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RISS 인기검색어
- 검색키워드
- 저자 : Seojun Ha (검색결과 4 건)
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- 유료
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Mixed-halide Pb-Sn binary perovskite films with various Sn-content for Pb-reduced solar cells
Lee, Seojun,Ha, Tae-Jun,Kang, Dong-Won Elsevier 2018 Materials letters Vol.227 No.-
<P><B>Abstract</B></P> <P>We proposed and examined a material group of methylammonium Pb-Sn mixed halide (MAPb<SUB>1−x</SUB>Sn<SUB>x</SUB>I<SUB>2.6</SUB>Br<SUB>0.4</SUB>) with various Sn-content (x = 0.2–0.8) for Pb-reduced perovskite solar cells. With suitable Pb-Sn ratio (x = 0.4–0.6), dense coverage of films with better crystallinity was obtained compared with low Sn ratio (x = 0.2). For excess Sn ratio (x = 0.8), poor film-uniformity was found in spite of its enhanced crystallinity. Optimum composition (x = 0.6) provided an impressive power conversion efficiency of 13.4% with remarkable photocurrent output stability, which is related to suppression of trap-assisted recombination regarding the perovskite materials. This promising material paves the way for development of highly efficient, Pb-reduced perovskite photovoltaic cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We proposed Pb-Sn binary mixed halide (MAPb<SUB>1−x</SUB>Sn<SUB>x</SUB>I<SUB>2.6</SUB>Br<SUB>0.4</SUB>) perovskites. </LI> <LI> Optimum composition (x = 0.6) provided an impressive PCE of solar cell up to 13.4% </LI> <LI> It also showed remarkable photocurrent output stability and little hysteresis. </LI> <LI> The promising material suits well for Pb-reduced, eco-friend perovskite solar cells. </LI> </UL> </P>
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Improved Stability in Perovskite Solar Cells by Solution-Processed Fluorocarbon Passivation
Kang, Byeong-Cheol,Lee, Seojun,Kang, Dong-Won,Ha, Tae-Jun IEEE 2018 IEEE electron device letters Vol.39 No.6
<P>Since the first demonstration of perovskite solar cells (PSCs) was reported, there have been many efforts to improve the stability by investigating the degradation mechanism. This is because PSCs are considerably vulnerable to the moisture in air. In this letter, we demonstrate highly stable and robust PSCs employing the stack structure by solution-processed fluorocarbon films as a passivation layer, Teflon-AF which exhibits high hydrophobicity for efficient removal of water molecules. Material characterization using x-ray diffraction proves that the improved stability of PSCs under harsh humidity (70%) results from the effective and practical passivation that suppresses the chemical interaction of perovskite films with water molecules. It must be noted that the proposed passivation can be realized by simple spin-coating methods at low temperature of 70 °C, which can open up a promising route to raise the technological interest in the process cost and temperature.</P>
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Park, Ban-Suk,Lee, Seojun,Yoon, Saemon,Ha, Tae-Jun,Kang, Dong-Won Elsevier BV * North-Holland 2018 Applied Surface Science Vol.427 No.2
<P><B>Abstract</B></P> <P>In this work, we propose a new mixed halide precursor composition for MAPbI<SUB>3-x</SUB>Cl<SUB>x</SUB> organic/inorganic perovskite (PRV) solar cells. PRV films made with a new precursor composition of (MAI: PbCl<SUB>2</SUB>: PbI<SUB>2</SUB> =2:1:1) could be crystallized at lower temperature (70°C) and shorter annealing duration (60min), whereas previous standard composition (MAI: PbCl<SUB>2</SUB> =3:1) requires multi-step and high temperature (from 75°C to 130°C) annealing for longer durations (∼100min). By adopting the suggested composition, much uniform surface morphology of PRV light harvester was obtained even though non-polar solvent washing was not introduced yet. Also, when the suitable toluene washing treatment was introduced, PRV surfaces of highly compact and large crystallites with regular distribution were achieved without any pinhole, which offered significant improvements in fill factor (41→65%) and power conversion efficiency (5.85→9.39%) of PRV cells. The suggested new precursor composition contributing for surface topography can be widely utilized for inverted planar PRV devices with low-temperature and simple processing.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new precursor composition for mixed halide perovskite (PRV) was suggested. </LI> <LI> We propose MAPbI<SUB>3-x</SUB>Cl<SUB>x</SUB> PRV made with (MAI: PbCl<SUB>2</SUB>: PbI<SUB>2</SUB> =2:1:1). </LI> <LI> The new PRV showed much uniform and offered better performance in devices. </LI> <LI> The new mixed halide PRV can be made at simple step (low temperature and short annealing duration). </LI> <LI> Additional toluene washing treatment contributed to achieve PRV cell efficiency from 5.85% to 9.39%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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