Bandgaps control

Synthetic principles for bandgap control in tt-conjugated systems of poly-(thiophene) and related systems with fused thiophene rings 97CRV173. 

Roncali, J., 1997. Synthetic principles for bandgap control in linear jr-conjugated systems. Chem. Rev. 97, 173-206. 

In this context, this section deals with functionalized PTs developed for sensors, electrochromic devices, and plastic electronic devices as well as metal-containing PTs emphasizing on the relationships between bandgap control of the PT backbone and the corresponding application. 

Brisset, H., P. Blanchard, B. Illien, A. Riou, and J. Roncali. 1997. Bandgap control through reduction of bond length alternation in briged poly(dithienylethylene)s. Chem Commun 569-570. 

The above-mentioned aspect of regioregularity in PTs plays an important role in their bandgap control. This is also discussed at length in the Chapter 2. The random polymerization of 3-alkylthiophenes leads to a large degree of HH coupling that decreases the effective conjugation in the chain due to... 

Miklos Kertesz and co-workers, in Chapter 7, gives theoretical perspectives on the question that spurred a great number of synthetic efforts - the bandgap control in polythiophene. Although a one-time holy grail of the field, a vanishingly low-bandgap polymer, is still not within reach, the concepts developed on this journey have important practical applications, e.g. in photovoltaic materials. 

King, R.R. Fetzer, C.M. Colter, P.C. Edmondson, K.M. Ermer, J.H. Cotal, H.L. Hojun Yoon Stavrides, A.P. Kinsey, G. Krut, D.D. Karam, N.H., High-efficiency space and terrestrial multijunction solar cells through bandgap control in cell structures. Proc. 29th IEEE Photovoltaic Specialists Conference, IEEE, 2002 776-81. 

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