北京化工大学李韦伟团队报道了硫酸钒基空穴传输层制备高效有机太阳能电池。相关研究成果发表在2024年3月22日出版的国际学术期刊《中国化学》。

在常用的PEDOT:PSS之外开发替代空穴传输层（HTL）材料，以提高有机太阳能电池（OSCs）的寿命仍然是一项紧迫的任务。无机金属氧化物类材料，如NiOx、CoOx和VOx，具有合适的功函数，近年来引起了众多研究关注。

该文中，更丰富且易于获得的含氧盐，硫酸钒（VOSO₄）已被证明是OSCs的HTL的极好选择。基于VOSO₄的HTL可以通过前体溶液的旋涂，以及随后的热退火和UVO处理来容易地处理。因此，基于PM8:L8-BO的OSCs与基于VOSO₄的HTL可以实现18.72%的高功率转换效率(PCE)。高透射率、光滑的膜表面、合适的能级和高电导率有助于获得高OSCs性能。

更重要的是，与具有PEDOT:PSS的设备相比，基于VOSO₄的OSCs在储存于充满N₂的手套箱中时表现出更好的稳定性。在储存600小时后，基于VOSO₄的器件可以保持其初始效率的89%。值得注意的是，VOSO₄可在基于PM6:BTP-BO-4Cl和PM6:IT-4F的OSCs中用作通用HTL，分别产生17.87%和13.85%的高PCE。

附：英文原文

Title: Vanadyl Sulfate Based Hole-Transporting Layer Enables Efficient Organic Solar Cells

Author: Mengdi Li, Yuqing Sun, Yang Cheng, Chaowei Zhao, Jicai Zhang, Weiwei Li

Issue&Volume: 2024-03-22

Abstract: It remains an urgent task to develop alternative hole-transporting layer (HTL) materials beyond commonly used PEDOT:PSS to increase the shelf-life of organic solar cells (OSCs). Inorganic metal oxide type materials, such as NiOx, CoOx and VOx, with suitable work functions have attracted numerous research attention recently. In this work, more abundant and easily accessible oxygenated salt, vanadyl sulfate (VOSO4) has been demonstrated to be excellent choice as HTL for OSCs. The VOSO4-based HTL can be readily processed by spin-coating from the precursor solution with subsequent thermal annealing and UVO treatment. As a consequence, a high power conversion efficiency (PCE) of 18.72% can be achieved for PM8:L8-BO based OSCs with the VOSO4-based HTL. High transmittance, smooth film surface, suitable energy level and high conductivity were revealed to contribute to the high OSC performance. More importantly, compared to device with PEDOT:PSS, VOSO4-based OSCs exhibit improved stability when stored in the N2 filled glove box. After being stored for 600 h, VOSO4-based device can retain 89% of its initial efficiency. Notably, VOSO4 can be used as general HTL in PM6:BTP-BO-4Cl and PM6:IT-4F based OSCs, yielding high PCEs of 17.87% and 13.85%, respectively.

DOI: 10.1002/cjoc.202300789

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202300789