Photovoltaic Properties of Organic p–n Junction Devices Consisting of Phthalocyanine and n-Type Porphyrin Deposited on an n-Type TiO₂Layer

On photovoltaic effect in hybrid heterojunction formed from palladium phthalocyanine and titanium dioxide layers

“…It is worth adding at this point that the investigated system has not been optimized with regard to the photovoltaic parameters. However, the photovoltaic effect parameters for our system take values comparable with the values obtained on other bilayer systems with homogeneous TiO 2 [3,8,13].…”

“…Hybrid devices formed from titanium dioxide (TiO 2 ) and polymers [1][2][3][4][5] or low molecular weight organic compounds [6][7][8][9][10][11][12][13][14][15][16] exhibit interesting photovoltaic properties. In these devices, TiO 2 constitutes an n-type semiconductor with a high light transmission and good chemical and thermal stability, whereas the organic material should exhibit the ability to transport of holes and strong light absorption.…”

“…The desired optical and electrical properties are attributes of some conjugated polymers [1,2,15], porphyrins and phthalocyanines [16][17][18]. In particular, zinc phthalocyanine (ZnPc) [11,14], copper phthalocyanine (CuPc) [8,12] and bromophosphorus phthalocyanine (PBrPc) [13] films have been often used in TiO 2 /organic solid-state heterostructures. In all the systems mentioned here, the charge carrier photogeneration process results basically from a dissociation of the excited state of the organic material at the TiO 2 /organic interface which leads to the electron transfer to the TiO 2 conduction band and a positive charge is transported through the organic material.…”

Photovoltaic properties of a sandwich cell consisting of bromophosphorus phthalocyanine and titanium dioxide layers

“…The latter, namely dye-sensitised nanocrystalline TiO 2 , is often used in photoelectrochemical and solid state solar cells [2]. There have also been several studies dealing with the photovoltaic properties of p-n heterojunctions in which the TiO 2 layer plays the role of n-type semiconductor and the p-type semiconductor is an organic material such as merocyanine [3], copper phthalocyanine CuPc [4,5], zinc phthalocyanine ZnPc [5,6], polythiophene [7], poly(phenylene-vinylene): MEH-PPV [8][9][10][11], PA-PPV [12], MDMO-PPV [13], or porphyrins [5,14,15]. The main focus of these works is the investigation of photovoltaic structures that will link the beneficial properties of organic materials (high optical absorption) with those of inorganic ones (well properties of electronic transport).…”

“…Additional research performed by us on the ITO/PBrPc/Al system indicates, that PBrPc, like other typical metallophthalocyanines, may be treated as a p-type material. This implies that the system of TiO 2 /PBrPc layers existing in our structure forms a n-p heterojunction, because the TiO 2 layer exhibits n-type conductivity [5,17] additional Tc layer is included in this system in order to: (i) prevent the PBrPc layer from being damaged during Au deposition and (ii) eliminate dissociation of excitons excited in PBrPc on a metal electrode. A similar role is played by bathocuproine in other photovoltaic structures [18].…”