Photogeneration, recombination and extraction of charge carriers in organic solar cells

有机太阳能电池中载流子的光发生、重组和提取

• 批准号: 167900125
• 负责人: Dr. Denis Andrienko
• 金额: --
• 依托单位: Max-Planck-Institut für Polymerforschung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2011-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/167900125?language=en
• 关键词: Photogeneration; recombination; extraction; charge; carriers

A significant progress has recently been made in understanding and optimizing organic bulk heterojunction solar cells. The photocurrent and its major contributions from polaron pair dissociation and charge extraction, however, remained evasive from both, experimental and theoretical perspective. For instance, the widely used model to describe polaron pair dissociation, the Braun– Onsager model, has been shown theoretically and experimentally to not grasp the temperature and field dependence completely or correctly. Within this proposal, we attempt to marry systematic experiments with parameter-free multiscalesimulations in order to determine the factors influencing the photocurrent and its contributions.We plan to experimentally investigate mechanisms of the photocurrent generation, look at contributions of charge extraction and polaron pair dissociation, study field, temperature, and acceptor strength dependencies. The sample morphology will be studied as well. The active materials to be applied are the P3HT:PCBM reference system as well as a very promising alternative donor, PCPDTBT, and fullerene derivatives with a variation of the acceptor strength. At the same time parameter-free simulations will be performed in order to adapt the Braun–Onsager model as well as to understand whether the key parameters can be deduced from simulations.The goal will therefore be to combine theoretical and experimental findings with the aim of a quantitative description of the photocurrent, and finally, formulation of appropriate structure-propertyprocessing relationships

有机体异质结太阳能电池的研究和优化取得了重大进展。然而，从实验和理论的角度来看，光电流及其来自极化子对解离和电荷提取的主要贡献仍然是回避的。例如，广泛使用的描述极化子对解离的模型，Braun-Onsager模型，已经在理论和实验上被证明不能完全或正确地掌握温度和场的依赖性。 在这个建议中，我们试图结婚系统的实验与参数无关的multiscale simulations，以确定影响的因素，光电流及其contributions.We计划实验研究的光电流产生的机制，看看贡献的电荷提取和极化子对解离，研究领域，温度和受体强度的依赖关系。还将研究样品形态。要应用的活性材料是P3 HT：PCBM参考系统以及一个非常有前途的替代供体，PCPDTBT，和富勒烯衍生物的受体强度的变化。与此同时，为了适应Braun-Onsager模型，以及了解关键参数是否可以从模拟中推导出来，我们将进行无参数模拟，因此目标是将联合收割机的理论和实验结果结合起来，以定量描述光电流，并最终制定适当的结构-性能-加工关系