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Properties and applications of microcrystalline organic thin films

微晶有机薄膜的性能及应用

基本信息

批准号：
1709222
负责人：
Barry Rand
金额：
$ 36.85万
依托单位：
Princeton University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1709222&HistoricalAwards=false
关键词：
Properties applications microcrystalline organic thin

项目摘要

Abstract:Nontechnical: With some organic electronic devices now firmly established in the marketplace, it is becoming clear that organic electronics has the capacity to positively influence our technological ecosystem. However, the disordered films used in today's organic electronic devices hold the U.S. back in science and industry. Studies on single crystals of conjugated organic molecules have been critical in driving our understanding and testing the limits of various properties of organic semiconductors, such as mobility, exciton diffusion length, etc. Despite the very promising implications of such studies, highly disordered amorphous films are currently used and studied for applications, because these disordered films can be reproducibly formed into pinhole free films. Crystalline heterojunctions promise combined high exciton diffusion lengths and carrier mobilities and, when used in vertical heterojunction devices, crystalline films can dramatically expand the application domain of organic electronics. This project will 1) enable important technological and industrial breakthroughs in organic electronic devices, and 2) strengthen technological leadership of the U.S. and prepare the next generation of STEM graduates, including women and underrepresented groups, to follow a STEM career. The PI will engage with the public and students, and is particularly involved in active learning activities to establish role models across generational gaps.In this project, the PI will study organic semiconductor films and heterojunctions with crystal domain sizes of up to 1 mm, very ordered when compared to amorphous or nanocrystalline films employed today. Notably, this will be accomplished while still maintaining a low surface roughness and pinhole free coverage. The fact that organic single crystals reveal highly attractive properties with respect to disordered films means that organic semiconductors hold significantly more promise than what can be realized with the disordered films of today. This is in terms of charge and exciton transport, central to the operation of organic electronic devices. Charge carrier mobility is up to two orders of magnitude more in crystals compared to disordered films (up to 20 vs. 0.1-1 cm2/Vs) along with evidence of band transport, whereas exciton diffusion lengths are up to 2 microns vs. 5-30 nm. These large differences between disordered films and single crystals are thought to source from grain boundaries and structural disorder. Two scientific goals that will allow for future applications are: 1) demonstrate high-performance crystalline heterojunction solar cells with greatly reduced energy losses; 2) unveil the role of grain boundaries on exciton and charge transport.

摘要：非技术性：随着一些有机电子设备在市场上的稳固地位，有机电子产品有能力对我们的技术生态系统产生积极影响。然而，当今有机电子器件中使用的无序薄膜阻碍了美国的科学和工业发展。共轭有机分子单晶的研究一直是至关重要的，推动我们的理解和测试的各种性质的有机半导体，如迁移率，激子扩散长度等的限制，尽管这些研究非常有前途的影响，高度无序的非晶薄膜目前使用和研究的应用，因为这些无序的薄膜可以重复形成为针孔自由膜。结晶异质结承诺结合高激子扩散长度和载流子迁移率，并且当用于垂直异质结器件时，结晶膜可以显著地扩展有机电子学的应用领域。该项目将1）实现有机电子设备的重要技术和工业突破，2）加强美国的技术领导地位，并为下一代STEM毕业生（包括女性和代表性不足的群体）做好准备，以从事STEM职业。PI将与公众和学生接触，特别是参与积极的学习活动，以建立跨越代沟的榜样。在这个项目中，PI将研究有机半导体薄膜和异质结，其晶畴尺寸可达1 mm，与当今使用的非晶或纳米晶薄膜相比，非常有序。值得注意的是，这将在仍然保持低表面粗糙度和无针孔覆盖的同时实现。有机单晶相对于无序薄膜显示出高度吸引人的特性，这一事实意味着有机半导体比今天的无序薄膜更有希望。这是在电荷和激子传输方面，对有机电子器件的操作至关重要。与无序膜相比，晶体中的电荷载流子迁移率最多高达两个数量级（最多20对0.1-1 cm 2/Vs），沿着具有带传输的证据，而激子扩散长度最多为2微米对5-30 nm。无序薄膜和单晶之间的这些巨大差异被认为来源于晶界和结构无序。未来应用的两个科学目标是：1）展示高性能晶体异质结太阳能电池，大大降低能量损失; 2）揭示晶粒边界对激子和电荷传输的作用。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Study of local structure at crystalline rubrene grain boundaries via scanning transmission X-ray microscopy

DOI：
10.1016/j.orgel.2019.07.021
发表时间：
2019-11
期刊：
Organic Electronics
影响因子：
3.2
作者：
A. Foggiatto;Y. Takeichi;K. Ono;H. Suga;Y. Takahashi;Michael A. Fusella;Jordan T. Dull;Barry P Rand;K. Kutsukake;T. Sakurai
通讯作者：
A. Foggiatto;Y. Takeichi;K. Ono;H. Suga;Y. Takahashi;Michael A. Fusella;Jordan T. Dull;Barry P Rand;K. Kutsukake;T. Sakurai

33-1: Invited Paper: Exploring the Formation and Growth of Organic Semiconductors with mm-Scale Grains

33-1：特邀论文：探索毫米级颗粒有机半导体的形成和生长