Optically Detected Magnetic Resonance Imaging of Direct Band-Gap Solar Cell Materials

在本研究计画中，我们将发展两种互补的技术来研究具有直接带隙的半导体材料。这将导致对限制太阳能电池材料效率的过程的更好理解，并且从长远来看，可能有助于开发具有更高效率的更好的太阳能电池。这些技术基于磁共振（电子自旋和核自旋磁共振），但使用光学泵浦来增强自旋极化，使用光学检测来增加灵敏度并允许空间定位。该项目的基本技术是在双方的实验室中建立的。在本项目中，将根据计划的测量对其进行扩展和调整。为了实现空间定位，我们将使用两种互补的方法：光学显微镜与独立的光束路径的激励和检测和空间编码通过拉莫尔频率的脉冲磁场梯度的基础上。我们设想，该项目将有助于实现经济和环保设备的长期目标，以尽可能高的效率收集太阳能。

In this research project, we will develop two complementary techniques for studying semiconductor materials with direct band gaps. This will lead to an improved understanding of processes that limit the efficiency of solar cell materials and may, in the long run, contribute to the development of better solar cells with higher efficiency. The techniques are based on magnetic resonance (electron-spin and nuclear-spin magnetic resonance) but use optical pumping for enhancing the spin polarization and optical detection for increasing the sensitivity and allow spatial localization. The basic techniques for this project are established in the laboratories of both partners. For the present project, they will be extended and adapted for the planned measurements. To achieve spatial localization, we will use two complementary approaches: optical microscopy with independent beam paths for excitation and detection and spatial encoding via the Larmor frequency on the basis of pulsed magnetic field gradients. We envision that this project will contribute towards the long-term goal of economical and eco-friendly devices that harvest solar energy at the highest possible efficiency.