Photocapacitance of nanocrystalline oxide semiconductor films: Band-edge movement in mesoporous TiO2 electrodes during UV illumination

被引：95

作者：

Hagfeldt, A ^{[1
]}

Bjorksten, U ^{[1
]}

Gratzel, M ^{[1
]}

机构：

[1] ECOLE POLYTECH FED LAUSANNE,INST CHIM PHYS,CH-1015 LAUSANNE,SWITZERLAND

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1996年 / 100卷 / 20期

关键词：

D O I：

10.1021/jp9518567

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Impedance measurements of mesoporous TiO2 electrodes in contact with aqueous and nonaqueous electrolytes have been performed in the dark and under UV illumination. In the dark the differential capacitance was found to be dominated by the back contact. Bandgap excitation of the TiO2 film turned on a capacitance associated with the mesoporous semiconductor layer. This is interpreted in terms of trapping of photogenerated holes in surface states leading to unpinning of the energy bands. The unpinning of the energy bands during UV illumination was confirmed by a dye-sensitization experiment.

引用

页码：8045 / 8048

页数：4

共 24 条

[11]

HUANG SY, 1995, J ACT PASS ELECTRONI, V18, P23

[12] PREPARATION OF TIO2 (ANATASE) FILMS ON ELECTRODES BY ANODIC OXIDATIVE HYDROLYSIS OF TICL3 [J].

KAVAN, L ;

OREGAN, B ;

KAY, A ;

GRATZEL, M .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1993, 346 (1-2) :291-307

[13] ARTIFICIAL PHOTOSYNTHESIS .2. INVESTIGATIONS ON THE MECHANISM OF PHOTOSENSITIZATION OF NANOCRYSTALLINE TIO2 SOLAR-CELLS BY CHLOROPHYLL DERIVATIVES [J].

KAY, A ;

HUMPHRYBAKER, R ;

GRATZEL, M .

JOURNAL OF PHYSICAL CHEMISTRY, 1994, 98 (03) :952-959

[14] THE INFLUENCE OF SURFACE RECOMBINATION AND TRAPPING ON THE CATHODIC PHOTOCURRENT AT P-TYPE III-V-ELECTRODES [J].

KELLY, JJ ;

MEMMING, R .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1982, 129 (04) :730-738

[15]

KNOEDLER R, 1993, ENERGY MAT SOL CELLS, V30, P277

[16]

KONENKAMP R, 1993, J PHYS CHEM-US, V97, P7328, DOI 10.1021/j100130a034

[17] RECOMBINATION IN NANOPHASE TIO2 FILMS [J].

KONENKAMP, R ;

HENNINGER, R .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 1994, 58 (01) :87-90

[18] HETERODYADS - ELECTRON-TRANSFER AT A SEMICONDUCTOR ELECTRODE LIQUID ELECTROLYTE INTERFACE MODIFIED BY AN ADSORBED SPACER ACCEPTOR COMPLEX [J].

MARGUERETTAZ, X ;

ONEILL, R ;

FITZMAURICE, D .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1994, 116 (06) :2629-2630

[19]

MEMMING R, 1980, PHOTOCHEMICAL CONVER, P243

[20] 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 TIO2 ELECTRODES [J].

NAZEERUDDIN, MK ;

KAY, A ;

RODICIO, I ;

HUMPHRYBAKER, R ;

MULLER, E ;

LISKA, P ;

VLACHOPOULOS, N ;

GRATZEL, M .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1993, 115 (14) :6382-6390

← 1 2 3 →