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首页> 外文期刊>RSC Advances >BODIPY derivatives with near infra-red absorption as small molecule donors for bulk heterojunction solar cells
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BODIPY derivatives with near infra-red absorption as small molecule donors for bulk heterojunction solar cells

机译：具有近红外吸收能力的BODIPY衍生物作为体异质结太阳能电池的小分子供体

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The study of small donor molecules as the active component of organic solar cells continues to attract considerable attention due to the range of advantages these molecules have over their polymeric counterparts. Here we report the synthesis and solar cell fabrication of three BODIPY small molecule donors. Two of the dyes feature triphenylamine and phenothiazine as donor units attached to the meso and α-positions of the BODIPY core ( TPA-PTZ-DBP and PTZ-TPA-BDP ). Additionally, we have synthesised a push–pull derivative featuring phenothiazine moieties in the α-positions and a nitrobenzene in the meso -position ( N-TPA-BDP ) in order to investigate what effect this type of functionalisation has on the photovoltaic properties compared to the other dyes. The optoelectronic properties were investigated and the dyes showed broad absorption in the near-infrared with high extinction coefficients. Electrochemical measurements indicated good reversibility for the dyes redox processes. In contrast with the all-donor functionalised systems, N-TPA-BDP demonstrated extensive HOMO–LUMO overlap by DFT. The dyes were investigated as donor molecules in bulk heterojunction solar cells along with PC _(71) BM , and under optimal donor to acceptor ratio PTZ-TPA-BDP showed the highest PCE of 1.62%. N-PTZ-BDP : PC _(71) BM was the only blend to further improve upon thermal annealing reaching the highest conversion efficiency among the dyes of 1.71%. A morphology comprised of finely mixed donor and acceptor components is observed for BHJ blends of each of the three donors at their optimum fullerene content. Upon thermal annealing, these morphological features remain mostly the same for PTZ-TPA-BDP : PC _(71) BM and TPA-PTZ-DBP : PC _(71) BM blends whereas for N-PTZ-BDP : PC _(71) BM the domains show a larger size. These dyes show that phenothiazine functionalisation of BODIPY is useful for solar cells because it gives strong and broad absorption extending to the near infra-red and materials with reversible redox properties – both of which are desirable for organic solar cells.
机译：作为有机太阳能电池活性成分的小型施主分子的研究由于其相对于聚合物对应分子的优势范围而不断引起人们的关注。在这里，我们报告了三个BODIPY小分子供体的合成和太阳能电池的制造。两种染料的特征是，三苯胺和吩噻嗪作为供体单元附着在BODIPY核的内消旋和α位（TPA-PTZ-DBP和PTZ-TPA-BDP）。此外，为了研究这种功能化对光电性能的影响，我们合成了一种推拉衍生物，其特征在于在α位的吩噻嗪部分和在中间位的硝基苯（N-TPA-BDP）。其他染料。研究了光电性能，染料在高消光系数的近红外光中显示出广泛的吸收性。电化学测量表明染料氧化还原过程具有良好的可逆性。与全供体功能化系统相反，N-TPA-BDP通过DFT证明了HOMO-LUMO的广泛重叠。将该染料作为整体异质结太阳能电池中的供体分子与PC_（71）BM一起进行研究，在最佳供体与受体比率下，PTZ-TPA-BDP的PCE最高，为1.62％。 N-PTZ-BDP：PC_（71）BM是唯一的混合物，可在热退火后进一步改善，达到染料中最高的转化效率，达到1.71％。对于三种供体的BHJ共混物，在其最佳富勒烯含量下，观察到由精细混合的供体和受体成分组成的形态。通过热退火，PTZ-TPA-BDP：PC _（71）BM和TPA-PTZ-DBP：PC _（71）BM共混物的这些形态特征基本相同，而N-PTZ-BDP：PC _（71 ）BM域显示较大的大小。这些染料表明，BODIPY的吩噻嗪官能化可用于太阳能电池，因为它能提供强而宽的吸收能力，延伸至近红外光以及具有可逆氧化还原特性的材料-两者都是有机太阳能电池所需要的。

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