Cui Xinyue, Xie Guanshui, Liu Yuqiang, Xie Xianqiang, Zhang Huarui, Li Hongxiang, Cheng Pei, Lu Guanghao, Qiu Longbin, Bo Zhishan
College of Textiles and Clothing, State Key Laboratory of Bio-fibers and Eco-textiles, Qingdao University, Qingdao, 266071, China.
Shenzhen Key Laboratory of Intelligent Robotics and Flexible Manufacturing Systems, Department of Mechanical and Energy Engineering, SUSTech Energy Institute for Carbon Neutrality, Southern University of Science and Technology, Shenzhen, 518055, China.
Adv Mater. 2024 Nov;36(45):e2408646. doi: 10.1002/adma.202408646. Epub 2024 Sep 18.
The compatibility of perovskite and organic photovoltaic materials in solution processing provides a significant advantage in the fabrication of high-efficiency perovskite/organic tandem solar cells. However, additional recombination losses can occur during exciton dissociation in organic materials, leading to energy losses in the near-infrared region of tandem devices. Consequently, a ternary organic rear subcell is designed containing two narrow-bandgap non-fullerene acceptors to enhance the absorption of near-infrared light. Simultaneously, a unique diffusion-controlled growth technique is adopted to optimize the morphology of the ternary active layer, thereby improving exciton dissociation efficiency. This innovation not only broadens the absorption range of near-infrared light but also facilitates the generation and effective dissociation of excitons. Owing to these technological improvements, the power conversion efficiency (PCE) of organic solar cells increased to 19.2%. Furthermore, a wide-bandgap perovskite front subcell is integrated with a narrow-bandgap organic rear subcell to develop a perovskite/organic tandem solar cell. Owing to the reduction in near-infrared energy loss, the PCE of this tandem device significantly improved, reaching 24.5%.
钙钛矿与有机光伏材料在溶液加工中的兼容性为高效钙钛矿/有机串联太阳能电池的制造提供了显著优势。然而，在有机材料中的激子解离过程中可能会发生额外的复合损失，导致串联器件近红外区域的能量损失。因此，设计了一种包含两种窄带隙非富勒烯受体的三元有机背子电池，以增强近红外光的吸收。同时，采用独特的扩散控制生长技术来优化三元活性层的形貌，从而提高激子解离效率。这一创新不仅拓宽了近红外光的吸收范围，还促进了激子的产生和有效解离。由于这些技术改进，有机太阳能电池的功率转换效率（PCE）提高到了19.2%。此外，可以将宽带隙钙钛矿前子电池与窄带隙有机背子电池集成，以开发钙钛矿/有机串联太阳能电池。由于近红外能量损失的减少，这种串联器件的PCE显著提高，达到了24.5%。
