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오늘 본 자료
Mohd Yusoff, Abd. Rashid bin,Kim, Dongcheon,Schneider, Fabio Kurt,da Silva, Wilson Jose,Jang, Jin The Royal Society of Chemistry 2015 ENERGY AND ENVIRONMENTAL SCIENCE Vol.8 No.5
<P>Polymer solar cells (PSCs) are apparently becoming one of the leading technologies to reduce our dependency on traditional power sources. However, the frequent use of a transparent conductive electrode, indium-tin-oxide (ITO), in the present PSC technologies has increased the overall expenses. In addition, its brittleness in nature could limit the future development of PSCs, particularly in a flexible format. Here, we report on the development of Au-doped single layer graphene nanoribbons (Au-doped SLGNRs) as an option to the transparent conducting electrode (indium tin oxide, ITO) that could yield a single-layer PSC with power conversion and external quantum efficiencies comparable to commonly used transparent electrodes. When the Au-doped SLGNRs are implemented in tandem architecture, a power conversion efficiency (PCE) of 8.48% is achieved. This is the highest efficiency for ITO-free tandem PSCs to date. The improved performance of the Au-doped SLGNR anode is characterized to the structure of the device that enables a hole transport from the active layer into the Au-doped SLGNR anode.</P>
Null current hysteresis for acetylacetonate electron extraction layer in perovskite solar cells
Mohd Yusoff, Abd. Rashid bin,Mat Teridi, Mohd Asri,Jang, Jin The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.12
<P>Solution processed zirconium acetylacetonate (Zr(acac)) is successfully employed as an electron extraction layer, replacing conventional titanium oxide, in planar CH3NH3PbI3 perovskite solar cells. The as-prepared Zr(acac) film possesses high transparency, high conductivity, a smooth morphology, high wettability, compatibility with PbI2 DMF solution, and an energy level matching that of CH3NH3PbI3 perovskite material. An average power conversion efficiency of about 11.93%, along with a high fill factor of 74.36%, an open circuit voltage of 1.03 V, and a short-circuit current density of 15.58 mA cm(-2) is achieved. The overall performance of the devices is slight better than that of cells using ruthenium acetylacetonate (Ru(acac)). The differences between solar cells with different electron extraction layers in charge recombination, charge transport and transfer and lifetime are further explored and it is demonstrate that Zr(acac) is a more effective and promising electron extraction layer. This work provides a simple, and cost effective route for the preparation of an effective hole extraction layer.</P>
Yusoff, Abd Rashid bin Mohd,Jose da Silva, Wilson,Kim, Hyeong Pil,Jang, Jin RSC Pub 2013 Nanoscale Vol.5 No.22
<P>One approach to harvest a wide solar spectral solar energy is to stack two solar cells with different absorption characteristics in a tandem cell architecture. Herein, solution processed tandem solar cells, with highly transparent titanium oxide (TiO2) and graphene oxide (GO) as an efficient recombination layer, were designed, fabricated and characterized. We have adopted poly[(4,4'-bis(3-ethylhexyl)dithieno[3,2-b:''3'-d]silole)-2,6-diyl-alt-(2,5-(3-(2-ethylhexyl)thiophen-2-yl)thiazolo[5,4-d]thiazole]:indene-C60 bisadduct (PSEHTT:ICBA) and poly[(4,4'-bis(2-ethylhexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl]:[6,6]-phenyl-C70 butyric acid methyl ester (PSBTBT:PC70BM) as the active layers for the front and rear cells, respectively. The TiO2/GO serves as an electron and hole collecting and recombination layer. The tandem solar cells showed a high open circuit voltage (VOC) 1.62 V, a moderate short circuit current density (JSC) 8.23 mA cm(-2), fill factor (FF) 62.98%, leading to the power conversion efficiency of 8.40%. The obtained VOC value of tandem solar cells is ideal for the summation of VOCs attained from front and rear cells and it is evident that our tandem solar cells are well connected in series. Moreover, this tandem cell exhibits a 20% drop in conversion efficiency under continuous AM illumination for 2880 h.</P>
Yusoff, Abd. Rashid bin Mohd,Kim, Dongcheon,Kim, Hyeong Pil,Shneider, Fabio Kurt,da Silva, Wilson Jose,Jang, Jin The Royal Society of Chemistry 2015 Energy & environmental science Vol.8 No.1
