세미나안내

[2015 03 02] 특별세미나 (BK21PLUS)

Air-Exposure Effects on Spiro-MeOTAD Films and Implications for Perovskite Solar Cell Stability

MSE Graduate Students and Researchers

관리자 | 2015.02.26 16:19 | 조회 3719


Reception: MSE Graduate Students and Researchers

Reference: MSE Professors

Subject:  MSE/BK21PLUS Special Seminar_Prof. Yabing Qi

 

Date: 2015. 03. 02 (MON), 11:00 ~ 12:15

Place: LG Cooperative Electronics Engineering Building, Auditorium #101

Title: Air-Exposure Effects on Spiro-MeOTAD Films and Implications for Perovskite Solar Cell Stability

Speaker: Prof. Yabing Qi (Okinawa Institute of Science and Technology Graduate University, OIST)

Host of a Seminar: Prof. Tae-Woo Lee

 

Abstract:

Recently perovskite-based solar cells have garnered much attention because of low-cost fabrication and high efficiency (~20%). On the other hand, the understanding about device degradation mechanisms and long-term stability remains largely elusive. In this talk, I will focus on air-exposure effects on 2,2,7,7-tetrakis(N,N-di-p-methoxy phenylamine)-9,9-spirobifluorene (spiro-MeOTAD) films, the most widely used hole transport material for perovskite solar cells. In the case of neat spiro-MeOTAD films prepared by vacuum evaporation, gas molecules diffuse into spiro-MeOTAD films causing a decrease in charge mobility [1]. In the case of Li-bis(trifluoromethanesulfonyl)-imide (LiTFSI) doped spiro-MeOTAD films prepared by spin coating, 3 hours air-exposure results in the migration of LiTFSI from the bottom to the top across the spiro-MeOTAD film. A combined microscopy study by AFM, cross sectional Scanning Electron Microscopy, optical microscopy and Fourier Transform Infrared microscopy reveals the presence of a relatively high density of pinholes that form channels across the doped spiro-MeOTAD film. These pinholes may play a major role in the migration processes of the LiTFSI within the spiro-MeOTAD films as well as on the degradation processes of solar cells. This is further confirmed by the rapid decreasing efficiency of perovskite solar cells with solution prepared doped spiro-MeOTAD layers when exposed to air [2].

 

[1]        Luis K. Ono, Philip Schulz, James J. Endres, Gueorgui O. Nikiforov, Yuichi Kato, Antoine Kahn, and Yabing Qi*, air-Exposure-Induced Gas-Molecule Incorporation into spiro-MeOTAD Films. J. Phys. Chem. Lett. 5, 1374-1379 (2014)

 

[2]        Zafer Hawash, Luis K. Ono, Sonia R. Raga, Michael V. Lee, Yabing Qi*, Air-Exposure Induced Dopant Re-distribution and Energy Level Shifts in Spin Coated spiro-MeOTAD films, Chem. Mater., in press (2014) (DOI: 10.1021/cm504022q)

 


 
Department of Materials Science and Engineering / MSE BK21+



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