Effect of Crystallizable Solvent on Phase Separation and Charge Transport in Polymer-fullerene Films

2017 2nd International Conference on Advanced Materials Research and Manufacturing Technologies

材料科学;机械制造

Kaewprajak, A.^1,2 ; Lohawet, K.^1 ; Wutikhun, T.^1 ; Meemuk, B.^1 ; Kumnorkaew, P.^1 ; Sagawa, T.^2

National Nanotechnology Center, National Science and Technology Development Agency, 111 Thailand Science Park, Phahonyothin Rd., Khlongnueng, Khlongluang,Pathumthani

12120, Thailand^1

Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto

606-8501, Japan^2

关键词: 1 ,3 ,5-Trichlorobenzene;    Benzothiadiazoles;    Bulk heterojunction (BHJ);    Current voltage analysis;    Methyl esters;    Polymer-fullerene;    TEM observations;    Thienyl;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/229/1/012015/pdf
DOI  :  10.1088/1757-899X/229/1/012015

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The effect of 1,3,5-trichlorobenzene (TCB) as crystallizable solvent on poly[N-9′-heptadecanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) and [6,6]-phenyl C71butyric acid methyl ester (PC71BM) bulk heterojunction (BHJ) was investigated. We found that phase separation of PCDTBT and PC71BM and formation of the condensed network of polymers were appropriately regulated by addition of TCB in the BHJ films, which were confirmed by optical microscopic, AFM, and TEM observations in addition to current-voltage analyses. Through the formation of a good continuous pathway for carrier transport by the addition of TCB, 2.5 times enhancement of the hole mobility in the BHJ film was attained from 5.82 × 10-5cm2V-1s-1without TCB to 1.48 × 10-4cm2V-1s-1with 20 mg ml-1of TCB.