Distinguishing the Importance of Fullerene Phase Separation from Polymer Ordering in the Performance of Low Band Gap Polymer:Bis-Fullerene Heterojunctions

被引:18
作者
Chen, Huipeng [1 ]
Hsiao, Yu-Che [2 ]
Chen, Jihua [3 ]
Hu, Bin [2 ]
Dadmun, Mark [1 ,4 ]
机构
[1] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA
[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
[4] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA
基金
美国国家科学基金会;
关键词
SOLAR-CELLS; PHOTOVOLTAIC CELLS; ORGANIC PHOTOVOLTAICS; THIN-FILMS; MORPHOLOGY; EFFICIENCY; PCBM; POLY(3-HEXYLTHIOPHENE); MISCIBILITY; BISADDUCT;
D O I
10.1002/adfm.201401419
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
One way to improve power conversion efficiency (PCE) of polymer based bulk-heterojunction (BHJ) photovoltaic cells is to increase the open circuit voltage (V-oc). Replacing PCBM with bis-adduct fullerenes significantly improves V-oc and the PCE in devices based on the conjugated polymer poly(3-hexyl thiophene) (P3HT). However, for the most promising low band-gap polymer (LBP) system, replacing PCBM with ICBA results in poor short-circuit current (J(sc)) and PCE although V-oc is significantly improved. The optimization of the morphology of as-cast LBP/bis-fullerene BHJ photovoltaics is attempted by adding a co-solvent to the polymer/fullerene solution prior to film deposition. Varying the solubility of polymer and fullerene in the co-solvent, bulk heterojunctions are fabricated with no change of polymer ordering, but with changes in fullerene phase separation. The morphologies of the as-cast samples are characterized by small angle neutron scattering and neutron reflectometry. A homogenous dispersion of ICBA in LBP is found in the samples where the co-solvent is selective to the polymer, giving poor device performance. Aggregates of ICBA are formed in samples where the co-solvent is selective to ICBA. The resultant morphology improves PCE by up to 246%. A quantitative analysis of the neutron data shows that the interfacial area between ICBA aggregates and its surrounding matrix is improved, facilitating charge transport and improving the PCE.
引用
收藏
页码:7284 / 7290
页数:7
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