http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Banyan Root Structured Mg-Doped ZnO Photoanode Dye-Sensitized Solar Cells
Raj, C. Justin,Prabakar, Kandasamy,Karthick, S. N.,Hemalatha, K. V.,Son, Min-Kyu,Kim, Hee-Je American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.6
<P>We report a peculiar banyan root like Mg-doped ZnO photoanode to result in high electron transport, retardation of interfacial charge recombination, improved light harvesting efficiency, and overall enhanced photovoltaic performance of dye-sensitized solar cells (DSSC). DSSC based on a 5 mol % Mg-doped ZnO electrode of very low thickness, ∼4 μm, gained an improved short-circuit current density of 9.98 mAcm<SUP>–2</SUP>, open-circuit photo voltage of 0.71 V, fill factor of 0.58, and overall conversion efficiency of 4.11% under 1 sun illumination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-6/jp308847g/production/images/medium/jp-2012-08847g_0011.gif'></P>
Optical and electrical properties of ZnO doped with nitrogen
Kang, Seungmo,Shin, Kyoungchul,Prabakar, Kandasamy,Lee, Chongmu WILEY-VCH Verlag 2004 Physica status solidi. PSS. B, Basic solid state p Vol.241 No.12
<P>Ultraviolet (UV) and visible photoluminescence (PL) has been achieved at room temperature from ZnO films deposited on the sapphire substrate by RF-magnetron sputtering. The electrical and optical properties of as-deposited and annealed films were investigated as a function of N<SUB>2</SUB>O/Ar gas flow ratio. All the ZnO films deposited by sputtering show a typical hexagonal wurtzite crystallographic orientation with a c-axis perpendicular to the substrate surface. The growth rate decreases with the increase of the gas flow ratio. The high carrier mobility and low resistivity films were prepared at a N<SUB>2</SUB>O/Ar gas flow ratio of 0.33. The most intense UV and week blue luminescence was observed for the as-deposited films. A strong blue luminescence emission due to oxygen vacancies was obtained from the films annealed at 1000 °C. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Chinnadurai, Deviprasath,Kim, Hee-Je,Karupannan, Senthil,Prabakar, Kandasamy CNRS 2019 NEW JOURNAL OF CHEMISTRY Vol.43 No.8
<P>Herein, a facile aqueous method was used to prepare multiscale honeycomb-structured activated carbon from mandarin peels using KOH and NaOH as activation agents, and the prepared multiscale honeycomb-structured activated carbon was carbonized under a nitrogen and argon atmosphere. All samples possessed nitrogen due to its natural abundance and exhibited enhanced specific capacitance, whereas metallic sodium (Na)-intercalated samples, which were formed due to NaOH activation, showed large pore size with increased intercalation capacitance although their surface area was reduced. Potassium has been additionally intercalated during cycling in a KOH solution and helped to sustain the micro/mesoporous honeycomb structure as well as increased the number of O-CO bonds with a concomitant reduction in the number of C-C and CC bonds. The honeycomb carbon retains up to 98% of its initial capacitance even after 7000 cycles. The presence of multiscale porosity in the interconnected carbon network structure enhances the reversible adsorption/desorption of ions in the Helmholtz double layer and hence results in high storage capacity and rate capability of the supercapacitors. The highest energy density of 10.92 W h kg<SUP>−1</SUP> at the power density of 240 W kg<SUP>−1</SUP> has been achieved and maintained up to 7.06 W h kg<SUP>−1</SUP> at the higher power density of 1740 W kg<SUP>−1</SUP>. A detailed kinetic study has been employed to better understand the specific capacitance contribution in symmetrical supercapacitors.</P>
Interplay between Iodide and Tin Vacancies in CsSnI<sub>3</sub> Perovskite Solar Cells
Rajendra Kumar, G.,Kim, Hee-Je,Karupannan, Senthil,Prabakar, Kandasamy American Chemical Society 2017 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.121 No.30
<P>Tin -based perovskite materials have the drawbacks of high density of Sn vacancies, structural deformations of SnI6- octahedra, and oxidation of unstable Sn2+ states, resulting in poor chemical stability processed at inert and open atmosphere. In this work, we demonstrate the temperature effects on reduction of Sn vacancies (V-sn) in polymorphic CsSnI3 perovskite solar cells. Evidence of light-induced I- ion diffusion and an interplay between iodide and Sn vacancies were briefly presented. We have observed by X-ray photoelectron spectroscopy that the formation of iodide vacancies (V-I) are highly activated at 60 degrees C, contributing to the reduction of acceptor defects, mainly Sn vacancies (V-sn). The formation of SnO- and SnO2- at high temperature mitigates the Sn-I interaction and eventually increases the trap density at Au/CsSnI3 interfaces. We have observed by time-of-flight secondary ion mass spectrometry that the delocalized r ions are accumulated near the metal contacts and form AuI- ions which diffuse through the material, inhibiting the exciton transport.</P>
Lee, Dong-Gil,Hong, Ji-Tae,Son, Min-Kyu,Lee, Kyoung-Jun,Xu, Guo-Cheng,Prabakar, Kandasamy,Kim, Hee-je Royal Swedish Academy of Sciences 2010 Physica scripta Vol.2010 No.t139
<P>TiO<SUB>2</SUB> nanofiber films were prepared by a homemade electrostatic spray method at 13 kV using a high power supply. As-prepared TiO<SUB>2</SUB> was used to sterilize enteropathogenic <I>Escherichia coli</I> in polluted water by using near-UV LEDs at three different wavelengths with variable exposure time and frequency of irradiation. Irrespective of the wavelength of the light source used, longer irradiation times such as 1 h completely inactivated the <I>E. coli</I>. However, a wavelength of 375 nm was effective in inactivating in a shorter irradiation time (15 min). When the frequency of irradiation was 1 kHz, almost 95% of the <I>E. coli</I> was inactivated after 30 min exposure.</P>