Inducting effects of ionic liquid crystal modified-PEDOT:PSS on the performance of bulk heterojunction polymer solar cells
Inducting effects of ionic liquid crystal modified-PEDOT:PSS on the performance of bulk heterojunction polymer solar cells
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DOI：
10.1039/c5ra07362f
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发表时间：
2015-06
期刊：
影响因子：
3.9
通讯作者：
Xiaofeng Wang;Siwei Hu;Qiujuan Li;Fan Li;Kao Yao;Meiying Shi
中科院分区：
文献类型：
--
作者：
Xiaofeng Wang;Siwei Hu;Qiujuan Li;Fan Li;Kao Yao;Meiying Shi
合成了一种新型的离子液晶4′-（N，N，N-三甲基溴化铵己氧基）-4-氰基联苯（6CNBP-N），并将其作为一种新型添加剂用于P3 HT：PCBM聚合物太阳能电池（PSCs）中PEDOT：PSS阳极缓冲层的改性。由于6CNBP-N的离子功能，PEDOT：PSS的顶表面上的PEDOT的量随着6CNBP-N的量的增加而增加，导致更粗糙的表面和更好的导电性。最引人注目的是，当6CNBP-N改性的PEDOT：PSS阳极缓冲层在150 °C（在6CNBP-N的中间相温度区域中）退火时，在改性的PEDOT：PSS膜中形成更连续的网络，并且在上覆的P3 HT：PCBM活性层中形成更有序的微观结构和更高的P3 HT结晶，这主要是由6CNBP-N在其介晶中的自组装行为引起的，因此有利于激发解离、电荷传输和收集。在不进行有源层退火的情况下，获得了3.17%的功率转换效率（PCE）。结果表明，离子液晶结合了液晶特性和离子功能，是一种很有前途的PEDOT：PSS添加剂，可以同时改善PEDOT：PSS缓冲层和上覆活性层的性能，从而提高PSC的PCE。
A type of ionic liquid crystals, 4′-(N,N,N-trimethyl ammonium bromide hexyloxy)-4-cyanobiphenyl (6CNBP-N), was synthesized and explored as a novel additive to modify the PEDOT:PSS anode buffer layer for P3HT:PCBM polymer solar cells (PSCs). Due to the ionic functions of 6CNBP-N, the amount of PEDOT on top surface of PEDOT:PSS was increased with increasing amount of 6CNBP-N, leading to a rougher surface and better conductivity. Most strikingly, when the 6CNBP-N modified PEDOT:PSS anode buffer layer was annealed at 150 °C (in the mesophase temperature region of 6CNBP-N), a more continuous network in the modified PEDOT:PSS film and more ordered microstructure and higher crystallization of P3HT in the overlying P3HT:PCBM active layer were formed, mainly induced by the self-assembling behavior of 6CNBP-N in its mesomorphism, thus favoring excition dissociation, charge transport and collection. Without undergoing the annealing of active layers, the power conversion efficiency (PCE) of 3.17% was obtained. Our results showed that the ionic liquid crystals, which combined the liquid crystal properties and ionic functions, were a promising additive for PEDOT:PSS, which could improve the properties of the PEDOT:PSS buffer layer and the overlying active layer at the same time, thereby enhancing the PCE of PSCs.