Structural Origins for Tunable Open-Circuit Voltage in Ternary-Blend Organic Solar Cells

被引:118
作者
Khlyabich, Petr P. [1 ]
Rudenko, Andrey E. [2 ,3 ]
Thompson, Barry C. [2 ,3 ]
Loo, Yueh-Lin [1 ]
机构
[1] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08544 USA
[2] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA
[3] Univ So Calif, Loker Hydrocarbon Res Inst, Los Angeles, CA 90089 USA
基金
美国国家科学基金会;
关键词
GIXD; solar cells; surface energy; ternary-blend active layers; tunable V-oc; BULK-HETEROJUNCTION PHOTOVOLTAICS; 2-ACCEPTOR COPOLYMERS; IR SENSITIZATION; POLYMER; PERFORMANCE; MORPHOLOGY; EFFICIENCY; OPTIMIZATION; DEVICES; ANALOGS;
D O I
10.1002/adfm.201502287
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ternary-blend bulk-heterojunction solar cells have provided a unique opportunity for tuning the open-circuit voltage (V-oc) as the effective highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO) energy levels shift with active-layer composition. Grazing-incidence X-ray diffraction (GIXD) measurements performed on such ternary-blend thin films reveal evidence that the two polymer donors interact intimately; their ionization potentials are thus reflections of the blend compositions. In ternary-blend thin films in which the two polymer donors do not interact physically, the polymer donors each retain their molecular electronic character; solar cells constructed with these ternary blends thus exhibit V(oc)s that are pinned to the energy level difference between the highest of the two lying HOMO and the LUMO of the electron acceptor. These observations are consistent with the organic alloy model proposed earlier. Quantification of the square of the square-root differences of the surface energies of the components provides a proxy for the Flory-Huggins interaction parameter for polymer donor pairs in these ternary-blend systems. Of the three ternary-blend systems examined herein, this quantity has to be below 0.094 in order for ternary-blend solar cells to exhibit tunable V-oc.
引用
收藏
页码:5557 / 5563
页数:7
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