Photoconductive polymers produced by thermal or high-energy radiation treatment

Chart 2.7 Chemical structure of poly[bis(2-naphthox-y)phosphazene], P2NP. 

Polar dopants also cause an increase in the quantum yield, but the hole mobility is concomitantly decreased [55]. 

Fullerene, Ceo, is quite an effective dopant. It is an excellent electron acceptor, capable of accepting up to six electrons. Photoinduced electron transfer from conducting polymers such as poly(3-octylthiophene), P30T, and poly[2-methoxy-5-(2 -ethylhexyloxy)-p-phenylene vinylene], MEH-PPV, to fullerene Ceo occurs on a timescale of less than 1 ps. A Ceo content of a few percent is sufficient to enhance 0CC in tbc ps time domain by more than an order of magnitude [56]. 

Photoconductive polymers produced by thermal or high-energy radiation treatment 

Certain polymers become photoconductive upon exposure to heat or high-energy radiation, an aspect that has been reviewed by Mylnikov [3]. For example, polyacrylonitrile (maximum sensitivity at 2 = 420 nm) or polypyrrole (maximum sensitivity at 2 = 500-600 nm) exhibit photoconductivity after heat treatment, which is thought to be due to the formation of conjugated double bonds. High- 

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