瑞士洛桑联邦理工学院Grtzel Michael团队报道了羟肟酸预吸附可提高共敏太阳能电池的效率。相关研究成果于2022年10月26日发表在《自然》。

染料敏化太阳能电池（DSCs）使用吸附在纳米晶介孔二氧化钛（TiO₂）薄膜表面的光敏剂，以及电解质或固体电荷传输材料将光转化为电。它们具有许多特性，包括透明、多色和低成本制造，并被用在玻璃幕墙、天窗和温室中。敏化剂、氧化还原介质和器件结构的最新发展提高了DSCs的性能，尤其是在环境光条件下。为了进一步提高其效率，控制有利于电荷生成的TiO₂表面上染料分子的组装至关重要。

该文中，研究人员报告了一种在TiO₂表面预吸附一层羟肟酸衍生物的路线，以改善两种新设计的共吸附敏化剂的染料分子填充和光伏性能，这两种敏化剂可在整个可见光域定量收集光。性能最佳的共敏化太阳能电池在标准空气质量1.5全球模拟阳光下，显示出15.2%的功率转换效率（PCE）（独立确认为15.2%），并显示出长期运行稳定性（500小时）。具有2.8cm²的更大活性面积的器件在宽范围的环境光强度下，表现出28.4%至30.2%的PCE以及高稳定性。研究结果为易于获得高性能DSCs铺平了道路，并为使用环境光作为能源的低功耗电子设备的电源和电池更换等应用提供了广阔的前景。

附：英文原文

Title: Hydroxamic acid preadsorption raises efficiency of cosensitized solar cells

Author: Ren, Yameng, Zhang, Dan, Suo, Jiajia, Cao, Yiming, Eickemeyer, Felix T., Vlachopoulos, Nick, Zakeeruddin, Shaik M., Hagfeldt, Anders, Grtzel, Michael

Issue&Volume: 2022-10-26

Abstract: Dye-sensitized solar cells (DSCs) convert light into electricity using photosensitizers adsorbed on the surface of nanocrystalline mesoporous titanium dioxide (TiO2) films along with electrolytes or solid charge-transport materials1-3. They possess many features including transparency, multicolor and low-cost fabrication, and are being deployed in glass facades, skylights and greenhouses4. Recent development of sensitizers5-10, redox mediators11-13 and device structures14 has improved the performance of DSCs, particularly under ambient light conditions14-17. To further enhance its efficiency, it is pivotal to control the assembly of dye molecules on the surface of TiO2 that favors charge generation. Here, we report a route of pre-adsorbing a monolayer of a hydroxamic acid derivative on the surface of TiO2 to improve the dye molecular packing and photovoltaic performance of two newly-designed co-adsorbed sensitizers that harvests light quantitatively across the entire visible domain. The best performing cosensitized solar cells exhibited a power conversion efficiency (PCE) of 15.2% (independently confirmed 15.2%) under standard air mass 1.5 global simulated sunlight, and showed long-term operational stability (500 hours). Devices with a larger active area of 2.8 cm2 exhibited PCE of 28.4 % to 30.2 % over a wide range of ambient light intensities along with high stability. Our findings pave the way for facile access to high performance DSCs and offer promising prospects for applications as power supply and battery replacement for low-power electronic devices18-20 that use ambient light as their energy source.

DOI: 10.1038/s41586-022-05460-z

Source: https://www.nature.com/articles/s41586-022-05460-z