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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>
Lee, Seojun,Cho, Jung Sang,Kang, Dong-Won Elsevier 2019 Ceramics international Vol.45 No.17
<P><B>Abstract</B></P> <P>In this study, polyethylene oxide (PEO) is introduced into methylammonium lead iodide (MAPbI<SUB>3</SUB>) perovskite to replace the standard anti-solvent washing process of perovskite solar cells. By forming PEO-MAPbI<SUB>3</SUB> composites, we achieved controllability of the perovskite surface morphology. Furthermore, the PEO addition improved the electronic properties of the composites by suppressing the trap density of the MAPbI<SUB>3</SUB> perovskite. We observed a significant increase in the average power conversion efficiency (PCE) of the perovskite solar cells (PVSCs) from 0.24% to 7.25% using the proper PEO-perovskite composition ratio (1.5:1), based on their fabrication without any organic anti-solvent treatment. Moreover, the performance uniformity and outdoor stability were significantly enhanced by employing the composite. The proposed PEO-perovskite composite offers a promising pathway for the industrialization of PVSCs in terms of PCE, uniformity, stability, and feasibility—without involving current anti-solvent washing process.</P>
Lee, Jiho,Kim, Hwayoun,Lee, Hyesun,Jang, Seojun,Chang, Jeong Ho Springer US 2016 NANOSCALE RESEARCH LETTERS Vol.11 No.1
<P>Ordered nanoporous silicas containing various binary copper-manganese oxides were prepared as catalytic systems for effective carbon monoxide elimination. The carbon monoxide elimination efficiency was demonstrated as a function of the [Mn]/[Cu] ratio and reaction time. The prepared catalysts were characterized by Brunauer-Emmett-Teller (BET) method, small- and wide-angle X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HR-TEM) for structural analysis. Moreover, quantitative analysis of the binary metal oxides within the nanoporous silica was achieved by inductively coupled plasma (ICP). The binary metal oxide-loaded nanoporous silica showed high room temperature catalytic efficiency with over 98 % elimination of carbon monoxide at higher concentration ratio of [Mn]/[Cu].</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1186/s11671-015-1197-4) contains supplementary material, which is available to authorized users.</P>
Highly Efficient and Stable Sn-Rich Perovskite Solar Cells by Introducing Bromine
Lee, Seojun,Kang, Dong-Won American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.27
<P>Compositional engineering of recently arising methylammonium (MA) lead (Pb) halide based perovskites is an essential approach for finding better perovskite compositions to resolve still remaining issues of toxic Pb, long-term instability, etc. In this work, we carried out crystallographic, morphological, optical, and photovoltaic characterization of compositional MASn(0.6)Pb(0.4)I(3-x)Br(x) by gradually introducing bromine (Br) into parental Pb-Sn binary perovskite (MASn(0.6)Pb(0.4)I(3)) to elucidate its function in Sn-rich (Sn:Pb = 6:4) perovskites. We found significant advances in crystallinity and dense coverage of the perovskite films by inserting the Br into Sn-rich perovskite lattice. Furthermore, light-intensity dependent open circuit voltage (V-oc,) measurement revealed much suppressed trap-assisted recombination for a proper Br-added (x = 0.4) device. These contributed to attaining the unprecedented power conversion efficiency of 12.1% and V-oc of 0.78 V, which are, to the best of our knowledge, the highest performance in the Sn-rich (>= 60%) perovskite solar cells reported so far. In addition, impressive enhancement of photocurrent-output stability and little hysteresis were found, which paves the way for the development of environmentally benign (Pb reduction), stable monolithic tandem cells using the developed low band gap (1.24-1.26 eV) MASn(0.6)Pb(0.4)I(3-x)Br(x) with suggested composition (x = 0.2-0.4).</P>