Laser processing of Li-doped mesoporous TiO 2 for ambient-processed mesoscopic perovskite solar cells
Laser processing of Li-doped mesoporous TiO 2 for ambient-processed mesoscopic perovskite solar cells
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激光加工Li掺杂介孔TiO 2 用于常温处理介观钙钛矿太阳能电池
DOI：
10.1039/d3tc03151a
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发表时间：
2024
影响因子：
6.4
通讯作者：
Mo H
中科院分区：
文献类型：
--
作者：
Mo H
介孔二氧化钛（m-TiO 2）在光催化、光电化学、能量储存和光伏应用中获得了显著的关注。然而，m-TiO 2基器件的性能往往受到其导电性差、电子迁移率低和电子陷阱密度高的阻碍。在m-TiO 2中掺杂碱金属元素是解决这些问题的一种很有前途的方法。在此，提出了一种超快激光处理来将锂（Li）掺杂引入m-TiO 2（Li掺杂m-TiO 2）中以增强其用于介观钙钛矿太阳能电池（PSC）的电荷传输能力。值得注意的是，与传统的炉内处理（500 ° C、60分钟）相比，激光处理在最高温度800-850 ° C下总共只需要42秒的照射即可制备Li掺杂m-TiO 2。因此，使用激光处理在高相对湿度（60-75%）下组装的PSC表现出19.15%的功率转换效率（PCE），高于炉内处理的18.10%。这种改善是由于Li掺杂的m-TiO 2纳米颗粒之间的增强的互连、减少的氧空位以及由激光处理引起的m-TiO 2/钙钛矿处的改善的界面接触。这些因素有助于提高电子传输能力，减少电荷复合，并抑制在PSC的滞后行为。本文介绍的超快激光处理为快速制造用于PSC和其他相关应用的金属掺杂m-TiO 2材料提供了一条新途径。
Mesoporous titanium dioxide (m-TiO2) has gained significant attention in photocatalytic, photoelectrochemical, energy storage, and photovoltaic applications. However, the performance of m-TiO2-based devices is often hindered by their poor electrical conductivity, low electron mobility, and high electronic trap density. Doping m-TiO2 with alkali-metal elements is a promising method to tackle these issues. Herein, an ultrafast laser treatment is presented to introduce lithium (Li) doping into m-TiO2 (Li-doped m-TiO2) to enhance its charge transport ability for mesoscopic perovskite solar cells (PSCs). Remarkably, the laser treatment only needs 42 s irradiation in total at the highest temperature of 800–850 °C to prepare the Li-doped m-TiO2, compared to the traditional furnace treatment at a temperature of 500 °C for 60 min. Consequently, PSCs assembled under high relative humidity (60–75%) using the laser treatment exhibited a power conversion efficiency (PCE) of 19.15%, higher than that of the furnace treatment of 18.10%. The improvement is due to the enhanced interconnection between the Li-doped m-TiO2 nanoparticles, reduced oxygen vacancies, and improved interfacial contact at m-TiO2/perovskite, resulting from the laser treatment. These factors contribute to an improved electron transport capability, reduced charge recombination, and suppressed hysteresis behaviour in the PSCs. The ultrafast laser treatment introduced here offers a novel path for rapid manufacturing of metal-doped m-TiO2 materials for PSCs and other related applications.