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

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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.