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Jahandar, Muhammad,Khan, Nasir,Lee, Hang Ken,Lee, Sang Kyu,Shin, Won Suk,Lee, Jong-Cheol,Song, Chang Eun,Moon, Sang-Jin American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.41
<P>The reduction of charge carrier recombination and intrinsic defect density in organic inorganic halide perovskite absorber materials is a prerequisite to achieving high-performance perovskite solar cells with good efficiency and stability. Here, we fabricated inverted planar perovskite solar cells by incorporation of a small amount of excess organic/inorganic halide (methylammonium iodide (CH3NH3I; MAI), formamidinium iodide (CH(NH2)(2)I; FAI), and cesium iodide (CsI)) in CH3NH3PbI3 perovskite film. Larger crystalline grains and enhanced crystallinity in CH3NH3PbI3 perovskite films with excess organic/inorganic halide reduce the charge carrier recombination and defect density, leading to enhanced device efficiency (MAI+: 14.49 +/- 0.30%, FAI+: 16.22 +/- 0.38% and CsI+: 17.52 +/- 0.56%) compared to the efficiency of a control MAPbI(3) device (MAI: 12.63 +/- 0.64%) and device stability. Especially, the incorporation of a small amount of excess CsI in MAPbI(3) perovskite film leads to a highly reproducible fill factor of over 83%, increased open-Circuit voltage (from 0.946 to 1.042 V), and short-circuit current density (from 18.43 to 20.89 mA/cm(2)).</P>
Jahandar, Muhammad,Heo, Jin Hyuck,Song, Chang Eun,Kong, Ki-Jeong,Shin, Won Suk,Lee, Jong-Cheol,Im, Sang Hyuk,Moon, Sang-Jin Elsevier 2016 Nano energy Vol.27 No.-
<P><B>Abstract</B></P> <P>By substitution of some part of PbI<SUB>2</SUB> to CuBr<SUB>2</SUB> in CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite film, we fabricated inverted indium tin oxide (ITO)/poly(3,4-ethlenedioxythiophene):poly(styrenesulphonic acid) (PEDOT: PSS)/CH<SUB>3</SUB>NH<SUB>3</SUB>I(PbI<SUB>2</SUB>)<SUB>1−X</SUB>(CuBr<SUB>2</SUB>)<SUB>X</SUB> (x=0, 0.025, 0.050, 0.075, and 0.100)/Phenyl-C61-butyric acid methyl ester (PCBM)/LiF/Al planar perovskite solar cells via solvent dripping process. Whereas the PbI<SUB>2</SUB>-DMSO<SUB>2</SUB> (DMSO:dimethyl sulfoxide) intermediate is not flowable during heat-treatment process due to the simultaneous melting and decomposition, the CuBr<SUB>2</SUB>-DMSO<SUB>2</SUB> intermediate is flowable so that the CH<SUB>3</SUB>NH<SUB>3</SUB>I(PbI<SUB>2</SUB>)<SUB>1−X</SUB>(CuBr<SUB>2</SUB>)<SUB>X</SUB> perovskite could form larger crystalline grains more reproducibly than the MAPbI<SUB>3</SUB> film. From the capacitance-voltage (C-V) characteristics and density functional theory (DFT) calculation, we could know that the conductivity of MAPbI<SUB>3</SUB> is much enhanced by CuBr<SUB>2</SUB> substitution of PbI<SUB>2</SUB> due to enhance charge carriers. Accordingly, the inverted CH<SUB>3</SUB>NH<SUB>3</SUB>I(PbI<SUB>2</SUB>)<SUB>1−X</SUB>(CuBr<SUB>2</SUB>)<SUB>X</SUB> (x=0.050) planar perovskite solar cells showed greatly improved device efficiency (average of 50 sample = 16.17 ± 0.79 %, best = 17.09 %) than the efficiency of MAPbI<SUB>3</SUB> device (average of 50 sample = 12.02 ± 0.86 %, best = 13.18 %) and did not show significant current density-voltage (J-V) hysteresis with respect to the scan direction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Efficient metal halide substituted MAI(PbI<SUB>2</SUB>)<SUB>1−X</SUB>(CuBr<SUB>2</SUB>)<SUB>X</SUB> perovskite solar cells. </LI> <LI> Formation of more stable CuBr<SUB>2</SUB>-DMSO complex intermediate than PbI<SUB>2</SUB>-DMSO. </LI> <LI> CuBr<SUB>2</SUB> substitution of PbI<SUB>2</SUB> for highly reproducible large crystalline grains. </LI> <LI> Highly reproducible current density (J<SUB>SC</SUB>) and fill factor (FF). </LI> <LI> The possibility of Cu-doping and the much enhanced conductivity of perovskite. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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.
Indoor organic photovoltaics-practicalization of self-sustainable IoT devices
( Jahandar Muhammad ),김소연,( Adi Prasetio ),임동찬 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this work, large area organic photovoltaic devices with PBTZT-stat- BDTT-8:PC71PM photoactive layer are fabricated to develop indoor power generators for low power, portable and wireless electronic devices. The better spectral matching of PBTZT-stat-BDTT-8 based photoactive absorber layer with light-emitting diode (2700K and 6500K) emission spectra translate a power conversion efficiency over 18% for single cell (0.38 ㎠) device. Whereas, power conversion efficiencies over 17% and 16% are observed for mini-module (18.63 ㎠) and sub-module (40 ㎠) under 1000 lux light-emitting diode (2700K) illumination, respectively. Finally, we demonstrated the commercially available programmable arduino boards and Bluetooth based internet of things devices integrated with organic photovoltaics to create a self-sustainable communication system that can function well under indoor environment.
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>
( Adi Prasetio ),( Jahandar Muhammad ),김소연,임동찬 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
These days, the non-fullerene (NF) acceptors replace the fullerene derivatives because of their superiority. However, NF acceptors frequently behave react with the polyethyleneimine ethoxylated (PEIE), and hence a decline in the device performance and stability could not be avoided. Herein, we demonstrated a novel strategy to mitigate the reaction between PEIE and NF acceptor by introducing the ethanedithiol self-assembled monolayer (SAM) at the PEIE/photoactive layer. As a result, the PEIE with EDT-SAM exhibits lower WF, suppressed trap-assisted recombination, and higher electron mobility compared to pristine PEIE counterparts. Consequently, the open-circuit voltage (VOC) and fill factor (FF) are drastically improved. Therefore, a significant performance enhancement was obtained for the PEIE-EDTbased devices with the power conversion efficiency (PCE) of >12% for rigid and >10% for flexible devices.