Study On Organic Small Molecular Solar Cells And Organic Inorganic Hybrid Solar Cells

In recent years, solar cells have attracted extensive attention because they are as one of the most important ways to use solar energy. The research of solar cells has achieved great development for everyone unremitting efforts. In this paper, we mainly focus on the research of organic small molecules solar cells and hybrid solar cells.1. The research of organic small molecules solar cellsThe solar cells were fabricated using (Pdaa)₂Ir(acac) as the hole transport material and C₆₀ as the electron transport material. By changing the buffer layer, the thickness of functional layer and the doping materials we fabricated the solar cells of different structure. The best overall photovoltaic performance undergoing a series of device optimization was achieved with the device of ITO/(Pdaa)₂Ir(acac)(6 nm)/C₆₀(68 nm)/BCP(7 nm)/Al(80 nm) .The efficiency was 0.85%.2. The research of the hybrid solar cellsSolar cells based on nanoporous TiO₂ films and CuPc and C₆₀ were fabricated. The best overall photovoltaic performance undergoing a series of device optimization was achieved with the device of ITO/dense TiO₂ (30 nm)/nanoporous TiO₂ (130 nm)/C₆₀:CuPc (1:6 weight) (20 nm) /CuPc (20 nm)/PEDOT:PSS (50 nm)/Au (30 nm). The nanoporous TiO₂ can enormously increase the dissociation areas between CuPc and TiO₂, and the well-ordered structure of TiO₂ can act as an efficient transport channel. The device using the nanoporous TiO₂ films has better photovoltaic properties comparing to those using dense TiO₂ films. Higher photovoltaic performances were obtained by introducing a coevaporated layer of C₆₀:CuPc between TiO₂ and CuPc. The stability of inverted structure was better than the normal device, which gives a promising way for fabrication of solar cells with improved stability.