- 건국대학교

	Prof. Man-Jong Lee Reported the Highly-Efficient Planar Perovskite Solar Cell Using a Novel Nanocomposite Electron Selective Layer
	관리자		319		2021.01.05

<span style="white-space: normal; word-spacing: 0px; text-transform: none; font-weight: 400; color: #505050; font-style: normal; text-align: left; orphans: 2; widows: 2; letter-spacing: normal; background-color: #ffffff; text-indent: 0px; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">Publication in the one of the best SCI journal paper in Chemical Engineering <span style="white-space: normal; word-spacing: 0px; text-transform: none; font-weight: 400; color: #505050; font-style: normal; text-align: left; orphans: 2; widows: 2; letter-spacing: normal; background-color: #ffffff; text-indent: 0px; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">
The research team of Professor Man-Jong Lee of the Department of Chemistry at Konkuk University reported a new concept of amorphous electron-selective layer in a planar perovskite solar cell, achieving a stable efficiency of 21.06%. This manufacturing process was made in a room temperature air atmosphere. These results were published in the online edition of the Chemical Engineering Journal on December 31, 2020(<a href="https://doi.org/10.1016/j.cej.2020.128215">https://doi.org/10.1016/j.cej.2020.128215</a>).<span style="white-space: normal; word-spacing: 0px; text-transform: none; font-weight: 400; color: #505050; font-style: normal; text-align: left; orphans: 2; widows: 2; letter-spacing: normal; background-color: #ffffff; text-indent: 0px; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"> <img style="margin-left: auto; display: block; margin-right: auto; border: 0px;" alt="" src="ArticleFile.do?id=11810441" /> 
Solar cells are electronic devices that convert enormous energy (100 mW/cm2) incident from the sun to the earth into electricity. Currently, solar cells using silicon (Si) are commercially available. Efforts to develop new solar cells are being concentrated around the world. Among them, perovskite solar cells are counted as one of the top ten advances in the world's scientific field, and show the highest efficiency of 25% as of 2020, making it a big next-generation device that can replace silicon solar cells in terms of materials and manufacturing costs. However, there are some problems that must be overcome for global commercialization. First, devices that exceed 25%, the highest efficiency reported up to date, use an architecture based on the form of a mesoporous device. Although there is a decrease in efficiency, in order to overcome the complexity of the device structure, it must be based on a device structure of a simple planar architecture for commercialization. Second, in order to reduce defects, a mixed perovskite composition of multiple cations has been developed and has announced high efficiency, but the mixed composition is vulnerable to moisture and temperature, so expensive constant temperature and ultra-low humidity manufacturing equipment is essential. Third, TiO2 or a single SnO2 thin film, an oxide semiconductor that is widely applied as an electron selection layer, inevitably has residual stress at the interface or inside the device due to the difference in thermal expansion coefficient between the absorption layer and the transfer layer, which act as a factor for the decreased efficiency.
This study is a study that overcomes the reported shortcomings. This study adopts a planar architecture as the basic structure of the device, and a single composition of MAPbI3 perovskite that is less sensitive to temperature and humidity is selected. An AlO6-SnO2 oxide nanocomposite semiconductor, a new concept nanocomposite capable of compensating for the decrease in efficiency in a single composition, was presented as an electron transport layer, demonstrating very high efficiency and efficiency stability. Prof. Man-Jong Lee's research team verified through various techniques that an AlO6-SnO2 oxide nanocomposite semiconductor could be fabricated instead of a single-phase SnO2 thin film by adjusting the chemical composition of the starting material of the SnO2 thin film. Compared with the conventional single-phase electron transport layer, it has very excellent properties (increased electrical conductivity, reduced interfacial defects, reduced interfacial stress). The MAPbI3 single composition perovskite solar cell with a planar architecture was able to present 21.06% efficiency, one of the world's highest efficiencies using MAPbI3, and these factors were systematically analyzed.
Prof. Man-Jong Lee said, “The results of this study are the first in the world to present an effective nanocomposite electron transport layer, induce effective reduction of internal stress, and present high efficiency even with a simple perovskite composition. It is of great importance because it uses a simple process”. He also trying to apply for a patent as soon as possible.
<span style="font-size: 11pt; font-family: 굴림, Gulim, 돋음, Dotum, AppleGothic, sans-serif; white-space: normal; word-spacing: 0px; text-transform: none; font-weight: 400; color: #505050; font-style: normal; text-align: left; orphans: 2; widows: 2; letter-spacing: normal; background-color: #ffffff; text-indent: 0px; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"> <img style="margin-left: auto; display: block; margin-right: auto; border: 0px;" alt="" src="ArticleFile.do?id=11810442" /> <img style="margin-left: auto; display: block; margin-right: auto; border: 0px;" alt="" src="ArticleFile.do?id=11810443" />


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