic materials as their active component to convert solar radiation into electrical energy. The polymer, which functions as the donor material in these solar cells, and fullerene derivatives, which function as the acceptor material, are essential components. Specifically, fullerene derivatives act as electron acceptors for donor materials like P3HT, creating a polymer-fullerene based photovoltaic cell. The Polymer-fullerene BHJ forms two channels for transferring electrons and holes to the corresponding electrodes, as opposed to the planar architecture when the Acceptor (A) and Donor (D) materials were sequentially stacked on top of each other and could selectively touch the cathode and anode electrodes. Hence, the D and A domains are expected to form a bi-continuous network with Nano-scale morphology for efficient charge transport and collection after exciton dissociation. Therefore, in the BHJ device architecture, a mixture of D and A molecules in the same or different solvents was used to form a bi-continual layer, which serves as the active layer of the device that absorbs light for exciton generation. The bi-continuous three-dimensional interpenetrating network of the BHJ design generates a greater D-A interface, which is necessary for effective exciton dissociation in the BHJ due to short exciton diffusion. When compared to the prior bilayer design, photo-generated excitons may dissociate into free holes and electrons more effectively, resulting in better charge separation for improved performance of the cell.

<span class="mw-page-title-main">Olga Malinkiewicz</span> Polish physicist (born 1982)

Olga Malinkiewicz is a Polish physicist, inventor of a method of producing solar cells based on perovskites using inkjet printing. She is a co-founder and the Chief Technology Officer at Saule Technologies.

References

  1. ↑ Smith, Deborah (2008-08-20). "Thinking outside the square finds light in oven". The Sydney Morning Herald . Retrieved 2008-08-23.
  2. ↑ Lennon, Alison J.; Utama, Roland Y.; et al. (2008). "Forming openings to semiconductor layers of silicon solar cells by inkjet printing". Solar Energy Materials and Solar Cells. 92 (11): 1410–1415. doi:10.1016/j.solmat.2008.05.018.
  3. ↑ "BBC News - Scientists use inkjet printing to produce solar cells". bbc.co.uk. 2012. Retrieved 20 February 2012.
  4. ↑ Chandler, David L. (2012). "While you're up, print me a solar cell - MIT News Office". web.mit.edu. Retrieved 20 February 2012.
  5. ↑ EMILIA WEDZIUK (15 March 2016). "Perovskite revolution in the air - ITKeyMedia". itkey.media.
  6. ↑ "NREL efficiency chart". National Renewable Energy Laboratory (NREL). Retrieved 4 August 2017.
  7. ↑ Snaith, Henry J. (2013). "Perovskites: The Emergence of a New Era for Low-Cost, High-Efficiency Solar Cells". The Journal of Physical Chemistry Letters. 4 (21): 3623–3630. doi:10.1021/jz4020162.
  8. ↑ Savastano, David. "Inkjet is Making Gains in Printed Electronics". Printed Electronics Now. Archived from the original on 30 October 2012. Retrieved 16 February 2013.
  9. ↑ "Konarka Announces First-Ever Demonstration of Inkjet Printed Solar Cells". Konarka. Retrieved 16 February 2013.
  10. 1 2 "INKJET PRINTING COULD CHANGE THE FACE OF SOLAR ENERGY INDUSTRY". Oregon State University. Retrieved 25 February 2013.
  11. ↑ "Olga Malinkiewicz | Innovators Under 35". innovatorsunder35.com. 2015. Archived from the original on 2017-08-02. Retrieved 2017-08-04.
  12. ↑ Lampert, C.M. (November 2008). "Forming openings to semiconductor layers of silicon solar cells by inkjet printing". Solar Energy Materials & Solar Cells. 92 (11): 1410–1415. doi:10.1016/j.solmat.2008.05.018.
  13. ↑ Hoth, Claudia; Pavel Schilinsky; Stelios A. Choulis; Christoph J. Brabec (August 7, 2008). "Printing Highly Efficient Organic Solar Cells". Nano Letters. 8 (9): 2806–2813. Bibcode:2008NanoL...8.2806H. CiteSeerX   10.1.1.578.5674 . doi:10.1021/nl801365k. PMID   18683989.
  14. ↑ Aernouts, T (25 January 2008). "Polymer based organic solar cells using ink-jet printed active layers" (PDF). Applied Physics Letters. ORGANIC ELECTRONICS AND PHOTONICS. 92 (3): 033306. Bibcode:2008ApPhL..92c3306A. doi:10.1063/1.2833185.
  15. 1 2 Wang, Wei (September 2011). "Inkjet printed chalcopyrite CuInxGa1−xSe2 thin film solar cells". Solar Energy Materials and Solar Cells. 95 (9): 2616–2620. doi:10.1016/j.solmat.2011.05.011.
  16. ↑ Rhodes, Chris. "14% Efficiency for Thin-Film Solar Cells, but Where Will the Indium Come From?". Forbes. Retrieved 4 February 2013.
  17. ↑ Seidman, Bianca. "Inkjet printing solar panels: cheap and almost green". PBS. Retrieved 4 February 2013.
  18. ↑ Chandler, David. "While you're up, print me a solar cell". MIT. Retrieved 4 February 2013.
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