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Ameen, Sadia,Akhtar, M. Shaheer,Nazim, M.,Kim, Eun-Bi,Nazeeruddin, Mohammad Khaja,Shin, Hyung-Shik Elsevier 2019 ELECTROCHIMICA ACTA Vol.319 No.-
<P><B>Abstract</B></P> <P>Inverted planar heterojunction solar cells (iPHSCs) were fabricated with novel spiro-bifluorene (CF-Sp-BTh) based hole transport material (HTM) and graphene oxide (GO) modified perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>) as sensitizer. CF-Sp-BTh exhibited relatively high hole mobility and favorable HOMO level with respect to the valence band of CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>. iPHSC using CF-Sp-BTh HTM and GO (0.5 wt%)-CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> achieved the power conversion efficiency (PCE) of ∼14.28%, with open circuit voltage (V<SUB>OC</SUB>) of ∼1.07 V and a short circuit current density (J<SUB>SC</SUB>) of ∼18.82 mA/cm<SUP>2</SUP>. The photovoltaic performance of FTO/CF-Sp-BTh/GO (0.5 wt%)-CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>/PC<SUB>61</SUB>BM/Au was higher compared to pristine CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> and other GO-CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> hybrid based devices. The photoluminescence decay and electrochemical impedance spectra confirmed an enhanced charge separation and retarded charge recombination of GO-CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> hybrid based iPHSCs.</P>
Sadia Ameen,Vazid Ali,M. Zulfequar,M. Mazharul Haq,M. Husain 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Polyaniline has been synthesized and is doped with sodium thiosulphate. The doping of polyaniline (PANI) is done at two different time periods and DC conductivity is measured to see the effect of dopant. It has been observed that the crystallinity of PANI increases through doping which ultimately increases the conductivity. The conductivity result shows that the conduction is taking place through hopping process due to wide range of localized states present near the fermi level. Structural changes due to interaction of dopant species with PANI are studied through FTIR. Polyaniline has been synthesized and is doped with sodium thiosulphate. The doping of polyaniline (PANI) is done at two different time periods and DC conductivity is measured to see the effect of dopant. It has been observed that the crystallinity of PANI increases through doping which ultimately increases the conductivity. The conductivity result shows that the conduction is taking place through hopping process due to wide range of localized states present near the fermi level. Structural changes due to interaction of dopant species with PANI are studied through FTIR.
Ameen, Sadia,Akhtar, M. Shaheer,Seo, Hyung-Kee,Nazeeruddin, Mohammad Khaja,Shin, Hyung-Shik The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.14
<P>In this work, the effects of a titanium (Ti) layer on the charge transport and recombination rates of flexible perovskite solar cells were studied. Ti as an efficient barrier layer was deposited directly on PET-ITO flexible substrates through RF magnetic sputtering using a Ti-source and a pressure of ∼5 mTorr. A Ti coated PET-ITO was used for the fabrication of a flexible perovskite solar cell without using any metal oxide layer. The fabricated flexible perovskite solar cell was composed of a PET-ITO/Ti/perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>)/organic hole transport layer of 2,2′,7,7′-tetrakis [<I>N</I>,<I>N</I>′-di-<I>p</I>-methoxyphenylamine]-9,9′-spirobifluorene (spiro-OMeTAD)-Li-TFSI/Ag. A high conversion efficiency of ∼8.39% along with a high short circuit current (<I>J</I><SUB>SC</SUB>) of ∼15.24 mA cm<SUP>−2</SUP>, an open circuit voltage (<I>V</I><SUB>OC</SUB>) of ∼0.830 V and a high fill factor (FF) of ∼0.66 was accomplished by the fabricated flexible perovskite solar cell under a light illumination of ∼100 mW cm<SUP>−2</SUP> (1.5 AM). Intensity-modulated photocurrent (IMPS)/photovoltage spectroscopy (IMVS) studies demonstrated that the fabricated flexible perovskite solar cell considerably reduced the recombination rate.</P> <P>Graphic Abstract</P><P>The effects of a titanium (Ti) layer on the charge transport and recombination rates of flexible perovskite solar cells were studied. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt03920c'> </P>
Electrical conductivity and dielectric properties of sulfamic acid doped polyaniline
Sadia Ameen,Vazid Ali,M. Zulfequar,M. Mazharul Haq,M. Husain 한국물리학회 2007 Current Applied Physics Vol.7 No.2
The temperature and frequency dependence of dielectric constant (e0) and dielectric loss (e00) is studied for dierent samples of poly-aniline (PANI), doped with dierent concentration of sulfamic acid in the frequency range (10100 kHz) and temperature range (300by the propagation of polaron through a conjugated polymer chain due to shifting of double bonds (alternation), which gives rise toelectrical conduction.
Ameen, Sadia,Akhtar, M. Shaheer,Seo, Hyung-Kee,Shin, Hyung-Shik American Chemical Society 2014 Langmuir Vol.30 No.43
<P>A high performance perovskite solar cell was fabricated using the distinguished morphology of polyaniline nanoparticles (PANI-NPs) as an efficient hole transporting layer (HTL) with methylammonium lead iodide perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>) as sensitizer. PANI-NPs were simply synthesized by the oxidative chemical polymerization of aniline monomer at 0–5 °C. A reasonable solar-to-electricity conversion efficiency of ∼6.29% with a high short circuit current (<I>J</I><SUB>SC</SUB>) of ∼17.97 mA/cm<SUP>2</SUP> and open circuit voltage (<I>V</I><SUB>OC</SUB>) of ∼0.877 V were accomplished by Ag/PANI-NPs/CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>/mp-anatase-TiO<SUB>2</SUB>/bl-TiO<SUB>2</SUB>/FTO perovskite solar cell. The transient photocurrent and photovoltage studies revealed that the fabricated solar cell showed better charge transport time, diffusion coefficient, diffusion length, and charge collection efficiency. Herein, the use of PANI-NPs as the HTL improved the charge carrier generation and the charge collection efficiency of the fabricated solar cell.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2014/langd5.2014.30.issue-43/la502398x/production/images/medium/la-2014-02398x_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la502398x'>ACS Electronic Supporting Info</A></P>
Sadia Ameen,신형식,송민우,김돈규,임유빈,서형기,김영순 한국고분자학회 2012 Macromolecular Research Vol.20 No.1
The deposition of undoped and iodine (I2)-doped polyaniline (PANI) on TiO2 thin film was carried out using plasma-enhanced chemical vapor deposition (PECVD) under different power inputs for the fabrication of p-polyaniline/n-TiO2 heterostructure devices. The increment in the size of TiO2 nanoparticles was observed after I2doping by PECVD. The crystalline properties were altered upon I2 doping, suggesting a subtractive interaction between PANI and I2 moieties during PECVD. The significant changes in the structural and optical properties confirmed the I2 doping of PANI with strong bonding to the TiO2 nanomaterials. The existence of hydrogen bonding between the imine (-NH) of PANI and the hydroxyl (-OH) group of TiO2 nanomaterials was investigated by X-ray photoelectron spectroscopy characterization. A device fabricated by PANI/TiO2 or I2-PANI/TiO2 thin film with a top platinum (Pt) layer exhibited nonlinear behavior of current (I)-voltage (V) curve, i.e., moderate diode behavior. Compared to the Pt/PANI/TiO2 heterostructure device, the Pt/I2-PANI/TiO2 heterostructure device showed improved I-V properties with a considerably higher current of 0.050 mA, which might be attributed to the I2 doping-induced generation of large numbers of polarons in the PANI bandgap.