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用改进的Naarmann方法合成聚乙炔,用碘液相掺杂,及功率连续可调的氩离子激光器作光源,研究了掺杂对反式聚乙炔稳态光电导的影响。发现掺杂可使其光电导率比未掺杂的增大3~4个数量级;并且在较高的入射光强下,掺杂样品都出现饱和现象。用光子能量大于聚乙炔能隙的光照射时,聚乙炔中产生的光生正负带电孤子对,经复合衰变放出声子,帮助掺杂生成的束缚带电孤子跃出势阱,成为自由带电载流子的模型,分析和讨论了掺杂引起光电导率显著增大和在较高光强下趋于饱和的原因。
The modified Naarmann method was used to synthesize polyacetylene. The effect of doping on steady-state photoconductivity of trans-polyacetylene was studied by doping with iodine solution and argon-ion laser with continuously variable power. It is found that the doping can increase the photoconductivity by 3 to 4 orders of magnitude compared with the undoped ones. At high incident light intensity, the doping samples are saturated. When the photon energy is greater than that of the polyacetylene energy gap, the photogenerated positive and negative charged soliton pairs generated in the polyacetylene emit phonons through complex decay to help the bound charged solitons generated by the doping to jump out of the potential well and become free-charged carriers Sub-model, analyzes and discusses the reasons why doping leads to a significant increase in photoconductivity and to saturation at higher light intensities.