[20p-PB4-1~57] 12.5 Organic solar cells

[20p-PB4-26] Sheet Resistance characterizeation of transparent conductive substrate with compact layer composed of fine particles of highly crystalline TiO₂ on low-temperature fabrication for perovskite solar cells

〇Masaki Osone¹, Masashi Ikegami¹, Tsutomu Miyasaka¹ (1.Toin Univ of Yokohama)

Keywords:Perovskite solar cell, Low temperature coating

Perovskite solar cells are well-known as highly efficient solar cells exceeding 20% energy conversion efficiency, and as highly sensitive photo sensors in a certain cell configuration. For highly sensitive photo sensor applications, the requisite characteristics depend on the electrochemical properties of the compact layer. In other words, the density of the compact layer may affect the photo sensitivity.In order to produce a large-area module of perovskite solar cells, the compact layer coating method is very important. In this study, we prepare several kinds of coating paste using fine TiO2 nanoparticle powder with different particle sizes. The density, in another words, the compactness, of the compact layer coated transparent conductive oxide is investigated using electrochemical impedance or cyclic voltammetry. When the density is high, the impedance will be high, and the redox reaction on the surface will occur only reluctantly. On the other hand, when the density is low, the impedance will be low, and the redox reaction on the surface will occur easily. In this study, we discuss the relationship between the electrochemical characteristics, the sheet resistance of the substrate and the perovskite solar cell efficiencies.