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Direct Spectroscopic Evidence for a Photodoping Mechanism in Polythiophene and Poly(bithiophene‐ alt ‐thienothiophene) Organic Semiconductor Thin Films Involving Oxygen and Sorbed Moisture
Author(s) -
Zhuo JingMei,
Zhao LiHong,
Png RuiQi,
Wong LokeYuen,
Chia PerqJon,
Tang JieCong,
Sivaramakrishnan Sankaran,
Zhou Mi,
Ou Eric C.W.,
Chua SooJin,
Sim WeeSun,
Chua LayLay,
Ho Peter K.H.
Publication year - 2009
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200901120
Subject(s) - polythiophene , materials science , thiophene , semiconductor , organic semiconductor , moisture , hydroxide , polymer , ion , oxygen , conductive polymer , chemical engineering , organic chemistry , optoelectronics , chemistry , composite material , engineering
Direct infrared spectroscopic evidence has been obtained for photodoping of high mobility regioregular poly(3‐alkylthiophene) and poly[2,5‐bis(3‐alkyllthiophen‐2‐yl) thieno (3,2‐b)thiophene] with the attendant formation of hydroxide counter‐ions. This reveals the central role of dissolved water, explains the key features of degradation of the electrical characteristics of organic semiconductors in the ambient (see figure), and points to possible strategies to further improve their stability.