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首页> 外文期刊>RSC Advances >TiO2 nanorod arrays hydrothermally grown on MgO-coated compact TiO2 for efficient perovskite solar cells
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TiO2 nanorod arrays hydrothermally grown on MgO-coated compact TiO2 for efficient perovskite solar cells

机译：TiO 2 纳米棒阵列在MgO包覆的致密TiO 2 上水热生长，用于高效钙钛矿太阳能电池

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The morphology of electron transport layers has a significant impact on the device architecture and electronic processes of mesoscopic perovskite solar cells (PSCs). In this study, ultrathin MgO is coated on the surface of compact TiO2 (c-TiO2). The MgO-coated c-TiO2 is first used as seeds to hydrothermally grow one-dimensional (1D) TiO2 nanorod (NR) arrays for PSC devices. Rutile nanorod arrays are fabricated via a facile solvothermal method using tetrabutyl titanate (TBT) as the Ti precursor. The microstructures and morphologies, including nanorod diameter, length, and areal density, of the TiO2 NR arrays are varied by controlling the concentration of TBT from 0.3 M to 0.7 M. Furthermore, the profound effects of the MgO modification and titania nanorod morphology on the pore-filling of perovskite CH3NH3PbI3, charge separation and recombination at the perovskite/titania nanorod interface are investigated. Our results reveal that the Ti precursor concentration strongly affects the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF) of the 1D TiO2 NR array-based device. Under optimized conditions with MgO coating and at 0.4 M TBT, our champion cell with 1D TiO2 NRs demonstrates a power conversion efficiency (PCE) of 17.03% with JSC = 22.01 mA cm?2, VOC = 1.06 V, and FF = 0.73. Under the same fabrication conditions, MgO modification enhances the average PCE to 16.24% for the PSCs with the MgO coating from 13.38% for the PSCs without the MgO coating. The devices show an approximately 18% improvement in performance, which mainly results from the open-circuit voltage and fill factor enhancements. Moreover, advantageously, the MgO modification is found to reduce the current density–voltage (J–V) hysteresis with respect to the scan direction and improve the UV stability of the non-encapsulated cells. Therefore, this study presents a promising approach to fabricate efficient and stable one-dimensional TiO2 nanorod array-based perovskite solar cells.
机译：电子传输层的形态对介观钙钛矿太阳能电池（PSC）的器件结构和电子工艺有重大影响。在这项研究中，超薄MgO涂覆在致密的TiO 2 （c-TiO 2 ）表面。首先，将MgO包覆的c-TiO 2 用作种子，以水热生长一维（一维）TiO 2 2 NR阵列的微观结构和形貌，包括纳米棒直径，长度和面密度，是通过将TBT的浓度控制在0.3 M至0.7 M来改变的。此外，MgO改性和二氧化钛纳米棒形态对钙钛矿CH 3 NH 3 的孔填充的深远影响small> PbI 3 ，研究了钙钛矿/二氧化钛纳米棒界面的电荷分离和复合。我们的结果表明，Ti前驱体浓度强烈影响开路电压（ V OC ），短路电流密度（ J SC ）和一维TiO 2 NR阵列的填充因子（FF）-基于设备。在具有MgO涂层和0.4 M TBT的最佳条件下，具有1D TiO 2 NR的冠军电池在 J下的功率转换效率（PCE）为17.03％ SC = 22.01 mA cm ？2 ， V OC = 1.06 V，FF = 0.73。在相同的制造条件下，MgO改性将带有MgO涂层的PSC的平均PCE从没有MgO涂层的PSC的13.38％提高到16.24％。该器件的性能大约提高了18％，这主要是由于开路电压和填充系数的提高。此外，有利的是，发现MgO改性可降低相对于扫描方向的电流密度-电压（ J – V ）滞后现象，并提高非金属氧化物的紫外稳定性。 -封装的细胞。因此，本研究提供了一种有前途的制备高效，稳定的一维TiO 2 纳米棒阵列钙钛矿型太阳能电池的方法。

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