A High Dielectric N-Type Small Molecular Acceptor Containing Oligoethyleneglycol Side-Chains for Organic Solar Cells

被引:23
作者
Jang, Bomee [1 ]
Lee, Changyeon [2 ]
Lee, Young Woong [1 ]
Kim, Donguk [2 ]
Uddin, Mohammad Afsar [1 ]
Kim, Felix Sunjoo [3 ]
Kim, Bumjoon J. [2 ]
Woo, Han Young [1 ]
机构
[1] Korea Univ, Dept Chem, Seoul 02841, South Korea
[2] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 34141, South Korea
[3] Chung Ang Univ, Sch Chem Engn & Mat Sci, Seoul 06974, South Korea
基金
新加坡国家研究基金会;
关键词
N-type small molecule; dielectric constant; morphology; organic solar cells; CONJUGATED POLYMERS; ELECTRON-ACCEPTOR; EFFICIENCY; PERFORMANCE; SEMICONDUCTORS; DESIGN; RECOMBINATION; AGGREGATION; ORIENTATION; MORPHOLOGY;
D O I
10.1002/cjoc.201700629
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report a new small molecular acceptor, ITIC-OEG, which is based on indacenodithieno[3,2-b]thiophene and 1,1-(dicyanomethylene)-3- indanone including oligoethyleneglycol (OEG) side-chains. ITIC-OEG was found to have higher dielectric constant (epsilon(r)=5.6) than that of a reference molecule of ITIC with normal alkyl substituents (epsilon(r)=3.9). The dielectric constant of medium influences significantly the exciton binding energy and the resulting charge separation and recombination. The optical, electrochemical and morphological properties of ITIC-OEG and its photovoltaic characteristics were investigated by blending with a semi-crystalline donor polymer, PPDT2FBT, with comparison to those of ITIC. ITIC-OEG shows more red-shifted absorption and stronger crystalline packing than ITIC. However, the lower photovoltaic performance (with 1.58% power conversion efficiency, PCE) was measured for PPDT2FBT:ITIC-OEG, compared to PPDT2FBT:ITIC (5.52% PCE). The incompatibility between PPDT2FBT and ITIC-OEG (due to high hydrophilic nature of OEG chains) resulted in poor intermixing with large domain separation over 300 nm, showing inefficient charge separation and significant charge recombination. Therefore, to investigate the effect of dielectric constant of the materials on the charge separation and recombination, the blend morphology of the PPDT2FBT:ITIC-OEG should be optimized first by improving their miscibility and phase separation.
引用
收藏
页码:199 / 205
页数:7
相关论文
共 55 条
[1]  
[Anonymous], APPL PHYS LETT
[2]  
[Anonymous], NAT COMMUN
[3]  
[Anonymous], SYNTH MET
[4]   Single-Junction Polymer Solar Cells Exceeding 10% Power Conversion Efficiency [J].
Chen, Jing-De ;
Cui, Chaohua ;
Li, Yan-Qing ;
Zhou, Lei ;
Ou, Qing-Dong ;
Li, Chi ;
Li, Yongfang ;
Tang, Jian-Xin .
ADVANCED MATERIALS, 2015, 27 (06) :1035-1041
[5]   Dielectric Effect on the Photovoltage Loss in Organic Photovoltaic Cells [J].
Chen, Song ;
Tsang, Sai-Wing ;
Lai, Tzung-Han ;
Reynolds, John R. ;
So, Franky .
ADVANCED MATERIALS, 2014, 26 (35) :6125-+
[6]  
Chen X., 2016, Angewandte Chemie, V128, P10532
[7]   Alloy Acceptor: Superior Alternative to PCBM toward Efficient and Stable Organic Solar Cells [J].
Cheng, Pei ;
Yan, Cenqi ;
Wu, Yang ;
Wang, Jiayu ;
Qin, Meng ;
An, Qiaoshi ;
Cao, Jiamin ;
Huo, Lijun ;
Zhang, Fujun ;
Ding, Liming ;
Sun, Yanming ;
Ma, Wei ;
Zhan, Xiaowei .
ADVANCED MATERIALS, 2016, 28 (36) :8021-8028
[8]   Molecular Lock: A Versatile Key to Enhance Efficiency and Stability of Organic Solar Cells [J].
Cheng, Pei ;
Yan, Cenqi ;
Lau, Tsz-Ki ;
Mai, Jiangquan ;
Lu, Xinhui ;
Zhan, Xiaowei .
ADVANCED MATERIALS, 2016, 28 (28) :5822-+
[9]   High-Dielectric Constant Side-Chain Polymers Show Reduced Non-Geminate Recombination in Heterojunction Solar Cells [J].
Cho, Namchul ;
Schlenker, Cody W. ;
Knesting, Kristina M. ;
Koelsch, Patrick ;
Yip, Hin-Lap ;
Ginger, David S. ;
Jen, Alex K. -Y. .
ADVANCED ENERGY MATERIALS, 2014, 4 (10)
[10]   Charge Photogeneration in Organic Solar Cells [J].
Clarke, Tracey M. ;
Durrant, James R. .
CHEMICAL REVIEWS, 2010, 110 (11) :6736-6767