Photovoltaic properties of phthalocyanine based p–n diode evaporated onto titanium dioxide
| Autor: | Yuji Ohmori, Keiichi Miyairi, Eiji Itoh |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Open-circuit voltage Inorganic chemistry Metals and Alloys Analytical chemistry Surfaces and Interfaces Photovoltaic effect Substrate (electronics) Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Buckminsterfullerene chemistry Titanium dioxide Materials Chemistry Phthalocyanine HOMO/LUMO Short circuit |
| Zdroj: | Thin Solid Films. 499:369-373 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2005.07.027 |
| Popis: | We have investigated the photovoltaic properties of organic p-n heterojunction photovoltaic cells consisting of p-type zinc (or copper) phthalocyanine (ZnPc, CuPc) and various dye materials, such as tetrapyridyl porphyrin (H 2 TPyP), DCM, Coumarin6, perylene derivative (BP-PTCDI), and Buckminsterfullerene (C 60 ), evaporated on an n-type anatase TiO 2 film. The open circuit voltage (V oc ) of ITO/TiO 2 /dye/ ZnPc/Au devices lined up in order of DCM > BP-PTCDI >H 2 TPyP>C 60 which corresponds to the order of the energy difference between the Lowest Unoccupied Molecular Orbital (LUMO) values of dye material and the ionization potential of ZnPc. The quantum efficiency also increased effectively by inserting the very thin dye layer (∼ 10 nm) between phthalocyanine (Pc) and TiO 2 layer compared to TiO 2 /Pc double layered device, except Coumarin6, whose LUMO locates higher than Pc, corresponding to the concept of donor-acceptor system. The largest short circuit current density (J sc ) was obtained for the ITO/TiO 2 /C 60 /CuPc/Au multilayered structure. Higher values of V oc and J sc of 0.49 V and 5.42 mA/cm 2 , under 130 mW/cm 2 white light illumination, were obtained by substituting coevaporated layer of C 60 and CuPc by C 60 layer and by heating the substrate at 120 °C during the deposition. |
| Databáze: | OpenAIRE |
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