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Bulk Heterojunction Solar Cells – Tuning of the HOMO and LUMO Energy Levels of Pyrrolic Squaraine Dyes (Eur. J. Org. Chem. 28/2011)
Author(s) -
Beverina Luca,
Drees Martin,
Facchetti Antonio,
Salamone Matteo,
Ruffo Riccardo,
Pagani Giorgio A.
Publication year - 2011
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201190075
Subject(s) - homo/lumo , substituent , chemistry , acceptor , organic solar cell , photochemistry , open circuit voltage , stereochemistry , organic chemistry , voltage , physics , molecule , quantum mechanics , polymer
The cover picture shows how the HOMO and LUMO energy levels of hydrazone end‐capped pyrrolic squaraine compounds for organic photovoltaic devices can be efficiently tuned by means of the substituent effect. The capability of tuning the LUMO position is of outmost importance to obtain efficient light‐induced charge transfer from the squaraine and the PC71BM acceptor. Moreover, the control of the HOMO energy enables the tuning of the device open circuit voltage. The squaraine general structure and synthetic access, along with their energy‐level diagram as a function of the substituent effect, are shown against a background of the sun aura atop the hills of the Joshua Tree desert in California. Details are discussed in the article by L. Beverina et al. on p. 5555 ff.