Phenyl-C6i-butyric acid methyl ester PCBM

In order to learn about the true quantum efficiency of photogeneration one therefore has to study the photoinduced charge generation mechanism at faster time scales. Pump probe spectroscopy utilising a few optical-cycle laser pulses (5-6 fs) in the visible spectral range with broadband frequency conversion techniques [89] now makes it possible to study extremely fast optically-initiated events with unprecedented time resolution. Such a setup was used to time-resolve the kinetics of the charge transfer process from a polymer chain to a fullerene moiety in thin films of poly[2-methoxy, 5-(3, 7 -dimethyl-octyloxy)]-p-phenylene vinylene (MDMO-PPV) and [6,6]-phenyl C6i butyric acid methyl ester (PCBM). Solutions prepared from 1 wt% solutions of toluene on thin quartz substrates were studied. 

That detection limit was recently improved by Wang et al. [20]. The authors replaced the 16 mm vacuum-deposited CuPc-Ceo bilayer devices by 1 mm solution-processed polymer devices based on a 1 1 blend by weight of the conjugated polymer poly(3-hexylthiophene) (P3HT) and 6,6-phenyl-C6i-butyric acid methyl ester (PCBM), a soluble derivative of Ceo- The device has an active area of 1 mm and an external quantum efficiency of more than 50 % between 450 and 550 nm (Fig. 12). The device... 

Scheme 7.1 Molecular structures of poly[2-methoxy-5-(2 -ethyl-hexyloxy)-l,4-phenylene vinylene] (MEH-PPV), poly[2-methoxy-5-(3, 7 -dimethyloctyloxy)-l,4-phenylene vinylene] (MDMO-PPV), poly(3-hexylthiophene) (P3HT), [6]-phenyl-C6i-butyric acid methyl ester (PCBM) (see also Chap. 4 compounds 4.2, 3, 4 for more information about these polymers)...

PCBM [6,6]-Phenyl-C6i butyric acid methyl ester... 

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