In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 2R ( 1994-02-01), p. 1146-
Abstract:
The carrier transport and detailed carbonization processes of pristine (poly (hydrazocarbonyl-1,4-phenylenecarbonyl):PHP) film have been investigated as a function of heat-treatment temperature (HTT). Formation of (poly(1,3,4-oxadiazole-2,5-diyl-1,4-phenylene):POP) at HTT=400°C is confirmed and explained by the dehydration reaction of PHP molecular structure. Conductivity (σ) increases by 20 orders of magnitude from 10 -18 S/cm with HTT of 1000°C. The enhancement of σ with HTT up to 600°C has been interpreted by the increase of localized charge carrier and the most prominent effect of the enhancement of σ by HTT above 800°C has been explained by not only the increase of carrier density but also the increase of mobility. Even in the sample of low HTT ( 〈 500°C), σ is enhanced and its activation energy decreases upon electrochemical Li doping. On the other hand, in the sample of high HTT ( 800–1000°C) σ decreases slightly and its activation energy increases. Electrical conduction in the sample of low HTT ( 〈 600°C) is explained by three-dimensional variable range hopping (3D-VRH). On the other hand, in the nondoped and Li-doped sample of high HTT ( ≥600°C), the conduction process is explained by taking both 3D-VRH and metallic conduction processes into consideration.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.33.1146
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1994
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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