Acceptor-Substituted S,N-Heteropentacenes of Different Conjugation Length: Structure-Property Relationships and Solar Cell Performance
Acceptor-Substituted S,N-Heteropentacenes of Different Conjugation Length: Structure-Property Relationships and Solar Cell Performance
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DOI：
10.1002/adfm.201500565
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发表时间：
2015-06-10
影响因子：
19
通讯作者：
Baeuerle, Peter
中科院分区：
文献类型：
--
作者：
Kast, Hannelore;Mishra, Amaresh;Baeuerle, Peter
报道了新型受体-供体-受体（A-D-A）基共轭功能分子1-3的合成、光电和光伏性质，其中包含平面S，N-杂并五苯作为中心供体，被各种末端受体单元取代，例如1，1-二氰基亚乙烯基（DCV）和1-（1，1-二氰基亚甲基）-环己-2-烯（DCC）。端基的结构变化为分子1-3提供了逐渐增加的共轭，这是由于来自DCC单元的双键数量增加。从光电性能的研究中，推导出了结构与性能的关系，并将新型A-D-A杂并五苯化合物1-3作为光活性给体组分，与[6，6]-苯基-C-61-丁酸甲酯作为受体一起应用于溶液处理的体异质结太阳能电池中。S，N-杂并五苯的结构变化导致光伏性能的明显趋势，并且实现了高达4.9%的功率转换效率。此外，由于双键的延伸，观察到开路电压（V-OC）和短路电流密度（J（SC））值之间的明显权衡。研究了添加剂对纳米级形貌和器件性能的优化作用。本文中呈现的发现表明，取决于材料的类型，添加剂可能对活性层形态和器件性能具有显著不同的影响。
The synthesis, optoelectronic, and photovoltaic properties of novel acceptor-donor-acceptor (A-D-A) based -conjugated functional molecules 1-3, comprising a planar S,N-heteropentacene as central donor substituted with various terminal acceptor units, such as 1,1-dicyanovinylene (DCV) and 1-(1,1-dicyanomethylene)-cyclohex-2-ene (DCC), are reported. The structural variation of the end groups provides molecules 1-3 with gradually increased -conjugation due to a rising number of double bonds, which comes from the DCC unit(s). From optoelectronic investigation, structure-property relationships are deduced and the novel A-D-A heteropentacenes 1-3 are implemented as photoactive donor component in solution-processed bulk heterojunction solar cells together with [6,6]-phenyl-C-61-butyric acid methyl ester as acceptor. The structural variation in the S,N-heteropentacenes leads to clear trends in the photovoltaic performance and power conversion efficiencies of up to 4.9% are achieved. Furthermore, due to extension of the double bonds a clear trade-off between the open circuit voltage (V-OC) and the short circuit current density (J(SC)) values is observed. The role of additives on the optimization of the nanoscale morphology and device performance is investigated. The findings presented herein demonstrate that depending on the types of materials the additive may have significantly different effects on the active layer morphology and the device performance.