Noone Kevin M, Anderson Nicholas C, Horwitz Noah E, Munro Andrea M, Kulkarni Abhishek P, Ginger David S
Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA.
ACS Nano. 2009 Jun 23;3(6):1345-52. doi: 10.1021/nn800871j.
We use photoluminescence (PL) quenching and photoinduced absorption (PIA) spectroscopy to study charge transfer in bulk heterojunction blends of PbSe quantum dots with the semiconducting polymers poly-3-hexylthiophene (P3HT) and poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-para-phenylene vinylene] (MDMO-PPV). PIA spectra from the PbSe blends are compared to spectra from similar blends of the polymers with phenyl-C(61)-butyric acid methyl ester (PCBM) and blends with CdSe quantum dots. We find that the MDMO-PPV PL is quenched, and the PL lifetime is shortened upon addition of PbSe quantum dots, while the PL of the P3HT is unaffected upon blending. However, for PbSe blends with both polymers, the PIA spectra show very little polaronic signal, suggesting that few, if any, long-lived charges are being produced by photoinduced charge transfer.
我们使用光致发光（PL）猝灭和光致吸收（PIA）光谱来研究硒化铅量子点与半导体聚合物聚-3-己基噻吩（P3HT）和聚[2-甲氧基-5-（3'，7'-二甲基辛氧基）-对苯撑乙烯撑]（MDMO-PPV）的本体异质结共混物中的电荷转移。将硒化铅共混物的PIA光谱与聚合物与苯基-C（61）-丁酸甲酯（PCBM）的类似共混物以及与硒化镉量子点的共混物的光谱进行比较。我们发现，添加硒化铅量子点后，MDMO-PPV的PL被猝灭，且PL寿命缩短，而P3HT的PL在共混后不受影响。然而，对于与这两种聚合物的硒化铅共混物，PIA光谱显示出非常少的极化子信号，这表明光致电荷转移产生的长寿命电荷很少（如果有的话）。
