화학공학소재연구정보센터
Thin Solid Films, Vol.573, 134-139, 2014
Simple solution-processed titanium oxide electron transport layer for efficient inverted polymer solar cells
Titanium oxide (TiOX) is an effective electron transport layer (ETL) in polymer solar cells (PSCs). We report efficient inverted PSCs with a simple solution-processed amorphous TiOX (s-TiOX) film as an ETL. The s-TiOX film with high light transmittance was prepared by spin-coating titanium(IV) isopropoxide isopropanol solution on indium tin oxide coated glass in inert and then placed in air under room temperature for 60 min. The introduction of s-TiOX ETL greatly improved the short circuit current density of the devices. PSCs based on poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester and poly(4,8-bis-alkyloxy-benzo[1,2-b: 4,5-b'] dithiophene-alt-alkylcarbonyl-thieno[3,4-b] thiophene):[6,6]-phenyl-C71-butyric acid methyl ester using s-TiOX film as ETL shows high power conversion efficiency of 4.29% and 6.7% under the illumination of AM 1.5G, 100 mW/cm(2), which shows enhancements compared to the conventional PSCs with poly(styrenesulfonate)doped poly(ethylenedioxythiophene) as anode buffer layer. In addition, the device exhibits good stability in a humid ambient atmosphere without capsulation. The results indicate that the annealing-free, simple solution processed s-TiOX film is an efficient ETL for high-performance PSCs. (C) 2014 Elsevier B.V. All rights reserved.