유-무기 금속 할라이드 반도체
Organic - Inorganic Metal Halide Semiconductor
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신현정 성균관대 Organic-inorganic hybrid metal halides are now emerging as new class of semiconductors. Known as ‘Perovskite Solar Cell (PSC)’, photovoltaic (PV) cells with MAPbI3(methylammoniumleadtriiodides),one of the notable examples of hybrid metal halides, as light absorbing materials showed a remarkable power conversion efficiency (PCE) of over 20%. The certified PCE is currently 25.2%. These halides are truly unique semiconducting materials showing excellent optoelectronic properties, even their preparation methods are simple spin coatings at relatively lower temperatures, resulting polycrystalline thin films. Unlike monocrystalline Si, GaAs, and other single crystalline semiconductors, these halides may contain lot of defects, which are potentially non-radiative recombination centers, for example, point defects, grain boundaries as well as interfacial defects including surfaces without any proper passivation. Defect tolerating in these halides is now under debating and thus defect engineering is the key to increase further the PCEs. In this talk, the unique semiconducting properties studied are summarized and recent experimental results to improve the efficiency and stability of PSCs. |