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Photo-annealed amorphous titanium oxide for perovskite solar cells
Jeon, Jae Bum,Kim, Byeong Jo,Bang, Gi Joo,Kim, Min-cheol,Lee, Dong Geon,Lee, Jae Myeong,Lee, Minho,han, Hyun Soo,Boschloo, Gerrit,Lee, Sangwook,Jung, Hyun Suk The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.41
<P>Electron selective layers are important to the efficiency, stability and hysteresis of perovskite solar cells. Photo-annealing is a low-cost, roll-to-roll-compatible process that can be applied to the post-treatment fabrication of sol-gel based metal oxide layers. Here, we fabricate an amorphous titanium oxide electron selective layer at a low temperature in a dry atmosphere using a UV light annealing system and compare it with a thermal annealing process. Active oxygen species are created by using UV light to promote hydrolysis and condense the TiO2 precursor, which removes organic ligands effectively. The photo-annealed TiO2-based perovskite solar cell has a power conversion efficiency of 19.37% without hysteresis.</P>
한병호 ( Han Byeong Ho ),조동휘 ( Jo Dong Hwi ),전태희 ( Jeon Tae Hui ),주기중 ( Ju Gi Jung ),이중건 ( Lee Jung Geon ),이종수 ( Lee Jong Su ),송갑영 ( Song Gab Yeong ) 대한내과학회 2003 대한내과학회지 증례 특집호 65-5 부록3 Vol.0 No.-
Typhoid fever often manifests hepatic involvement but pleural involvement has rarely been reported to occur as a complication of typhoid fever. One case of typhoid pleurisy, in which Salmonella was isolated from the blood, is presented with the brief revi
양파 수확 후 잔재물을 이용한 발효 및 열수 추출물의 생리활성과 세포독성 분석
김태원(Tae-Won Kim),이건희(Geon-Hee Lee),전병균(Byeong-Gyun Jeon),이성호(Sung-Ho Lee) 한국생명과학회 2018 생명과학회지 Vol.28 No.10
본 연구에서는 양파 수확 후 버려지는 잔재물의 활용가치를 위해 이들로부터 추출한 발효 추출물과 열수 추출물의 생리활성과 세포독성을 분석하고자 하였다. 추출물의 pH는 모두 산성을 나타내었고, 유기물 함량은 발효추출물에서 0.75%로 열수 추출물의 0.19% 보다 4배 많이 함유되었다. 다량원소 중 칼륨성분을 제외한 질소, 인산, 칼슘, 마그네슘성분의 함량은 발효 추출물에서 열수 추출물 보다 높게 나타내었고, 미량원소 중 철과 규소성분의 함량도 발효 추출물에서 열수 추출물 보다 높았으며, 반면에 붕소성분의 함량은 열수 추출물에서 발효 추출물보다 높게 검출되었다. 총 폴리페놀 함량은 발효 추출물에서 16.2±3.3 ㎎․g<SUP>-1</SUP>로 열수 추출물의 총 폴리페놀 함량인 14.6±1.4 ㎎․g<SUP>-1</SUP> 보다 1.6 ㎎․g<SUP>-1</SUP> 높게 나타내었다. 반면에 총 플라보노이드 함량은 열수 추출물에서 4.8±0.7 ㎎․g<SUP>-1</SUP>로서 발효 추출물의 함량인 0.1±0.1 ㎎․g<SUP>-1</SUP> 보다 4.7 ㎎․g<SUP>-1</SUP> 높게 나타내었다. DPPH와 ABTS radical 소거능력은 모두 열수 추출물에서 발효 추출물 보다 높은 항산화력을 보였다. MTT assay를 이용한 추출물의 세포독성 실험에서는 발효 추출물과 열수 추출물에서 각각 101.6%와 97.9%의 세포생존율을 나타내어 두 추출물 모두 세포독성이 없는 것으로 확인되었다. In order to utilize the residue that is thrown away after an onion harvest, we analyzed the physiological activity and cytotoxicity of fermented and hot water extracts of the residue. The pH of the extracts were all acidic, and organic matter content was 0.75% in the fermented extract and four times more than 0.19% in the hot water extract. The contents of nitrogen, phosphoric acid, calcium, and magnesium components, except for the potassium component among macroelements, were higher in the fermented extract than in the hot water extract. The content of iron and silicon among the microelements was also higher in the fermented extract than in the hot water extract. In addition, the content of boron was higher in the hot water extract than in the fermented extract. The total polyphenol contents of the fermented and hot water extracts were 16.2±3.3 ㎎・g<SUP>-1</SUP> and 14.6±1.4 ㎎・g<SUP>-1</SUP>, respectively, which was 1.6 mg・g<SUP>-1</SUP> higher in the fermented extract than in the hot water extract. However, the total flavonoid contents of the fermented and hot water extracts were 0.1±0.1 ㎎・g<SUP>-1</SUP> and 4.8±0.7 ㎎・g<SUP>-1</SUP>, respectively, which was 4.7 ㎎・g<SUP>-1</SUP> higher in the hot water extract than in the fermented extract. DPPH and ABTS radical scavenging ability for antioxidant activity were higher in the hot water extract than the fermented extract. The cytotoxicity of the extract using MTT assay showed cell viability of 101.6% and 97.9% in the fermented and hot water extracts, respectively. It was confirmed that there was no cytotoxicity in either extract.