• Title/Summary/Keyword: and materials

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Enhanced Photovoltaic Performance of Perovskite Solar Cells by Copper Chloride (CuCl2) as an Additive in Single Solvent Perovskite Precursor

  • Kayesh, Md. Emrul;Matsuishi, Kiyoto;Chowdhury, Towhid H.;Kaneko, Ryuji;Noda, Takeshi;Islam, Ashraful
    • Electronic Materials Letters
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    • v.14 no.6
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    • pp.712-717
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    • 2018

  • In this letter, we have introduced copper chloride ($CuCl_2$) as an additive in the $CH_3NH_3PbI_3$ precursor solution to improve the surface morphology and crystallinity of $CH_3NH_3PbI_3$ films in a single solvent system. Our optimized perovskite solar cells (PSCs) with 2.5 mol% $CuCl_2$ additive showed best power conversion efficiency (PCE) of 15.22%. The PCE of the PSCs fabricated by $CuCl_2$ (2.5 mol%) additive engineering was 56% higher than the PSC fabricated with pristine $CH_3NH_3PbI_3$.

  • https://doi.org/10.1007/s13391-018-0075-5 인용 KSCI

Chinese Research Trends in Materials Science and the Korean Countermeasure (중국의 재료과학분야 연구현황과 우리의 대응방안)

  • Noh, Kyung Ran;Kil, Sang-Cheol;Nam, Soo Woo
    • Korean Journal of Materials Research
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    • v.23 no.12
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    • pp.745-756
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    • 2013

  • Recent rapid development of the Chinese economy based on science and technology is challenging Korean industries and economy. Since the driving force for this rapid development of China is known to be scientific technologies, the purpose of this research is to confirm the current status of Chinese scientific research in the field of "Materials Science and Engineering" and propose a strategy for competition with China. Even though there are numerous journals of "Materials Science and Engineering", the 10 most popular journals with high impact factors were selected to cover general materials, nano materials, bio materials, and electronic materials. It was found that the number of scientific papers written by Chinese scientists for the materials field in the 10 journals was slowly increasing from the year 2000 until 2005, but has been rapidly increasing since 2005. This research found that Chinese research activities in the traditional metallic materials and nano materials have tremendously increased to occupy around 30 % or more papers published in several major journals related with materials science and engineering. On the other hand, bio materials and electronic materials research has not been pursued so actively; however, very recently the number of publications in these fields is also beginning to increase. To compete with this tremendously growing Chinese scientific development, Korea should have a policy of "selection and concentration" in materials-related fields, including basic science in nano, bio, and electronic materials.

  • https://doi.org/10.3740/MRSK.2013.23.12.745 인용 PDF KSCI

Development and Application of Evaluation Tool for Sexual Educational Materials (성교육 자료 평가도구 개발과 적용)

  • Yang Soon-Ok;Jeong Geum-Hee
    • Child Health Nursing Research
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    • v.9 no.4
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    • pp.408-419
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    • 2003

  • Purpose: This study was done to develop a reliable and appropriate evaluation tool for sexual educational materials and to apply it to video materials for recommendation of excellent materials. Method: The items of the content for evaluation were based on the previous studies on the sexual education and evaluation tools. After testing validity and reliability of tool, final evaluation tool for sexual educational materials was developed. The evaluation tool was applied to 84 video materials and the excellent materials were recommended. Result: The final evaluation tool for sexual educational materials which consisted of two parts was developed. One is the evaluation of basic information which includes 8 items: target population, type of materials, producer, year of production, subject, theme, running time, and guide book. The other is the evaluation of content which includes 36 items related to characteristics of material, purpose, efficiency and scope of content. After applying the tool to 84 video materials, 39 excellent sexual education materials were suggested. Conclusion: The systematic development of materials for sexual education appropriate to the specific subjects should be done. Producers should describe the basic information on the outside of materials. For recommending the excellent materials, the periodical standardized evaluation of sexual educational materials should be done, and the database of the excellent materials should be provided for further utilization.

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