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RISS 인기검색어
- 검색키워드
- 저자 : Dualeh, Amalie (검색결과 3 건)
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Thermal Behavior of Methylammonium Lead-Trihalide Perovskite Photovoltaic Light Harvesters
Dualeh, Amalie,Gao, Peng,Seok, Sang Il,Nazeeruddin, Mohammad Khaja,Grä,tzel, Michael American Chemical Society 2014 Chemistry of materials Vol.26 No.21
<P>Recently organic–inorganic hybrid perovskites have attracted attention as light harvesting materials in mesoscopic cells. While a considerable number of deposition and formation methods have been reported for the perovskite crystalline material, most involve an annealing step. As such, the thermal behavior of this material and its individual components is of crucial interest. Here, we examine the thermal properties of the CH<SUB>3</SUB>NH<SUB>3</SUB>PbX<SUB>3</SUB> (X = I or Cl) perovskite using thermogravimetric analysis. The role of the precursors is exposed, and the effect of the formation of excess organic species is investigated. The sublimation behavior of the organic component is intensively scrutinized. Furthermore, differential scanning calorimetry is employed to probe the crystal phase structure, revealing subtle differences depending on the deposition method.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-21/cm502468k/production/images/medium/cm-2014-02468k_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm502468k'>ACS Electronic Supporting Info</A></P>
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Dualeh, Amalie,De Angelis, Filippo,Fantacci, Simona,Moehl, Thomas,Yi, Chenyi,Kessler, Florian,Baranoff, Etienne,Nazeeruddin, Mohammad K.,Grä,tzel, Michael American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol. No.
<P>In solid-state dye-sensitized solar cells (ssDSCs), the poor pore filling of the mesoporous semiconductor and the short diffusion length of charge carriers in the hole-transport material (HTM) have limited the mesoscopic titania layer to a thickness of 2–3 μm. To increase the amount of light harvested by ssDSCs, organic dyes with high molar extinction coefficients are of great importance and have been the focus of intensive research. Here we investigate ssDSCs using an organic D−π–A dye, coded Y123, and 2,2′,7,7′-tetrakis(<I>N</I>,<I>N</I>-di-<I>p</I>-methoxyphenylamine)-9,9′-spirobifluorene as a hole-transport material, exhibiting 934 mV open-circuit potential and 6.9% efficiency at standard solar conditions (AM1.5G, 100 mW cm<SUP>–2</SUP>), which is a significant improvement compared to the analogue dyes C218, C220, and JK2 (<I>V</I><SUB>oc</SUB> values of 795, 781, and 914 mV, respectively). An upward shift in the conduction band edge was observed from photovoltage transient decay and impedance spectroscopy measurements for devices sensitized with Y123 and JK2 dyes compared to the device using C220 as sensitizer, in agreement with the high photovoltage response of the corresponding ssDSCs. This work highlights the importance of the interaction between the HTM and the dye-sensitized TiO<SUB>2</SUB> surface for the design of ssDSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-1/jp209691e/production/images/medium/jp-2011-09691e_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp209691e'>ACS Electronic Supporting Info</A></P>
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Burschka, Julian,Dualeh, Amalie,Kessler, Florian,Baranoff, Etienne,Cevey-Ha, Ngoc-Lê,Yi, Chenyi,Nazeeruddin, Mohammad K.,Grä,tzel, Michael American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.45
<P>Chemical doping is an important strategy to alter the charge-transport properties of both molecular and polymeric organic semiconductors that find widespread application in organic electronic devices. We report on the use of a new class of Co(III) complexes as p-type dopants for triarylamine-based hole conductors such as spiro-MeOTAD and their application in solid-state dye-sensitized solar cells (ssDSCs). We show that the proposed compounds fulfill the requirements for this application and that the discussed strategy is promising for tuning the conductivity of spiro-MeOTAD in ssDSCs, without having to rely on the commonly employed photo-doping. By using a recently developed high molar extinction coefficient organic D-π-A sensitizer and p-doped spiro-MeOTAD as hole conductor, we achieved a record power conversion efficiency of 7.2%, measured under standard solar conditions (AM1.5G, 100 mW cm<SUP>–2</SUP>). We expect these promising new dopants to find widespread applications in organic electronics in general and photovoltaics in particular.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-45/ja207367t/production/images/medium/ja-2011-07367t_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207367t'>ACS Electronic Supporting Info</A></P>
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