About AIST > Organization > Research Center for Photovoltaics > Research Teams & Themes > Functinal Thin Films Team

Research Center for Photovoltaics


Functional Thin Films Team ( FTFT )



We are focusing on organic-based solar cells toward their applications by addressing issues that are still unresolved such as the power conversion efficiency, the durability and the low-cost processing techniques. Organic-based thin-film solar cells offer exceptional advantages such as resource conservation.



To realize the practical use of organic-based solar cells, it is necessary to further improve the efficiency and the lifetime. For high efficiency organic thin-film solar cells, we perform structure analysis and optimization of the bulk heterojunction. Furthermore, we are developing see-through flexible cells and sub-modules by printing process and their application to energy harvesting in cooperation with universities and private companies. Regarding the new field of organic-inorganic hybrid perovskite solar cells, in particular, we are focusing on new fabrication techniques and engineering the interfacial processes to achieve high efficiency and durability.


Research Activities

Figure. 1 Crystal structure of perovskite layer.

(1)Organic-inorganic hybrid perovskite solar sells

We develop perovskite-based materials and their thin-film fabrication using solution coating and vacuum deposition processes for low-cost and high-power conversion efficiency. In particular, we develop a novel vacuum deposition process for precise composition control of the perovskite layer. Furthermore, we focus on interfaces of perovskite/hole transporting layer and perovskite/metal oxide layer for high efficiency and durability.

(2)Organic thin-film solar cells

We investigate the structure of bulk heterojunction and develop novel metal-oxide and organic buffer layers for the high efficient solar cells. We also develop standard cells for in-door use. Under low illuminance, organic-based solar cells are expected to show high efficiency compared to amorphous Si solar cells. We examine the organic thin-film solar cell properties by the LED light irradiation and optimize their cell structure.



Figure. 1 Crystal structure of perovskite layer.


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Figure. 2 Cross section SEM image of perovskite solar cell fabricated by solution coating technique.

  Figure. 3 Schematic device structure of a perovskite solar cell.


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Figure. 4  A see-through organic thin-film solar cell module.

Figure. 5 A module of organic thin-film solar cell fabricated by flexographic printing.



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