Romero-Servin Sergio, Villa Manuel de Anda, Carriles R, Ramos-Ortíz Gabriel, Maldonado José-Luis, Rodríguez Mario, Güizado-Rodríguez M
Centro de Investigaciones en Óptica, A.P. 1-948, León, Gto. 37150, Mexico.
Centro de Investigación en Ingeniería y Ciencias Aplicadas (CIICAp), Universidad Autónoma del Estado de Morelos, Av. Universidad No. 1001, Col. Chamilpa, Cuernavaca, Mor. C.P. 62209, Mexico.
Materials (Basel). 2015 Jul 13;8(7):4258-4272. doi: 10.3390/ma8074258.
Our group previously reported the synthesis of four polythiophene derivatives (P1-P4) used for solar cells. The cells were prepared under room conditions by spin coating, leading to low efficiencies. However, after the addition of 6-nitro-3-(E)-3-(4-dimethylaminophenyl)allylidene)-2,3-dihydrobenzo[d]-[1,3,2] oxazaborole (M1) to their active layers, the efficiencies of the cells showed approximately a two-fold improvement. In this paper, we study this enhancement mechanism by performing ultrafast transient absorption (TA) experiments on the active layer of the different cells. Our samples consisted of thin films of a mixture of PCBM with the polythiophenes derivatives P1-P4. We prepared two versions of each sample, one including the molecule M1 and another without it. The TA data suggests that the efficiency improvement after addition of M1 is due not only to an extended absorption spectrum towards the infrared region causing a larger population of excitons but also to the possible creation of additional channels for transport of excitons and/or electrons to the PCBM interface.
我们团队之前报道了用于太阳能电池的四种聚噻吩衍生物（P1 - P4）的合成。这些电池在室温条件下通过旋涂制备，导致效率较低。然而，在其活性层中添加6 - 硝基 - 3 -（E）- 3 -（4 - 二甲基氨基苯基）亚烯丙基）- 2,3 - 二氢苯并[d]-[1,3,2]氧杂硼杂环戊烯（M1）后，电池效率提高了约两倍。在本文中，我们通过对不同电池的活性层进行超快瞬态吸收（TA）实验来研究这种增强机制。我们的样品由PCBM与聚噻吩衍生物P1 - P4的混合物薄膜组成。我们为每个样品制备了两个版本，一个包含分子M1，另一个不包含。TA数据表明，添加M1后效率提高不仅是由于吸收光谱向红外区域扩展导致更多激子产生，还可能是由于为激子和/或电子向PCBM界面传输创造了额外通道。
