Photocoloration efficiency and stability of photoelectrochromic devices

Abstract In this study, a novel performance indicator termed “photocoloration efficiency (PhCE)” has been used to characterize photoelectrochromic devices with different architectures, developed by our research group and by others. It was found that PhCE is a suitable index for photoelectrochromics that gives emphasis on coloration kinetics. With use of PhCE, the parameters affecting device performance were identified: for efficient operation, the dye-sensitized solar cell of the device must produce an open circuit voltage of at least 450 mV at 1000 W/m2 of illumination. For devices with solar cells above this threshold, it is the thickness of the electrochromic film that dictates the ultimate performance: at exposure energy densities up to 0.6 W min cm− 2 different devices have different responses. At larger exposures however, PhCE values converge, and become proportional to the electrochromic film thickness. As for the device color, it can be tailored by alteration of the electrolyte thickness. The stability of a “partly covered” photoelectrochromic device has been tested experimentally. It was found that the device degraded after 70 days of testing, due to desorption of the N3 dye from TiO2 into the electrolyte.

[1]  C. Varotsos,et al.  Electrical properties of non-irradiated and X-irradiated LiH and LiD , 1986 .

[2]  Kuo-Chuan Ho,et al.  A photoelectrochromic device based on gel electrolyte with a fast switching rate , 2012 .

[3]  P. Yianoulis,et al.  Effects of paste storage on the properties of nanostructured thin films for the development of dye-sensitized solar cells , 2009 .

[4]  Michael Grätzel,et al.  Conversion of sunlight to electric power by nanocrystalline dye-sensitized solar cells , 2004 .

[5]  Satyen K. Deb,et al.  Opportunities and challenges in science and technology of WO3 for electrochromic and related applications , 2008 .

[6]  Marina E. Rincón,et al.  Photoelectrochromic performance of tungsten oxide based devices with PEG–titanium complex as solvent-free electrolytes , 2012 .

[7]  U. Krašovec,et al.  Photoelectrochromic window with Pt catalyst , 2006 .

[8]  Young-Sam Jung,et al.  Relation of Ru(II) dye desorption from TiO2 film during illumination with photocurrent decrease of dye-sensitized solar cells , 2010 .

[9]  Bing Tan,et al.  Dye-sensitized solar cells based on anatase TiO2 nanoparticle/nanowire composites. , 2006, The journal of physical chemistry. B.

[10]  Brian A. Gregg,et al.  Photoelectrochromic cells and their applications , 1997 .

[11]  Gimtong Teowee,et al.  User controllable photochromic (UCPC) devices , 1999 .

[12]  Wolfgang Graf,et al.  Switchable windows with tungsten oxide , 2008 .

[13]  B. Orel,et al.  New photoelectrochromic device , 2001 .

[14]  Xiao Wei Sun,et al.  A fast-switching light-writable and electric-erasable negative photoelectrochromic cell based on Prussian blue films , 2012 .

[15]  Kuo-Chuan Ho,et al.  A novel photoelectrochromic device with dual application based on poly(3,4-alkylenedioxythiophene) thin film and an organic dye , 2008 .

[16]  Philip C. Eames,et al.  Development of electrochromic evacuated advanced glazing , 2006 .

[17]  Volker Wittwer,et al.  Performance of a solid-state photoelectrochromic device , 2004 .

[18]  Marco-A. De Paoli,et al.  Performance and stability of TiO2/dye solar cells assembled with flexible electrodes and a polymer electrolyte , 2003 .

[19]  Andreas Georg,et al.  Electrochromic device with a redox electrolyte , 2009 .

[20]  Marko Topič,et al.  Preparation and Characterisation of Nano-Structured WO3-TiO2 Layers for Photoelectrochromic Devices , 2005 .

[21]  Clemens Bechinger,et al.  Photoelectrochromic windows and displays , 1996, Nature.

[22]  Kuo-Chuan Ho,et al.  Photovoltaic electrochromic device for solar cell module and self-powered smart glass applications , 2012 .

[23]  B. Orel,et al.  Comparison of Photoelectrochromic Devices with Different Layer Configurations , 2002 .

[24]  A. Meyer,et al.  The photovoltaic stability of, bis(isothiocyanato)rlutheniurn(II)‐bis‐2, 2′bipyridine‐4, 4′‐dicarboxylic acid and related sensitizers , 1997 .

[25]  H. Tributsch,et al.  Mechanisms of Instability in Ru-Based Dye Sensitization Solar Cells , 1997 .

[26]  P. Yianoulis,et al.  Development of photoelectrochromic devices for dynamic solar control in buildings , 2010 .

[27]  Mohammad Khaja Nazeeruddin,et al.  Conversion of light to electricity by cis-X2bis(2,2'-bipyridyl-4,4'-dicarboxylate)ruthenium(II) charge-transfer sensitizers (X = Cl-, Br-, I-, CN-, and SCN-) on nanocrystalline titanium dioxide electrodes , 1993 .

[28]  Hui Huang,et al.  Photoelectrochromic properties of NiO film deposited on an N-doped TiO2 photocatalytical layer , 2009 .

[29]  Francois Pichot,et al.  Flexible Solid‐State Photoelectrochromic Windows , 1999 .

[30]  Sung Jong Yoo,et al.  Tandem dye-sensitized solar cell-powered electrochromic devices for the photovoltaic-powered smart window , 2007 .

[31]  Giuseppe Chidichimo,et al.  Fast, self-supplied, all-solid photoelectrochromic film , 2010 .

[32]  M. Hepel,et al.  Bicomponent WO 3 / TiO2 Films as Photoelectrodes , 1999 .

[33]  M. Grätzel.  Dye-sensitized solar cells , 2003 .

[34]  Wei-Ting Wu,et al.  Fast-switching photovoltachromic cells with tunable transmittance. , 2009, ACS nano.

[35]  P. Liska,et al.  Fabrication of thin film dye sensitized solar cells with solar to electric power conversion efficiency over 10 , 2008 .

[36]  P. Yianoulis,et al.  “Partly covered” photoelectrochromic devices with enhanced coloration speed and efficiency , 2012 .

[37]  P. Varotsos.  The dielectric loss of X-irradiated LiD + Mg+2 , 1980 .