Polymer photonic devices based on mixed ionic/electronic conductors: device and materials physics

基于混合离子/电子导体的聚合物光子器件：器件和材料物理

• 批准号: RGPIN-2015-05344
• 负责人: Gao, Jun
• 金额: $ 1.6万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=678840
• 关键词: Polymer; photonic; devices; based; mixed

Semiconductor photonic devices such as light-emitting diodes (LEDs), solar cells, photodiodes, and diode lasers are indispensible in our technology- and information-driven world. While these devices are still mainly based on silicon or group III-V compounds, various organic semiconductors have emerged as potential candidates for next-generation applications that require even higher functionality and less energy consumption. Semiconducting polymers are especially attractive because they have the mechanical and processing advantages of polymeric materials as well as being optically and electrically interesting. ******To make "plastic electronics" a reality, polymer semiconductors need to be better understood and fully exploited not only in their pure form, but also when "doped." The field of "conductive polymers" (2000 Nobel Prize in Chemistry) came into existence when polyacetylene was discovered to exhibit vastly improved conductivity when chemically doped. Most polymer devices to date are based on pristine polymers. An exception is the polymer light-emitting electrochemical cell (LEC), whose active layer is a mixed ionic/electronic conductor (MIEC). The MIEC of an LEC is electrochemically doped in situ during operation, and a light-emitting p-n or p-i-n junction is formed between the differently doped regions. The LECs possess many desirable device characteristics as a result of doping. The chief challenges facing MIEC devices such as LECs is their inferior operational lifetime and the lack of understanding of the underlying physics. This is in large part due to the complex nature of MIEC devices, which possess at least four different charge carriers that can interact. ******In our proposed research, various polymer MIEC devices will be explored and investigated in depth in order to deal with the challenges. In particular, we will perform unprecedented, concerted scanning photocurrent, photoluminescence and absorption measurements of extremely large, frozen planar cells in order to better understand the electronic structure of MIEC junctions.  In addition, we strive to achieve long lasting MIEC devices ready for practical applications. The proposed research will build on my group's extensive experience working on MIEC light-emitting cells and photovoltaic cells that has resulted in nearly 30 publications in top international journals in recent years. My group also developed a suite of powerful experimental techniques ideally suited for the study of MIEC devices. These include time-lapse fluorescence imaging, frozen-junction and controlled junction relaxation, scanning electrical probing of conductivity and electric potential, and concerted scanning photocurrent and photoluminescence probing techniques. The proposed research offers excellent opportunities for the training of HQPs that will prepare them for a career in academic research or industrial R&D. **

半导体光子器件，如发光二极管（led）、太阳能电池、光电二极管和二极管激光器，在我们这个技术和信息驱动的世界中是不可或缺的。虽然这些器件仍然主要基于硅或III-V族化合物，但各种有机半导体已经成为下一代应用的潜在候选者，这些应用需要更高的功能和更低的能耗。半导体聚合物特别具有吸引力，因为它们具有聚合物材料的机械和加工优势，以及光学和电学上的有趣。******为了使“塑料电子”成为现实，需要更好地理解和充分利用聚合物半导体，不仅在其纯形式，而且在“掺杂”时。“导电性聚合物”（2000年诺贝尔化学奖）领域的出现，是因为人们发现在化学掺杂的情况下，聚乙炔的导电性大大提高。迄今为止，大多数聚合物设备都是基于原始聚合物。一个例外是聚合物发光电化学电池（LEC），其活性层是混合离子/电子导体（MIEC）。在工作过程中，LEC的MIEC在原位进行电化学掺杂，在不同掺杂区域之间形成发光的p-n或p-i-n结。由于掺杂，该LECs具有许多理想的器件特性。MIEC器件（如LECs）面临的主要挑战是它们较差的使用寿命和对底层物理缺乏理解。这在很大程度上是由于MIEC设备的复杂性，它拥有至少四种不同的电荷载流子可以相互作用。******在我们提出的研究中，各种聚合物MIEC器件将被深入探索和研究，以应对挑战。特别是，为了更好地理解MIEC结的电子结构，我们将对超大的冻结平面电池进行前所未有的协同扫描光电流、光致发光和吸收测量。此外，我们努力实现持久的MIEC设备准备为实际应用。提议的研究将建立在我的小组在MIEC发光电池和光伏电池方面的丰富经验的基础上，这些经验近年来在国际顶级期刊上发表了近30篇论文。我的小组还开发了一套强大的实验技术，非常适合研究MIEC设备。其中包括延时荧光成像、冷冻结和控制结松弛、电导率和电势的扫描电探测、协同扫描光电流和光致发光探测技术。拟议的研究为hqp的培训提供了极好的机会，将为他们从事学术研究或工业研发的职业生涯做好准备。**