Photoconductivity Studies on an Organometallic Ladder Polymer, Bis (Catena-Poly(Methylarsenic)).
STATE UNIV COLL PLATTSBURGH NY DEPT OF PHYSICS
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Photoconductivity studies on single crystal samples of the organometallic ladder polymer bis catena-polymethylarsenic, BCPMA, have been made at room temperature in the spectral range 400 - 1700 nm 0.73 - 3.1 eV. All samples exhibited intrinsic photoconductivity behavior for photon energies greater than 1.55 eV. This value of the optical energy gap is in excellent agreement with the thermal energy gap found from electrical conduction studies on the same samples. Below the energy gap substantial impurity photoconduction is seen, probably due to iodine impurities. Explanations are suggested for the flash photoresponse and the subsequent quenching negative photoconduction seen in the impurity region, including deep traps and interimpurity hopping recombination. The photoresponse is found to be field dependent and in the extrinsic region is governed by the bulk-limited Poole-Frenkel effect. Modified author abstract
- Solid State Physics