{"id":67703,"date":"2020-09-15T23:50:00","date_gmt":"2020-09-15T20:50:00","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/theoretically-two-layers-are-better-than-one-for-solar-cell-efficiency\/"},"modified":"2020-09-15T23:50:00","modified_gmt":"2020-09-15T20:50:00","slug":"theoretically-two-layers-are-better-than-one-for-solar-cell-efficiency","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/theoretically-two-layers-are-better-than-one-for-solar-cell-efficiency\/","title":{"rendered":"#Theoretically, two layers are better than one for solar-cell efficiency"},"content":{"rendered":"

“#Theoretically, two layers are better than one for solar-cell efficiency<\/strong>”<\/p>\n

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\"Theoretically,<\/img>
\n Schematic of a double thin film layered solar cell. The sun enters at the top and reaches the CIGS and CZTSSe layers that absorb the light and create positive and negative particles that travel<\/a> to the top and bottom contact layers, producing electricity. Credit: Akhlesh Lakhtakia, Penn State
\n <\/figcaption><\/figure>\n<\/div>\n<\/div>\n

Solar cells have come a long way, but inexpensive, thin film solar cells are still far behind more expensive, crystalline solar cells in efficiency. Now, a team of researchers suggests that using two thin films of different materials may be the way to go to create affordable, thin film cells with about 34% efficiency.<\/p>\n

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“Ten years ago I knew very little about solar cells, but it became clear to me they were very important,” said Akhlesh Lakhtakia, Evan Pugh University Professor and Charles Godfrey Binder Professor of Engineering Science<\/a> and Mechanics, Penn State.<\/p>\n

Investigating the field, he found that researchers app<\/a>roached solar cells from two sides, the optical side\u2014looking on how the sun’s light is collected\u2014and the electrical side\u2014looking at how the collected sunlight is converted into electricity. Optical researchers strive to optimize light capture, while electrical researchers strive to optimize conversion to electricity, both sides simplifying the other.
\n“I decided to create a model in which both electrical and optical aspects will be treated equally,” said Lakhtakia. “We needed to increase actual efficiency, because if the efficiency of a cell is less than 30% it isn’t going to make a difference.” The researchers report their results in a recent issue of Applied Physics Letters<\/i>.
\nLakhtakia is a theoretician. He does not make thin films in a laboratory, but creates mathematical models to test the possibilities of configurations and materials so that others can test the results. The problem, he said, was that the mathematical structure of optimizing the optical and the electrical are very different.
\nSolar cells appear to be simple devices, he explained. A clear top layer allows sunlight to fall on an energy conversion layer. The material chosen to convert the energy, absorbs the light and produces streams of negatively charged electrons and positively charged holes moving in opposite directions. The differently charged particles get transferred to a top contact layer and a bottom contact layer that channel the electricity out of the cell for use. The amount of energy a cell can produce depends on the amount of sunlight collected and the ability of the conversion layer. Different materials react to and convert different wavelengths of light.
\n“I realized that to increase efficiency we had to absorb more light,” said Lakhtakia. “To do that we had to make the absorbent layer nonhomogeneous in a special way.”
\nThat special way was to use two different absorbent materials in two different thin films. The researchers chose commercially available CIGS\u2014copper indium gallium diselenide\u2014and CZTSSe\u2014copper zinc tin sulfur selenide\u2014 for the layers. By itself, CIGS’s efficiency is about 20% and CZTSSe’s is about 11%.
\nThese two materials work in a solar cell because the structure of both materials is the same. They have roughly the same lattice structure, so they can be grown one on top of the other, and they absorb different frequencies of the spectrum so they should increase efficiency, according to Lakhtakia.
\n“It was amazing,” said Lakhtakia. “Together they produced a solar cell with 34% efficiency. This creates a new solar cell architecture\u2014layer upon layer. Others who can actually make solar cells can find other formulations of layers and perhaps do better.”
\nAccording to the researchers, the next step is to create these experimentally and see what the options are to get the final, best answers.<\/p>\n

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More information:<\/strong>
\n Faiz Ahmad et al, Double-absorber thin-film solar cell with 34% efficiency, Applied Physics Letters<\/i> (2020). DOI: 10.1063\/5.0017916\n <\/div>\n

\n Citation<\/strong>:
\n Theoretically, two layers are better than one for solar-cell efficiency (2020, September 15)
\n retrieved 15 September 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-09-theoretically-layers-solar-cell-efficiency.html<\/p>\n

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\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n

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“#Theoretically, two layers are better than one for solar-cell efficiency” Schematic of a double thin film layered solar cell. The sun enters at the top and reaches the CIGS and CZTSSe layers that absorb the light and create positive and negative particles that travel to the top and bottom contact layers, producing electricity. Credit: Akhlesh…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[12790,69948,69949],"class_list":["post-67703","post","type-post","status-publish","format-standard","hentry","category-sciencee","tag-general-physics","tag-theoretically","tag-two-layers-are-better-than-one-for-solar-cell-efficiency"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/67703","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=67703"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/67703\/revisions"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=67703"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=67703"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=67703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}