Photorefractive performance of poly(triarylamine)‐Based polymer composites: An approach from the photoconductive properties

Photorefractive (PR) and photoconductive properties of methyl‐substituted poly(triarylamine) (PTAA) based PR composite is presented. PR composite consisted of PTAA, piperidinodicyanostyrene, (2,4,6‐trimethylphenyl)diphenylamine, and 6,6]‐phenyl‐C61‐butyric acid methyl ester. Photocurrent is simultaneously measured when a transient degenerate four wave mixing is recorded. Diffraction efficiency of 16.6%, response time of 5 ms, and sensitivity of 43 cm² J^?1 are measured under an applied field of 45 V μm^?1 and 632.8 nm illumination with the intensity of 1.5 W cm^?2. Response time of 10.2 ms with diffraction efficiency of 47.0% is obtained under a same field and 532 nm illumination with the intensity of 0.427 W cm^?2. Higher diffraction and faster response is due to the large photocurrent in the order of hundreds μA measured. The resultant trap density is in the order of 10¹⁴ cm^?3. Thus, space–charge field less than 1 V μm^?1 is evaluated, which limits the PR response. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 502–508