<P>High efficiency, solution-deposited polymer inverted double- and triple-junction solar cells are demonstrated. The devices are composed of three distinctive photosensitive materials in three distinct subcells, with minimal absorption spectral overlap, and with a bandgap ranging from 1.3 eV to 1.82 eV. A transparent hybrid inorganic organic mixture was introduced as an interconnecting layer to optically and physically connect the subcells. Accordingly, a power conversion efficiency of 10.39% was attained for the double-junction cell and a record high of 11.83% was obtained for the triple-junction cell.</P> <P>Graphic Abstract</P><P>We propose that 1 + 1 + 1 triple-junction solar cells can provide an increased efficiency, as well as a higher open circuit voltage, compared to tandem solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee03048f'> </P>
bin Mohd Yusoff, Abd. Rashid,Lee, Seung Joo,Kim, Jaeyeon,Shneider, Fabio Kurt,da Silva, Wilson Jose,Jang, Jin American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We demonstrated the inverted solution processed tandem polymer solar cells, in which transparent pH-neutral poly(3,4-ethylenedioxylenethiophene)–polystylene sulfonic acid (PEDOT:PSS) and lithium zinc oxide layers were used as a recombination layer. We have used poly(di(2-ethylhexyloxy)benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-<I>co</I>-octylthieno[3,4-<I>c</I>]pyrrole-4,6-dione):[6,6]-phenyl-C<SUB>61</SUB> butyric acid methyl ester (PBDTTPD:PC<SUB>61</SUB>BM) and poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-<I>b</I>:2′,3′-<I>d</I>] silole)-2,6-diyl-<I>alt</I>-(2,1,3-benzothiadiazole)-4,7-diyl]:[6,6]-phenyl-C<SUB>70</SUB> butyric acid methyl ester (PSBTBT:PC<SUB>70</SUB>BM) as the active layers for front and rear subcells, respectively. The pH-neutral PEDOT:PSS/LZO serves as an electron- and hole-collecting and recombination layer. Our tandem solar cells showed a high open circuit voltage (<I>V</I><SUB>oc</SUB>) of 1.54 V, a short circuit current density (<I>J</I><SUB>sc</SUB>) of 7.55 mA/cm<SUP>2</SUP>, and a fill factor (FF) of 64.79% along with the power conversion efficiency of 7.53%. The <I>V</I><SUB>oc</SUB> value of our tandem solar cells is an ideal summation of <I>V</I><SUB>oc</SUB> values from front and rear subcells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am5029318/production/images/medium/am-2014-029318_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5029318'>ACS Electronic Supporting Info</A></P>
Highly efficient photoelectrochemical water splitting by a hybrid tandem perovskite solar cell
Bin, Abd. Rashid,Yusoff, Mohd,Jang, Jin The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.34
<P>Herein, we show that graphene can be fully utilized to function as an electrocatalyst in highly efficient photoelectrochemical water splitting. Combining a solution-processed organic photovoltaic and the state-of-the-art perovskite solar cell in a tandem architecture yields a stable short-circuit water splitting photocurrent of similar to 7.25 mA cm(-2) under 1 sun illumination. The similar to 7.25 mA cm(-2) photocurrent corresponds to a solar-to-hydrogen efficiency of 9.02%, which is the highest efficiency yet reported for water splitting based on a hybrid tandem perovskite solar cell.</P>
Mat Teridi, Mohd Asri,Sookhakian, Mehran,Basirun, Wan Jefrey,Zakaria, R.,Schneider, Fabio Kurt,da Silva, Wilson Jose,Kim, Jaeyeon,Lee, Seung Joo,Kim, Hyeong Pil,Mohd Yusoff, Abd. Rashid bin,Jang, Jin The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.16
<▼1><▼1><P>High performance organic devices were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks.</P></▼1><▼2><P>High performance organic devices including polymer solar cells (PSCs) and light emitting diodes (PLEDs) were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks (Au NDs) in their solution-processed active/emissive layers, respectively. PSCs and PLEDs were fabricated using a low bandgap polymer and acceptor, nitrogen doped multiwalled carbon nanotubes poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (n-MWCNTs:PTB7), and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) and (4,4-<I>N</I>,<I>N</I>-dicarbazole) biphenyl (CBP) doped with tris(2-phenylpyridine) iridium(iii) (Ir(ppy)3) as active/emissive layers, respectively. We synthesized nitrogen doped graphene and used it as anodic buffer layer in both devices. The localized surface plasmon resonance (LSPR) effect from Au NDs clearly contributed to the increase in light absorption/emission in the active layers from electromagnetic field enhancement, which originated from the excited LSPR in PSCs and PLEDs. In addition to the high density of LSPR and strong exciton-SP coupling, the electroluminescent (EL) enhancement is ascribed to enhanced spontaneous emission rates. This is due to the plasmonic near-field effect induced by Au NDs. The PSCs and PLEDs exhibited 14.98% (8.08% to 9.29%) under one sun of simulated air mass 1.5 global (AM1.5G) illumination (100 mW cm<SUP>−2</SUP>) and 19.18% (8.24 to 9.82 lm W<SUP>−1</SUP>) enhancement in the power conversion efficiencies (PCEs) compared to the control devices without Au NDs.</P></▼2></▼1>