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RISS 인기검색어
- 검색키워드
- 저자 : Muhammad Jahankhan (검색결과 3 건)
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High-performance CH3NH3PbI3 inverted planar perovskite solar cells via ammonium halide additives
Muhammad Jahandar,Nasir Khan,Muhammad Jahankhan,송창은,이행근,이상규,신원석,이종철,임상혁,문상진 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Organic-inorganic hybrid perovskites have recently attracted substantial attention as a top candidate foruse as light-absorbing materials in high-efficiency, low-cost and solution-processable photovoltaicdevices owing to their excellent optoelectronic properties. Here, we fabricated inverted planar perovskitesolar cells by incorporating small amounts of ammonium halide NH4X (X = F, Cl, Br, I) additives into aCH3NH3PbI3 (MAPbI3) perovskite solution. A compact and uniform perovskite absorber layer with largeperovskite crystalline grains is realized by simply incorporating small amounts of additives and by usingan anti-solvent engineering technique to control the nucleation and crystal growth of perovskite. Theenlarged perovskite grain size with a reduced density of the grain boundaries and improved crystallinityresults in fewer charge carrier recombinations and a reduced defect density, leading to enhanced deviceefficiency (NH4F: 14.88 0.33%, NH4Cl: 16.63 0.21%, NH4Br: 16.64 0.35%, and NH4I: 17.28 0.15%)compared to that of a reference MAPbI3 device (Ref.: 12.95 0.48%) and greater device stability. Thissimple technique involving the introduction of small amounts of ammonium halide additives to regulatethe nucleation and crystal growth of perovskitefilms translates into highly reproducible enhanced deviceperformance.
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Jahandar, Muhammad,Khan, Nasir,Jahankhan, Muhammad,Song, Chang Eun,Lee, Hang Ken,Lee, Sang Kyu,Shin, Won Suk,Lee, Jong-Cheol,Im, Sang Hyuk,Moon, Sang-Jin Elsevier 2019 Journal of industrial and engineering chemistry Vol.80 No.-
<P><B>Abstract</B></P> <P>Organic-inorganic hybrid perovskites have recently attracted substantial attention as a top candidate for use as light-absorbing materials in high-efficiency, low-cost and solution-processable photovoltaic devices owing to their excellent optoelectronic properties. Here, we fabricated inverted planar perovskite solar cells by incorporating small amounts of ammonium halide NH<SUB>4</SUB>X (X=F, Cl, Br, I) additives into a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> (MAPbI<SUB>3</SUB>) perovskite solution. A compact and uniform perovskite absorber layer with large perovskite crystalline grains is realized by simply incorporating small amounts of additives and by using an anti-solvent engineering technique to control the nucleation and crystal growth of perovskite. The enlarged perovskite grain size with a reduced density of the grain boundaries and improved crystallinity results in fewer charge carrier recombinations and a reduced defect density, leading to enhanced device efficiency (NH<SUB>4</SUB>F: 14.88±0.33%, NH<SUB>4</SUB>Cl: 16.63±0.21%, NH<SUB>4</SUB>Br: 16.64±0.35%, and NH<SUB>4</SUB>I: 17.28±0.15%) compared to that of a reference MAPbI<SUB>3</SUB> device (Ref.: 12.95±0.48%) and greater device stability. This simple technique involving the introduction of small amounts of ammonium halide additives to regulate the nucleation and crystal growth of perovskite films translates into highly reproducible enhanced device performance.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Amine-Based Interfacial Engineering in Solution-Processed Organic and Perovskite Solar Cells
Rasool, Shafket,Khan, Nasir,Jahankhan, Muhammad,Kim, Da Hun,Ho, Thuy Thi,Do, Ly Thi,Song, Chang Eun,Lee, Hang Ken,Lee, Sang Kyu,Lee, Jong-Cheol,So, Won-Wook,Moon, Sang-Jin,Shin, Won Suk American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.18
<P>Solution-processed organic solar cells (OSCs) and hybrid perovskite solar cells (PvSCs) generally require appropriate transparent electrode with a low work function, which improves the electron extraction, increases the built-in potential, and suppresses charge recombinations. Hence, interfacial modifiers between the cathode and the photoactive layer play a significant role in OSCs and PvSCs, as they provide suitable energy-level alignment, leading to desirable charge carrier selectivity and suppressing charge carrier recombinations at the interfaces. Here, we present a comprehensive study of the energy-level mapping between a transparent electrode and photoactive layers to enhance the electron-transport ability by introducing amine-based interfacial modifiers (ABIMs). Among the ABIMs, polyethylenimine ethoxylated (PEIE) incorporating inverted OSCs shows enhanced power conversion efficiencies (PCEs) from 0.32 to 9.83% due to large interfacial dipole moments, leading to a well-aligned energy level between the cathode and the photoactive layer. Furthermore, we explore the versatility of the PEIE ABIM by employing different photoactive layers with fullerene derivatives, a nonfullerene acceptor, and a perovskite layer. Promisingly, inverted nonfullerene OSCs and planar n-i-p PvSCs with PEIE ABIM show outstanding PCEs of 11.88 and 17.15%, respectively.</P> [FIG OMISSION]</BR>
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