Material development for high voltage and high efficiency of perovskite photovoltaic devices

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  • ペロブスカイト半導体の光電変換における高電圧・高効率化の材料開発
  • ペロブスカイト ハンドウタイ ノ コウデン ヘンカン ニ オケル コウデンアツ ・ コウコウリツカ ノ ザイリョウ カイハツ

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Abstract

<p>Photophysical properties of organic-inorganic metal halide perovskites as ionic crystals are reviewed, focusing on the defect tolerant nature in electronic structures and high open-circuit voltage (Voc) performance of photovoltaic cells in relation to suppression of trap-assisted charge recombination at interfaces of perovskite polycrystals. Voc is enhanced by passivating interfacial defects with ultrathin layers of inorganic and organic compounds. Inorganic nanosheets of Mxene work as passivators, simultaneously functioning as an electron transport layer for planar photovoltaic devices. Thermally stable all-inorganic perovskite devices that enable high Voc over 1.4 V have been developed with CsPbI2Br having a junction with an amorphous SnO2 layer as a passivator. The high Voc function enables the devices to operate in low illuminance indoor light for IoT applications. The device outputs more than 1.1 V even under 200 lx of LED illumination with the high conversion efficiency of 34 %.</p>

Journal

  • Oyo Buturi

    Oyo Buturi 90 (11), 662-669, 2021-11-01

    The Japan Society of Applied Physics

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