TY - JOUR
T1 - Investigating Thermoelectric Stability under Encapsulation Using PEI-Doped CNT Films as a Model System
AU - Abdallah, Fatma
AU - Ciammaruchi, Laura
AU - Jiménez-Arguijo, Alex
AU - Duraia, El Shazly M.
AU - Ragab, Hossam S.
AU - Dörling, Bernhard
AU - Campoy-Quiles, Mariano
N1 - Publisher Copyright:
© 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/7/1
Y1 - 2020/7/1
N2 - The stability of organic semiconductors is an important topic, which in the case of organic thermoelectrics (OTEs), has not yet got the attention it deserves. This work presents a simple method which allows to characterize the stability of OTEs, using patterned ITO substrates to electrically contact encapsulated samples. The method is applied to n-doped carbon nanotube films, a well-suited reference system due to their sensitivity to changes in doping level, and used to compare the effectiveness of different encapsulation methods. In the observed films, oxygen adsorption leads to a gradual p-doping. Among the investigated barrier materials, glass performs best. Flexible alternatives like transferred films of barrier polymers also show promise, while barrier films deposited by dropcast performed worse, likely due to their inhomogeneity. Finally, Raman imaging is shown to be a useful technique to investigate degradation in OTEs.
AB - The stability of organic semiconductors is an important topic, which in the case of organic thermoelectrics (OTEs), has not yet got the attention it deserves. This work presents a simple method which allows to characterize the stability of OTEs, using patterned ITO substrates to electrically contact encapsulated samples. The method is applied to n-doped carbon nanotube films, a well-suited reference system due to their sensitivity to changes in doping level, and used to compare the effectiveness of different encapsulation methods. In the observed films, oxygen adsorption leads to a gradual p-doping. Among the investigated barrier materials, glass performs best. Flexible alternatives like transferred films of barrier polymers also show promise, while barrier films deposited by dropcast performed worse, likely due to their inhomogeneity. Finally, Raman imaging is shown to be a useful technique to investigate degradation in OTEs.
KW - carbon nanotubes
KW - degradation
KW - n-doping
KW - organic thermoelectricity
KW - stability
UR - http://www.scopus.com/inward/record.url?scp=85085475194&partnerID=8YFLogxK
U2 - 10.1002/admt.202000256
DO - 10.1002/admt.202000256
M3 - Article
AN - SCOPUS:85085475194
SN - 2365-709X
VL - 5
JO - Advanced Materials Technologies
JF - Advanced Materials Technologies
IS - 7
M1 - 2000256
ER -