Efficient singlet exciton fission in pentacene prepared from a soluble precursor

被引:12
作者
Tabachnyk, Maxim [1 ]
Karani, Arfa H. [1 ]
Broch, Katharina [1 ,2 ]
Pazos-Outon, Luis M. [1 ]
Xiao, James [1 ]
Jellicoe, Tom C. [1 ]
Novak, Jiri [3 ,4 ]
Harkin, David [1 ]
Pearson, Andrew J. [1 ]
Rao, Akshay [1 ]
Greenham, Neil C. [1 ]
Bohm, Marcus L. [1 ]
Friend, Richard H. [1 ]
机构
[1] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 OHE, England
[2] Fritz Haber Inst Max Planck Gesell, Faradayweg 4-6, D-1495 Berlin, Germany
[3] Masaryk Univ, Cent European Inst Technol, Kotlarska 2, Brno 61137, Czech Republic
[4] Masaryk Univ, Dept Condensed Matter Phys, Kotlarska 2, Brno 61137, Czech Republic
来源
APL MATERIALS | 2016年 / 4卷 / 11期
基金
英国工程与自然科学研究理事会;
关键词
FIELD-EFFECT TRANSISTOR; THIN-FILM TRANSISTORS; HIGH-PERFORMANCE; DYNAMICS;
D O I
10.1063/1.4968518
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Carrier multiplication using singlet exciton fission ( SF) to generate a pair of spin-triplet excitons from a single optical excitation has been highlighted as a promising approach to boost the photocurrent in photovoltaics (PVs) thereby allowing PV operation beyond the Shockley-Queisser limit. The applicability of many efficient fission materials, however, is limited due to their poor solubility. For instance, while acene-based organics such as pentacene ( Pc) show high SF yields ( up to 200%), the plain acene backbone renders the organic molecule insoluble in common organic solvents. Previous approaches adding solubilizing side groups such as bis(tri-iso-propylsilylethynyl) to the Pc core resulted in low vertical carrier mobilities due to reduction of the transfer integrals via steric hindrance, which prevented high efficiencies in PVs. Here we show how to achieve good solubility while retaining the advantages of molecular Pc by using a soluble precursor route. The precursor fully converts into molecular Pc through thermal removal of the solubilizing side groups upon annealing above 150 degrees C in the solid state. The annealed precursor shows small differences in the crystallinity compared to evaporated thin films of Pc, indicating that the Pc adopts the bulk rather than surface polytype. Furthermore, we identify identical SF properties such as sub-100 fs fission time and equally long triplet lifetimes in both samples. (C) 2016 Author(s).
引用
收藏
页数:6
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