Title: Recent progress in inorganic-organic hybrid perovskite solar cells 

Speaker: Prof. Sang Il Seok(Ulsan National Institute of Science and Technology (UNIST), Korea Research Institute of Chemical Technology (KRICT), Korea）  

Time: June 15, 2016 16:00PM 

Venue: No.101 meeting room of the library, IOS, CAS 

Abstract: Solar cells have gained tremendous attentions during past decades. Although, silicon-based solar cells are still dominant on the market, cheaper photovoltaic devices are necessary to support large-scale energy demands from solar energy. Inorganic-organic hybrid AMX3 (e. g. MAPbI3, FAPbI3) perovskite materials have attracted significant attention as light absorbers for the fabrication of low-cost and high-efficiency solar cells. In the work, a new photovoltaic architecture for efficient perovskite solar cells (PSCs) was proposed. A pillared architecture of a three-dimensional nanocomposite of perovskites fully infiltrating mesoporous TiO2 was evolved to the formation of continuous phases and perovskite domains overlaid with a polymeric hole conductor. Since then, the PCE of our PSCs has been rapidly improved, which can be attributed to the effective integration of the advantageous attributes of the refined bi-continuous architecture, deposition process, and composition of perovskite materials. Tailoring of perovskite absorber, electron and hole collecting layer enabled the extremely uniform, dense perovskite layers and led to improve the performance of the cells with a certified power conversion efficiency (PCE) exceeding 22 % under air-mass 1.5 global (AM 1.5G) illumination of 100 mW cm–2 intensities. Finally, the fabrication of efficient formamidinium tin iodide (FASnI3) perovskite solar cells will be mentioned.

References:

[1] N. J. Jeon and S. I. Seok*.Nat. Mater. 13, 897(2014).

[2] N. J. Jeon and S. I.Seok*. Nature 517, 476 (2015).

[3] W. S. Yang and I. S. Seok*. Science 348, 1234 (2015).

Biography：Dr. Sang Il Seok is currently a Distinguished Professor at the School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Korea. He also holds a dual appointment as an adjunct professor at the Korea Research Institute of Chemical Technology (KRICT), Korea. He obtained his PhD degree in the department of inorganic materials engineering of Seoul National University, Korea in 1995. He was a post-doctoral researcher at Cornell University, USA, where he investigated defects and transport in the Fe–Ti–O spinel structure. Since 2006, his research has focused on the integration of mesoporous architecture/semiconductor nanocrystals (including quantum dots and organometal halide perovskite materials)/organic hole conductors for high-performance inorganic–organic hybrid photovoltaics such as photodetectors and solar cells and novel materials for these applications.