论文标题
可视化有机光伏中的垂直能量景观
Visualising the Vertical Energetic Landscape in Organic Photovoltaics
论文作者
论文摘要
有机电子设备中的能级图在设备性能和设备物理的解释中起着至关重要的作用。在有机太阳能电池的情况下，使用在单个混合组件上测量的能量值估算供体的光伏间隙的常规方法已成为常规，从而与设备的相应开路电压达成不当一致。为了解决这个问题，我们开发了一种方法，该方法可以直接可视化混合物中的垂直能量景观，该方法通过将紫外光发射光谱和氩气簇蚀刻而获得。我们研究了模型和高性能光伏系统，并证明所得的光伏间隙与所测量的CT能和开路电压密切一致。此外，我们表明，这种方法使我们能够在环境退化时研究能量景观的演变，这对于理解降解机制和缓解策略的发展至关重要。
Energy level diagrams in organic electronic devices play a crucial role in device performance and interpretation of device physics. In the case of organic solar cells, it has become routine to estimate the photovoltaic gap of the donor:acceptor blend using the energy values measured on the individual blend components, resulting in a poor agreement with the corresponding open-circuit voltage of the device. To address this issue, we developed a method that allows a direct visualisation of the vertical energetic landscape in the blend, obtained by combining ultraviolet photoemission spectroscopy and argon cluster etching. We investigate both model and high-performance photovoltaic systems and demonstrate that the resulting photovoltaic gaps are in close agreement with the measured CT energies and open-circuit voltages. Furthermore, we show that this method allows us to study the evolution of the energetic landscape upon environmental degradation, critically important for understanding degradation mechanisms and development of mitigation strategies.
