4:00 PM - 6:00 PM
[13p-P9-26] Preparation of lead halide perovskite/TiO2 composite film
and its application to thick perovskite films
Keywords:solar cell, titanium oxide
Perovskite solar cells, in which methyl ammonium lead iodide (CH3NH3PbI3) was used in the photoactive layer, can be fabricated by utilizing an organic-inorganic hybrid perovskite crystals by a solution process. Since the high energy conversion efficiency (PCE) of 20% have been reported, it has attracted the attention. Efficient characteristics of the perovskite solar cells are expected due to the favorable semiconductor properties of perovskite crystals. Highly efficient perovskite solar cell need a uniform and dense perovskite layer.
One of the roles of mesoporous titanium oxide layer in the perovskite solar cell is a scaffold for perovskite crystal formation. It is expected to assist the formation of high quality perovskite film. Methylammonium lead iodide perovskites easily crystalized as a single crystal in several mm size by an inverse temperature recrystallization method. However, the high crystallinity inhibit the formation of dense uniform perovskite film for perovskite solar cells. The crystal structure and lattice constant matching between mesoporous titanium oxide film and lead halide perovskite are important for the uniform perovskite layer formation. In this study, tour purpose is to reduce the mismatch of the crystal structure and lattice constant. Also, we are trying to produce a perovskite thick film.
In this study, the mesoporous titanium oxide films were prepared by using a low-temperature a titanium oxide paste for plastic dye- sensitized solar cells. The low temperature titanium oxide pastes could control the pore volume by changing the titania particle size in the paste. Because the paste consists of a titanium oxide nanoparticles and water / alcohol mixed dispersion, changing the particle size and the mixing ratio of added titanium oxide particles are easily. Especially, to make a large pore size in the mesoporous film, 250 nm size titania particles were added. After the mesoporous films were immersed into DMF solution or γ- butyrolactone solution of lead halide and ammonium halide, perovskite crystal formation was carried out in the mesoporous film to form titanium oxide / lead halide perovskite composite film. On the composite films, perovskite layer formation or a composite film formation were carried out in order to obtain a thicker uniform perovskite films.
One of the roles of mesoporous titanium oxide layer in the perovskite solar cell is a scaffold for perovskite crystal formation. It is expected to assist the formation of high quality perovskite film. Methylammonium lead iodide perovskites easily crystalized as a single crystal in several mm size by an inverse temperature recrystallization method. However, the high crystallinity inhibit the formation of dense uniform perovskite film for perovskite solar cells. The crystal structure and lattice constant matching between mesoporous titanium oxide film and lead halide perovskite are important for the uniform perovskite layer formation. In this study, tour purpose is to reduce the mismatch of the crystal structure and lattice constant. Also, we are trying to produce a perovskite thick film.
In this study, the mesoporous titanium oxide films were prepared by using a low-temperature a titanium oxide paste for plastic dye- sensitized solar cells. The low temperature titanium oxide pastes could control the pore volume by changing the titania particle size in the paste. Because the paste consists of a titanium oxide nanoparticles and water / alcohol mixed dispersion, changing the particle size and the mixing ratio of added titanium oxide particles are easily. Especially, to make a large pore size in the mesoporous film, 250 nm size titania particles were added. After the mesoporous films were immersed into DMF solution or γ- butyrolactone solution of lead halide and ammonium halide, perovskite crystal formation was carried out in the mesoporous film to form titanium oxide / lead halide perovskite composite film. On the composite films, perovskite layer formation or a composite film formation were carried out in order to obtain a thicker uniform perovskite films.