胶体量子点表界面工程
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- 英文论文题名：Colloidal quantum dot surface and interface engineering
- 论文作者：王瑞丽 ; 尚跃群 ; 周文佳 ; Edward H.Sargent ; 宁志军
- 英文论文作者：Ruili Wang ; Yuequn Shang ; Wenjia Zhou ; Edward H.Sargent ; Zhijun Ning ; School of Physical Science and Technology ; Shaghai Tech University ; Department of Electrical and Computer Engineering ; University of Toronto
- 年：2016
- 作者机构：上海科技大学物质科学与技术学院;加拿大多伦多大学电子工程系;
- 论文关键词：胶体量子点 ; 太阳能电池 ; 胶体纳米颗粒 ; 光电材料 ; 光电器件
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十六分会：纳米材料合成与组装
- 语种：中文
- 分类号：O648.1;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十六分会 ; 纳米材料合成与组装
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：180k
- 原文格式：D
- 会议级别：全国
摘要
胶体量子点是一种分散在溶液中的纳米颗粒。由于量子限域效应的存在,胶体量子点可以通过尺寸和形状变化来调节材料的光学和电学性质,是新一代溶液可处理光电子器件如太阳能电池、光探测器、发光二极管的理想材料之一。我们通过量子点表面配体的改进和配体交换方法的优化,大幅降低了量子点表面的缺陷。同时基于配体工程的方法实现了对量子点薄膜物理性质的调控,并在此基础上设计并构建了一些新型的器件结构。这两种方法的结合大幅提高了量子点太阳能电池的转换效率,基于这些方法的采用,目前胶体量子点太阳能电池经过认证的转换效率从6%提高到目前超过10%的效率[1-5]。最近我们利用溶液处理的方法,实现了钙钛矿在量子点外的外延生长(图1),开发了一种在量子点薄膜中进行原位表面钝化的方法,基于这种量子点钙钛矿复合材料,实现了4.9%的红外量子点电致发光器件效率[6]
Colloidal quantum dots(CQDs) are fast-improving materials for next-generation solution-processed optoelectronic devices such as solar cells, light emitting diodes, and photodetectors. However, the utilization of CQDs for optoelectronic materials is limited by surface defects and inefficient transport of electrons and holes. Nanoscale CQDs exhibit a high surface to volume ratio, and a remarkable fraction of atoms making up the quantum dots are thus located on the surface. CQD surface states therefore play a critical role in determining its properties, influencing luminescence, defect energy levels, and doping type and density. In the last five years, halide ligands were applied to CQD solar cells, and these not only improved charge carrier mobility, but also reduced defects on the surface. With the inclusion of halide ligands, CQD solar cell efficiency increased rapidly from initial 5% in 2010 to the latest certified values closely approaching 10% [1-6].
Colloidal quantum dots(CQDs) are fast-improving materials for next-generation solution-processed optoelectronic devices such as solar cells, light emitting diodes, and photodetectors. However, the utilization of CQDs for optoelectronic materials is limited by surface defects and inefficient transport of electrons and holes. Nanoscale CQDs exhibit a high surface to volume ratio, and a remarkable fraction of atoms making up the quantum dots are thus located on the surface. CQD surface states therefore play a critical role in determining its properties, influencing luminescence, defect energy levels, and doping type and density. In the last five years, halide ligands were applied to CQD solar cells, and these not only improved charge carrier mobility, but also reduced defects on the surface. With the inclusion of halide ligands, CQD solar cell efficiency increased rapidly from initial 5% in 2010 to the latest certified values closely approaching 10% [1-6].
引文
[1][1]Ruili Wang,Yuequn Shang,Pongsakorn Kanjanaboos,Wenjia Zhou,Zhijun Ning*,and Edward H.Sargent*,Energy&Environmental Science,2016,DOI:10.1039/C5EE03887A.
[2]Zhijun Ning,et al.,Nature,2015,523,324-328.
[3]Zhijun Ning,et al.,,Nat.Mater.,2014,13,822-828.
[4]Zhijun Ning,et al.,Adv.Mater.2013,25,1719-1723.
[5]Zhijun Ning,et al.,,Adv.Mater.2012,24,6295-6299.
[6]Xiwen Gong,Zhenyu Yang,Grant Walters,Riccardo Comin,Zhijun Ning,Eric Beauregard,Valerio Adinolfi,Oleksandr Voznyy and Edward H.Sargent*,Nat.Photonics,2016,10,253-257.
[2]Zhijun Ning,et al.,Nature,2015,523,324-328.
[3]Zhijun Ning,et al.,,Nat.Mater.,2014,13,822-828.
[4]Zhijun Ning,et al.,Adv.Mater.2013,25,1719-1723.
[5]Zhijun Ning,et al.,,Adv.Mater.2012,24,6295-6299.
[6]Xiwen Gong,Zhenyu Yang,Grant Walters,Riccardo Comin,Zhijun Ning,Eric Beauregard,Valerio Adinolfi,Oleksandr Voznyy and Edward H.Sargent*,Nat.Photonics,2016,10,253-257.