基于PVK/PbS纳米晶有机无机复合薄膜电双稳器件性能研究  

Organic/inorganic composite electrical bistable devices based on composite of poly(N-vinylcarbazole) and lead sulfide nanocrystals

作　　者：刘娟[1,2] 李云白[1] 侯延冰[2] 王越[2] 吕龙峰 

机构地区：[1]北京交通大学理学院物理系,北京100044 [2]北京交通大学理学院光电子技术研究所,北京100044

出　　处：《液晶与显示》2016年第7期643-648,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61475017;No.61275175)~~

摘　　要：通过简单旋涂方法,制备了一种基于硫化铅(PbS)纳米晶与聚乙烯基咔唑(PVK)的有机/无机复合薄膜电双稳器件,并对所制备的器件进行性能测试及其电荷传输机制研究。首先采用热注入的方法制备了尺寸均一的立方形PbS纳米晶,然后将PbS纳米晶与PVK聚合物混合作为活性层材料,制备了有机/无机复合薄膜电双稳器件。该器件展示了良好的电双稳特性并且可以实现稳定的"读-写-读-擦"操作。器件的最大电流开关比能够达到104。并进一步对器件在正向电压下的I-V曲线进行了理论拟合,发现在不同电流传导状态下,器件符合不同的电传导模型。进而分析了该电双稳器件中的电荷传输机制,认为在电场的作用下,发生在纳米晶与聚合物之间的电场诱导电荷转移是产生电双稳特性的主要原因。An organic / inorganic composite electrical bistable device has been fabricated by utilizing hybrid lead sulfide （PbS）nanocomposite and poly（N-vinylcarbazole）（PVK）film.And the device per-formance has been tested in order to analyze the charge transport mechanism.First,the cube-shaped PbS nanocrystals were synthesized by the thermal injection method,then electrical bistable device was fabricated by utilizing composite of poly（N-vinylcarbazole）and lead sulfide nanocrystals as the active layer.The device exhibits significant electrical bistability and repeatable operation of “read-write-read-erase”is also achieved.The maximum current ratio between the high-conducting state （ON state）and＆nbsp;low-conducting state （OFF state）can reach up to 10 4 .The carrier transport mechanisms in the posi-tive voltage region of the ON state and OFF state are described by using different conduction models, respectively.The observed conductance switching is attributed to the electric-field-induced charge transfer between the nanocrystals and the polymer,and charge trapping/detrapping in the nanocrys-tals.

关 键 词：有机无机复合薄膜 电双稳器件 开关比 PBS 纳米晶 

分 类 号：O472.4[理学—半导体物理]