Dye-Sensitized Solar Cell Using a TiO₂ Nanocrystalline Film Electrode Modified by an Aluminum Phthalocyanine and Myristic Acid Coadsorption Layer

Abstract

A dye-sensitized solar cell using a nanocrystalline TiO2 film electrode modified by aluminum phthalocyanine, aluminum 2,9,16,23-tetraphenoxy-29H,31H-phthalocyanine hydroxide (AlTPPc), and a myristic acid adsorbed layer was developed. The UV-vis absorption spectrum of the TiO2 film electrode modified by an AlTPPc and myristic acid adsorbed layer shows that the aggregation of AlTPPc molecules was suppressed by myristic acid. For a cell using AlTPPc adsorbed on a nanocrystalline TiO 2 film electrode, ISC, VOC, and FF were 0.026 mA cm -2 , 186 mV, and 40.4%, respectively. The maximum power output was estimated to be 2.25 µW cm -2 . In contrast, ISC, VOC, and FF values were 0.061 mA cm -2 , 225 mV, and 40.0%, respectively, and the maximum power output was estimated to be 5.40 µW cm -2 using a TiO2 film electrode modified by an AlTPPc and myristic acid layer. The ISC and VOC values increased with the concentration ratio of myristic acid to AlTPPc until 0.1 and then decreased, and the IPCE value at 700 nm of the solar cell based on the nanocrystalline TiO 2 film electrode modified by an AlTPPc and myristic acid adsorbed layer is 1.7 times larger than that of the cell using AlTPPc adsorbed on a nanocrystalline TiO2 film electrode.

A Strategy To Increase the Efficiency of the Dye-Sensitized TiO2 Solar Cells Operated by Photoexcitation of Dye-to-TiO2 Charge-Transfer Bands

“…It has been well established that the coadsorption of DCA leads to an increase in η to a certain extent. 6b,7, 9 We also coadsorbed DCA onto Type-II-dye adsorbed TiO 2 films. As summarized in Table 3, V oc and J sc , and FF somewhat increased upon coadsorption of DCA except Cat-and Dop-sensitized DSSCs.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] A great number of dyes have been tested as sensitizers during the past 15 years in pursuit of high efficiency (η). Accordingly, the η has reached ∼11% in the laboratory scale.…”

Structure–Function Relationships in Unsymmetrical Zinc Phthalocyanines for Dye‐Sensitized Solar Cells

“…Phthalocyanines [1] are an active focus of intense research for the development of efficient light-to-energy conversion devices. [2][3][4][5][6][7][8][9][10][11][12][13] Such molecules have unique properties in terms of light absorption in the far visible region of the solar spectrum (l = 690 nm) with molecular extinction coefficients (e) higher than 100 000 dm 3 m À1 cm À1 and good chemical stability.…”

Synthesis of para‐Amino Benzoic Acid–TiO2 Hybrid Nanostructures of Controlled Functionality by an Aqueous One‐Step Process

“…In addition, the pH of the aqueous solution hardly affected the adsorption, whereas heat treatment (e.g., of TiO 2 Ͼ 500°C) noticeably lowered the adsorption. [12] In contrast, the synthesis of organic-inorganic hybrids from modified precursors by sol-gel processing usually led to amorphous as-prepared materials and required acidic conditions to favour the ligand exchange for reorganization to generate the crystallization of the inorganic part. Sanchez et al reported a one-step sol-gel method to obtain surface-protected nanocrystalline zirconium, titanium and tin dioxide particles in the presence of acetylacetone and para-toluenesulfonic acid.…”