PCPDTBT

Figure 1.64 Comparison between the solar spectrum (AM 1.5G) and the absorption spectra of the CPs P3HT and PCPDTBT. Reprinted from [558] with permission from Wiley.

For example, the effectiveness of low-bandgap polymers in absorbing more light has been demonstrated by comparing P3HT CdSe- and PCPDTBT CdSe-based devices [187]. It can be seen from Figure 3.26a that low-bandgap CP poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,l-b 3,4-b0] -dithiophene)-alt-4,7-(2,l, 3-benzothiadiazole)] (PCPDTBT)... 

Figure 3.26 Comparison between P3HT CdSe and PCPDTBT CdSe blends.

Y. Zhou, M. Eck, C. Veit, B. Zimmermann, F. Rauscher, P. Niyamakom, S. Yilmaz, I. Dumsch, S. Allard, U. Scherf, Efficiency Enhancement for Bulk-Heterojunction Hybrid Solar Cells Based on Acid Treated CdSe Quantum Dots and Low Bandgap Polymer PCPDTBT. Solar Energy Materials and Solar Cells 2011,95,1232-1237. 

Y. Zhou, et al. Efficiency enhancement for bulk-heterojunction hybrid solar cells based on acid treated CdSe quantum dots and low bandgap polymer PCPDTBT. Solar Energy Materials Solar Cells, 2011.95(4) p. 1232-1237. 

Figure1.4 HSP diagram for solutes at 60°C with 34 solvents, 2.5gl forPSHT, PCPDTBT, and...

Figure 1.13 j-V characteristics of PCPDTBT/PC71BM composite fiims with various additives none (biack), 1,8-octanedithioi (red), 1,8-dichoiorooctane... 

Figure 1.14 Schematic depiction of the role of the processing additive in the self-assembly of bulk heterojunction blend materials (a) and structures of PCPDTBT, PC7iBM, and additives (b). (Adapted from Ref [84].)...

Morana et al. investigated the effect of ODT on the formation of the charge transfer complex (CTC) for C-PCPDTBT and Si-PCPDTBT [91]. Despite the pristine C-PCPDTBT, no changes were observed in the absorption spectrum of the Si-PCPDTBT films prepared with ODT. Enhanced phase segregation in the C-PCPDTBT films upon addition of ODT caused increase in the molecular luminescence to CT luminescence ratio. This is due to the reduced concentration of CT complexes by a decrease in the contact area between the polymer and the fullerene because of phase separation. 

Figure 1.16 Semilogarithmic Stern-Volmer plot (Fq/F— 1) of (a) polymer and (b) fullerene fluorescence quenching versus the fullerene content Xpc BM (defined as the weight ratio between the fullerene and the total solid content) for the three polymerfullerene blends considered Si-bridged (squares), C-bridged (circles), C-bridged/ODT (triangles). The intensity peaks we considered are positioned at 830 nm forthe Si-PCPDTBT and at 850 nm for the C-PCPDTBT polymer, while the PCpiBM...

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