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Boix, Pablo P.,Lee, Yong Hui,Fabregat-Santiago, Francisco,Im, Sang Hyuk,Mora-Sero, Ivan,Bisquert, Juan,Seok, Sang Il American Chemical Society 2012 ACS NANO Vol.6 No.1
<P>Nanoporous metal oxide electrodes provide a high internal area for dye anchoring in dye-sensitized solar cells, but the thickness required to extinguish the solar photons also enhances recombination at the TiO<SUB>2</SUB>/electrolyte interface. The high extinction coefficient of inorganic semiconductor absorber should allow the reduction of the film thickness, improving the photovoltage. Here we study all-solid semiconductor sensitized solar cells, in the promising TiO<SUB>2</SUB>/Sb<SUB>2</SUB>S<SUB>3</SUB>/P3HT configuration. Flat and nanostructured cells have been prepared and analyzed, developing a cell performance model, based on impedance spectroscopy results, that allows us to determine the impact of the reduction of metal oxide film thickness on the operation of the solar cell. Decreasing the effective surface area toward the limit of flat samples produces a reduction in the recombination rate, increasing the open circuit potential, <I>V</I><SUB>oc</SUB>, while providing a significant photocurrent. However, charge compensation problems as a consequence of inefficient charge screening in flat cells increase the hole transport resistance, lowering severely the cell fill factor. The use of novel structures balancing recombination and hole transport will enhance solid sensitized cell performance.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-1/nn204382k/production/images/medium/nn-2011-04382k_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn204382k'>ACS Electronic Supporting Info</A></P>
MODULATING CH 3 NH 3 PbI 3 PEROVSKITE CRYSTALLIZATION BEHAVIOR THROUGH PRECURSOR CONCENTRATION
KUNWU FU,SUBODH MHAISALKAR,SWEE SIEN LIM,PABLO P. BOIX,NRIPAN MATHEWS,YANAN FANG,LYDIA H. WONG,TZE CHIEN SUM 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
Perovskite-based photovoltaic devices have recently achieved impressively high e±ciencies be-yond 15% and gained great interest. We show here the formation of perovskite cluster overlayerstructures which consist of individual perovskite grains on top of mesoporous TiO 2 ¯lms, coex-isting with the randomly distributed nanocrystals within the ¯lms. Perovskite solution concen-tration was found to play an important role in modulating the perovskite crystallization andcluster overlayer formation process. Absorbance increase in visible wavelength range and shift ofphotoluminescence (PL) responses of perovskite ¯lms due to the e®ect of precursor concentrationchange were observed and investigated in detail. The crystallographic analysis of theCH 3 NH 3 PbI 3 ¯lms shows a gradual decrease of the perovskite lattice parameters and shrinkage ofunit volume as precursor solution concentration increases, which is correlated to the changes ofoptical properties. Finally, perovskite-based solar cell device performance was enhanced at higherprecursor concentration.
Heo, Jin Hyuck,Im, Sang Hyuk,Kim, Hi-jung,Boix, Pablo P.,Lee, Suk Joong,Seok, Sang Il,Mora-Seró,, Ivá,n,Bisquert, Juan American Chemical Society 2012 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.116 No.39
<P>The Sb<SUB>2</SUB>S<SUB>3</SUB>-sensitized photoelectrochemical cells (Sb<SUB>2</SUB>S<SUB>3</SUB>–SPECs) in cobalt electrolyte were fabricated by depositing Sb<SUB>2</SUB>S<SUB>3</SUB> on the macroporous TiO<SUB>2</SUB> nanorods electrodes and consecutively spin-coating P3HT (Poly-3-hexylthiophene) interlayer to relieve the mass transport problem at vicinity of Sb<SUB>2</SUB>S<SUB>3</SUB> and cobalt redox couples and reduce the backward recombination. Through the introduction of P3HT interlayer, we could greatly enhance the power conversion efficiency of Sb<SUB>2</SUB>S<SUB>3</SUB>–SPEC to 4.2% at 1 sun illumination, whereas the Sb<SUB>2</SUB>S<SUB>3</SUB>–SPEC without P3HT interlayer exhibits 3.2% of device efficiency. The electrochemical impedance analysis let us know that the improved device performance was mainly attributed to the reduced backward recombination building up the higher open circuit voltage.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-39/jp305150s/production/images/medium/jp-2012-05150s_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp305150s'>ACS Electronic Supporting Info</A></P>
High efficiency electrospun TiO2nanofiber based hybrid organic-inorganic perovskite solar cell
Dharani, Sabba,Mulmudi, Hemant Kumar,Yantara, Natalia,Thu Trang, Pham Thi,Park, Nam Gyu,Graetzel, Michael,Mhaisalkar, Subodh,Mathews, Nripan,Boix, Pablo P. The Royal Society of Chemistry 2014 Nanoscale Vol.6 No.3
The good electrical and morphological characteristics of TiO2 nanofibers and the high extinction coefficient of CH3NH3PbI3 perovskite are combined to obtain a solar cell with a power conversion efficiency of 9.8%. The increase of the film thickness dramatically diminishes the performance due to the reduction in porosity of the TiO2 nanofiber framework. The optimum device (similar to 413 nm film thickness) is compared to a planar device, where the latter produces higher V-oc but lower J(sc), and consequently lower efficiency at all measured light intensities.