有机小分子晶态双连续互穿网络的制备

As the third generation photovoltaic cells, organic photovoltaic cells (OPVs) have rapidly developed in recent years. For the devices with a high power conversion efficiency (PCE) and a long-term stability, a bulk heterojunction with the crystalline bi-continuous interpenetrating network is necessary. Hence, many research works focus on understanding the formation mechanism of the structure and developing methods to control its morphology. In our prior work, we found the crystalline bi-continuous interpenetrating network in ZnPc:C60 bulk heterojunction fabricated by weak epitaxy growth (WEG) method and the photovoltaic cells with the structure displayed a higher PCE. Based on our prior work, this project will further research the effect of WEG and crystalline phase separation during the formation of crystalline bi-continuous interpenetrating network in typical small molecular OPVs system. Moreover, we also plan to discovery the main control factor to change the morphology and hope to provide some help to develop better performance OPVs by the project.

作为第三代光伏电池，有机光伏电池近年来发展十分迅速。研究表明，晶态双连续互穿网络结构的体异质结是提高器件能量转换效率和长期稳定性的核心之一。研究该结构的形成过程和发展对其形态的调控手段，一直是本领域的研究热点和核心。前期工作中我们发现，通过弱外延生长制备的酞菁锌:富勒烯(ZnPc:C60)体异质结薄膜中存在晶态双连续互穿网络结构，同时，拥有这种结构的器件具有更高的能量转换效率。本项目拟在此工作基础上，通过对有机小分子光伏电池中典型体系的研究，揭示弱外延生长和分相结晶在有机小分子形成晶态双连续互穿网络过程中的作用和普遍规律，发现和掌握调控有机小分子晶态双连续互穿网络形态变化的主要因素，为发展其他小分子体系的高性能有机光伏电池奠定理论基础和提供技术支持。