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Low Band Gap Conjugated Semiconducting Polymers
Author(s) -
Scharber Markus Clark,
Sariciftci Niyazi Serdar
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202000857
Subject(s) - homo/lumo , band gap , semiconductor , materials science , organic semiconductor , conjugated system , polymer , optoelectronics , direct and indirect band gaps , semimetal , wide bandgap semiconductor , nanotechnology , chemistry , organic chemistry , molecule , composite material
Important parameters of an organic semiconductor material are the electronic band gap ( E g ) and the position of highest occupied and lowest unoccupied bands versus vacuum. These bands are called valence and conduction band for inorganic semiconductors. For organic semiconductors the bands defining the band gap are often called highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). One advantage of semiconducting polymers is the ability to tune the band gap and the position of HOMO and LUMO levels by molecular chemical design. The organic photovoltaic solar cells need absorbers with a smaller bandgap to maximize the power conversion efficiency of these devices. There are several chemical strategies to synthesize low band gap polymers for optoelectronic applications. In this manuscript, an updated overview on the current status of these low band gap conjugated polymers will be given. The design principles of low band gap polymers, the properties of the resulting materials, and important applications and devices realized with this material class will be briefly discussed.