High Efficiency Organic Solar Cells with Novel Transparent Electrodes

具有新型透明电极的高效有机太阳能电池（ECCS-0653722）北卡罗来纳州立大学（J. Narayan，PI）项目摘要本研究的主要目标是寻找用于有机太阳能电池的新型透明电极材料，替代目前用作透明电极的氧化铟锡。长期以来用作TCO（透明导电氧化物）的ITO由于成本高、供应有限、化学稳定性和扩散阻隔性能差而带来严重问题。智力优点：该提案提出了新型氧化钼（MoOx 掺杂 Mn）和氧化锌（ZnO 掺杂 Ga 或 Al）基材料作为 ITO 的替代品。鉴于其更高的功函数，MoOx(2 x3) 可能比 ZnO 基材料更好。拟议的研究有四个部分：（1）在玻璃和蓝宝石（0001）上合成和加工ZnO（掺杂Ga或Al）和MoOx（2 x3）薄膜，其中这些薄膜可以通过域匹配外延生长为外延单晶。晶粒尺寸和晶界性质将被系统地改变，以建立微观结构-电性能相关性； (2) 建立各种微观结构的电阻率与温度的关系，从无规多晶到纹理多晶，再到单晶； (3) 研究缺陷和界面的特性，并将这些信息与太阳能电池效率相关联； (4) 利用优化微结构和性能的 TCO 薄膜制造高效太阳能电池。 更广泛的影响：该提案包括培训研究生和本科生，以及与北卡罗来纳州农业与技术大学合作，吸引少数民族学生进入北卡罗来纳州立大学研究生课程。外展活动还将包括 ASM-International 为高中生举办的暑期学校。这些学生接触到新材料、分析工具、材料特性和建模的最新发展。 PI 通过远程教育网络教授一系列课程，来自 NC A&T 的学生可以参加课程并了解新型材料、加工、表征和建模以及器件制造方面的最新进展。

High Efficiency Organic Solar Cells with Novel Transparent Electrodes (ECCS-0653722)North Carolina State University (J. Narayan, PI)Project Summary The primary objective of this research is to find novel transparent electrode materials for organic solar cells, alternative to indium tin oxide which is used presently as a transparent electrode. The ITO, which has been used as TCO (transparent conducting oxide) for a long time, poses a serious problem due to its high cost, limited supply, and poor chemical stability and diffusion barrier properties. Intellectual Merit: This proposal addresses novel molybdenum oxide (MoOx doped with Mn) and zinc oxide (ZnO doped with Ga or Al) based materials as alternative to ITO. The MoOx( 2 x3) could be potentially better than ZnO-based materials in view of its higher work function. The proposed research has four components: (1) Synthesis and processing ZnO (doped with Ga or Al) and MoOx( 2 x3) films on glass, and sapphire (0001) where these films cab be grown as epitaxial single crystal via domain matching epitaxy. The grain size and the nature of grain boundaries will be varied systematically to establish microstructure-electrical property correlations; (2) Establish resistivity versus temperature correlations for various microstructures ranging from random poly, to textured poly, to single crystals; (3) Study the properties of defects and interfaces and correlate this information with solar cell efficiency; and (4) Fabricate high-efficiency solar cells utilizing TCO films of optimized microstructures and properties.Broader Impacts:The proposal includes training of graduate and undergraduate students and collaborations with NC A&T University to attract minority students into the graduate program at NCSU. The outreach will also involve ASM-International sponsored Summer School for rising High-School seniors. These students are exposed to recent developments in new materials, analysis tools, materials properties and modeling. The PI teaches a series of courses through distance-education network, where students from NC A&T can take courses and learn latest developments in novel materials, processing, characterization and modeling, and device fabrication.