A rectifying diode with hysteresis effect from an electroactive hybrid of carbazole-functionalized polystyrene with CdTe nanocrystals via electrostatic interaction  

作　　者：LIU JuQing QI XiaoYing JIANG Ting LIN ZongQiong CHEN ShuFen XIE LingHai FAN QuLi LING QiDan ZHANG Hua HUANG Wei 

机构地区：[1]Key Laboratory for Organic Electronics&Information Displays(KLOEID)and Institute of Advanced Materials(IAM),Nanjing University of Posts and Telecommunications,Nanjing 210046,China [2]School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore

出　　处：《Science China Chemistry》2010年第11期2324-2328,共5页中国科学(化学英文版)

基　　金：supported by the National Basic Research Pro-gram of China (973 projeet) (2009CB930600);National Natural Science Foundation of China (Grants 90406021,20704023,60876010,60706017,and 20774043);the Key Project of Chinese Ministry of Education (No. 104246, 208050, 707032, NCET-07-0446);the NSF of Jiangsu Province (Grants BK2008053, 08KJB510013, SJ209003and TJ207035);Research Fund for Postgraduate Innovation Project of Jiangsu Province (No. CX08B_083Z);STITP (No. 2009120)

摘　　要：One of the strategies to tune current-voltage behaviors in organic diodes is to combine field-induced charge transfer processes with schottky barrier.According to this principle,a rectifying diode with hysteresis effect was fabricated utilizing a hybrid of electroactive polystyrene derivative covalently tethered with electron-donor carbazole moieties and electrostatic linked with electron-acceptor CdTe nanocrystals.Current-voltage characteristics show an electrical switching behavior with some hysteresis is only observed under a negative bias,with three orders of On/Off current ratio.The hybrid material based rectifier exhibits a rectification ratio of six and its maximum rectified output current is about 5 × 10-5 A.The asymmetric switching is interpreted as the result of both field induced charge transfer and schottky barrier,capable of reducing the misreading of cross-bar memory.Meanwhile,chemical doping of CdTe nanocrystals instead of physical blend favor their uniform dispersion in matrix and stable operation of device.One of the strategies to tune current-voltage behaviors in organic diodes is to combine field-induced charge transfer processes with schottky barrier.According to this principle,a rectifying diode with hysteresis effect was fabricated utilizing a hybrid of electroactive polystyrene derivative covalently tethered with electron-donor carbazole moieties and electrostatic linked with electron-acceptor CdTe nanocrystals.Current-voltage characteristics show an electrical switching behavior with some hysteresis is only observed under a negative bias,with three orders of On/Off current ratio.The hybrid material based rectifier exhibits a rectification ratio of six and its maximum rectified output current is about 5 × 10-5 A.The asymmetric switching is interpreted as the result of both field induced charge transfer and schottky barrier,capable of reducing the misreading of cross-bar memory.Meanwhile,chemical doping of CdTe nanocrystals instead of physical blend favor their uniform dispersion in matrix and stable operation of device.

关 键 词：carbazole-functionalized polystyrene CdTe nanocrystal electrostatic hybrid hysteresis effect rectifying diode 

分 类 号：O631.3[理学—高分子化学]