基于热活化延迟荧光材料的有机肖特基结光伏电池的介电特性基础研究

项目名称： 基于热活化延迟荧光材料的有机肖特基结光伏电池的介电特性基础研究

项目编号： No.61504077

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 郑燕琼

作者单位： 上海大学

项目金额： 22万元

中文摘要： 2011年首次报导的有机肖特基结光伏电池因其结构简单且呈现出超高光电流引起国内外的广泛关注。其相关物理机理研究主要集中在高开路电压形成机理及空穴传输模型的探讨，关于具有长激子寿命的热活化延迟荧光(TADF)材料在肖特基结中的应用，及给/受体介电特性对电池性能的影响并无深入研究。针对这一现状，本项目以含有超低TADF给体浓度的有机肖特基结电池为研究对象，探索光生载流子和TADF给体同系物的空间结构对材料和器件的介电特性的调控，及其影响空间电荷分布、内建电场与电池性能的规律。重点研究肖特基结中给/受体稳态介电特性与相应器件电容在暗条件和不同光照强度下的变化，建立材料介电特性对肖特基结中激子分离与复合、载流子长程传输、电荷富集和电荷转移态离域的调控模型。通过新材料如钙钛矿和TADF给体复合膜、给体用作受体等的应用和结构改善进一步提升电池性能。本项目将为新给/受体分子设计和器件结构优化提供思路。

中文关键词： 有机肖特基结光伏电池；介电特性；热活化延迟荧光；光生载流子

英文摘要： The organic Schottky photovoltaic cell (OPV), a novel structure firstly reported in 2011, has received wide interest because of its simple cell architecture and ultrahigh photocurrent. The related investigation of the physical mechanism mainly focuses on the formation of high open circuit voltage and the hole-transport model. There are limited reports about the application of thermally activated delayed fluorescence (TADF) materials that possess long exciton-lifetime on OPVs, and about the influence of dielectric properties on OPV device performance. Aiming at this problem, the subject investigated in the project centralizes on the organic Schottky junction including small amount of TADF donor. The project reveals the regulation mechanism of photo-generated carrier and molecule structure of TADF homologues on the dielectric property of donors/acceptors and organic Schottky junctions, and its influence on the space charge distribution, build-in potential, and device performance. We primarily investigate the change of the static dielectric property of donor/acceptor and the device capacitance in dark and under the various illumination, and build a model how the dielectric property of donor/acceptor modulate the exciton dissociation and recombination, carrier long-range transfer, charge accumulation, and the delocalization of charge transfer states in Schottky junctions. The device performance will be further improved by the application of novel donors/acceptors, such as the composite of perovskite and TADF donor, the new acceptor which is traditionally used as donor, etc., and by the modification of device structures. The project would help to direct the design of novel photovoltaic materials and the improvement of cell structures.

英文关键词： Organic Schottky photovoltaic cell;Dielectric property;Thermally activated delayed fluorescence;Photogenerated carrier