有机-无机杂化钙钛矿自组装量子阱结构的能带调控和光电性能的研究  

Bandgap energy tuning and photoelectrical properties of self-assembly quantum well structure in organic-inorganic hybrid perovskites

作　　者：郑莹莹[1] 邓海涛[1] 万静[1] 李超荣[1] 

机构地区：[1]浙江理工大学理学院物理系

出　　处：《物理学报》2011年第6期646-652,共7页Acta Physica Sinica

基　　金：浙江省教育厅科研基金(批准号:Y201019087);浙江理工大学科研启动基金(批准号:0713676-Y);先进纺织材料与制备技术教育部重点实验室(浙江理工大学)优秀青年人才培养基金(批准号:2010QN05)资助的课题~~

摘　　要：有机-无机杂化钙钛矿材料具有分子尺度上调节能带结构的特点,在光、电、磁等领域均表现出了优异的性能.通过简单的旋涂方法,成功的制备了具有不同无机层层数的杂化钙钛矿材料(C6H13NH3)2(CH3NH3)n-1PbnI3n+1(简写为C6PbnI3n+1,n=1,2,3),系统研究了无机层层数对晶体结构、带隙、激子结合能、光致发光和光电性能的影响规律.研究表明,随着无机层层数的增加,杂化材料的激子吸收峰发生红移、能隙变窄、激子结合能减少.同时,激子因玻尔半径增大将更加容易分离,且材料的载流子传输性能增加,最终使光电导性能得到大幅度的提高.Organic-inorganic hybrid perovskite materials have excellent performance in optical,electrical and magnetic properties.The energy-band structure of the hybrid materials can be tuned at the molecular level.In this paper,thin films of hybrid perovskite（C6H13NH3）2（CH3NH3）n-1PbnI3n＋1（n=1,2,3,n is the number of two-dimensional inorganic-sheet） have been successfully prepared by a simple spin-coating method.The effects of the inorganic-sheet number（n） on the crystal structure,bandgap energy,exciton binding energy,photoluminescent emission and photocondunctive performance of the hybrid materials have been investigated systematically.With the increasing of inorganic-sheet number,the exciton absorption peak shows an obvious red shift,the bandgap becomes narrow,and the exciton binding energy decreases.Further,the exciton is separated into holes and electrons easily due to the expansion of the exciton Bohr radius and,moreover,the carrier mobilities are increased due to the increasing of inorganic-layer thickness.Consequently,the photocondunctivity of the films is greatly enhanced.

关 键 词：杂化钙钛矿 量子阱 带隙 光电性能 

分 类 号：TB303[一般工业技术—材料科学与工程]