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MoS2 / TiO2 nanoparticle composite bulk heterojunction solar cell

机译:MOS2 / TiO2纳米粒子复合体散差太阳能电池

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We investigate hybrid bulk heterojunction (BHJ) solar cell employing layered transition-metal-dichalcogenide molybdenum disulfide (MoS2) as photon harvesting layer with titanium dioxide (TiO2) as electron acceptor and poly 3-hexylthiophene (P3HT) as hole conductor. Micro-Raman spectroscopic measurement confirms that MoS2 coated on porous TiO2 film consist nanoflakes of monolayer/few layers in the stack. The semiconducting anatase phase of TiO2 is confirmed by a signature peak at 146 cm−1, with two other peaks at 383 cm−1 and 407 cm−1 corresponding to MoS2 in the film. The BHJ solar cell having a stacked structure of ITO/TiO2/MoS2/P3HT/Au showed a short circuit current density of 4.7 mA/cm2, open circuit voltage of 560 mV, and photoconversion efficiency of 1.3% under an illumination of 100 mW/cm2. The external quantum efficiency of the BHJ solar cell confirms that MoS2 nanoflakes absorb solar photons in a wavelength range of 350 nm ∼ 800 nm. Dark current-voltage characteristics of the BHJ solar cell under low and medium forward bias regions suggest that electron recombination at TiO2/MoS2/P3HT interfaces limits photovoltaic performance of the device.
机译:我们研究了用分层过渡 - 金属 - 二甲基化物钼二硫化物(MOS2)作为光子收割层作为电子受体和聚3-己基噻吩(P3HT)作为孔导体的光子收割层。微拉曼光谱测量证实,涂覆在多孔TiO 2膜上的MOS2包括堆叠中单层/几层的纳米薄片。通过146cm -1 / sop>的签名峰确认TiO 2的半导体锐钛矿相,在383cm -1 -1 / sop>和407cm -1 对应于薄膜中的MOS2。具有ITO / TiO2 / MOS2 / P3HT / AU堆叠结构的BHJ太阳能电池显示出4.7mA / cm 2 ,开路电压为560mV的短路电流密度,光电转换效率为1.3 %在100mW / cm 2 的照明下。 BHJ太阳能电池的外部量子效率证实MOS2纳米薄片在350nm〜800nm的波长范围内吸收太阳能光子。低频和中向偏置区域下的BHJ太阳能电池的暗电流 - 电压特性表明TiO2 / MOS2 / P3HT接口的电子复合限制了装置的光伏性能。

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